Installation and Operations Manual INVOLAR MAC250 Photovoltaic

Installation and Operations Manual INVOLAR MAC250 Photovoltaic
Installation and Operations Manual
INVOLAR MAC250 Photovoltaic Micro-Inverter
Model number MAC250A-240-NA.
This manual is an integral part of the unit. Please read the instruction manual carefully
before installation, operation or maintenance. Keep this instruction manual for future
reference.
Version 1.2 INVOLAR Corporation Ltd.
AUG. 2011
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Contact Information
INVOLAR Corporation Ltd.
Room 407, Building 84, No. 887, Zuchongzhi Road, Pudong
District,
201203 Shanghai, PEOPLE’S REPUBLIC OF CHINA
Tel: 86-21-50272208
Fax: 86-21-50277705
www.INVOLAR.com
info@INVOLAR.com
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Table of Contents
1
READ THIS FIRST ........................................................................................................................ 4
2
SAFETY SYMBOLS....................................................................................................................... 5
3
SAFETY INSTRUCTIONS AND EC DIRECTIVES .............................................................................. 9
3.1
4
5
6.
EC DIRECTIVES ..................................................................................................................... 15
THE INVOLAR MICRO-INVERTER SYSTEM INSTRUCTION .......................................................... 24
4.1
THE INVOLAR MICRO-INVERTER SYSTEM .................................................................................. 24
4.2
THE INVOLAR MAC250 MICRO-INVERTER ............................................................................... 25
4.3
FEATURES ........................................................................................................................... 25
INVOLAR MICRO-INVERTER INSTALLATION ............................................................................. 26
5.1
INVOLAR MAC250 MICRO-INVERTER OPERATIONAL ENVIRONMENT .............................................. 28
5.2
INVOLAR MAC250 MICRO-INVERTER OPERATIONAL CONDITION IN PV SYSTEM ................................ 28
5.3
INSTALLATION STEPS ............................................................................................................. 28
FUNCTION INSTRUCTIONS ....................................................................................................... 35
6.1
WORKING MODE ................................................................................................................. 35
6.2
GRID CONNECTION ............................................................................................................... 36
6.3
GRID DISCONNECT ................................................................................................................ 36
START-UP CHECKS ............................................................................................................................ 37
7
DISCONNECTING A MICRO-INVERTER FROM THE PV MODULE ................................................ 38
8
MONITORING AND TROUBLESHOOTING AND MAINTENANCE ................................................. 39
SAFETY CHECKS ................................................................................................................................. 39
MAINTAIN PERIODICALLY .................................................................................................................... 39
9
10
8.1
OVERVIEW .......................................................................................................................... 40
8.2
MAC250 MICRO-INVERTER STATUS LED INDICATIONS AND ERROR REPORTING ............................. 40
INTERNET WEB ................................................................................................................... 43
9.1
USER REGISTRATION.............................................................................................................. 43
9.2
USER LOGIN ........................................................................................................................ 43
INVOLAR MAC250 MICRO-INVERTER TECHNICAL DATA ........................................................... 44
10.1
11
TECHNICAL SPECIFICATIONS ..................................................................................................... 44
APPENDIX ................................................................................................................................ 46
11.1
LIMITED WARRANTY.............................................................................................................. 46
11.2
INVOLAR MAC250 MICRO-INVERTER SYSTEM SAMPLE WIRING DIAGRAM ...................................... 47
11.3
EC DECLARATION OF CONFORMITY ........................................................................................... 48
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IMPORTANT SAFETY
INSTRUCTIONS
SAVE THESE INSTRUCTIONS
1 Read This First
Thank you for using INVOLAR MAC250A-240-NA Micro-Inverter. This Micro-Inverter with a
revolutionary technology maximizes the energy conversion from photovoltaic solar modules,
enhanced system reliability, and greatly simplifies the installation and reduces the maintenance
time and cost.
To reduce the risk of electrical shock, and to ensure the safe installation and operation of the
INVOLAR MAC250 Micro-Inverter, please read this manual carefully and pay attention to the
safety symbols appear throughout this document.
This manual is for end users.
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2 Safety Symbols
Warnings and cautions tell you about the dangerous conditions that may occur
if you do not follow all instructions in this manual.
Please read following safety symbols which indicate dangerous conditions and
important safety instruction.
DANGER
The DANGER symbols in this manual and on MAC250 Micro-inverters
indicate a hazard with a high level of risk which if not avoided,
will result in death or serious injury.
WARNING
The WARNING symbols in this manual and on MAC250 Micro-inverters
indicate a hazard with a medium level of risk which if not
avoided, could result in death or serious injury.
CAUTION
The CAUTION symbols in this manual and on MAC250 Micro-inverters
indicate a hazard with a low level of risk which if not avoided,
could result in minor or moderate injury.
NOTE
The NOTE symbols in this manual indicate important product information.
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Symbols replace words on the equipment, on a display, or in manuals.
Trademark
No access for unauthorized personnel
Caution, risk of danger
Symbol for the marking of electrical and
electronics devices according to Directive
2002/96/EC. Indicates that the device,
accessories and the packaging must not be
disposed as unsorted municipal waste and
must be collected separately at the end of the
usage. Please follow local ordinances or
regulations for disposal or contact an
authorized representative of the manufacturer
for
information
concerning
the
decommissioning of equipment.
Direct current
Alternating current
Protective conductor
Earth (ground) TERMINAL
Protective Conductor Terminal
Fuse
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Refer to the operating instructions
Caution, risk of electric shock
Caution, hot surface temperature
Isc PV
OVC
Vmax PV
PV
RISK OF ELECTRIC SHOCK! Energy storage
timed
Discharge: 45 minutes! Hazardous voltage
present for up to 45 minutes after
disconnection from power supply.
Maximum short circuit current (DC) value
which the inverter is rated. This rating of the
PCE refers to the absolute maximum current
the PV input of the solar inverter is designed
for under conditions of expected use.
Over voltage category (OVC) Designated
category to which the inverter voltage is
deemed suitably safe.
Maximum rated (DC) input voltage value which
the inverter is rated. This rating of the PCE
refers to the absolute maximum voltage the
PV input of the solar inverter is designed for
under conditions of expected use.
CE mark is attached to the solar inverter to
verify that the unit follows the provisions of
the European Low Voltage and EMC Directives
Photovoltaic
DC terminal, indicating the polarity of the
connections, positive,all positive connections
shall be marked with Red insulated wire.
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PCS
Service Personnel
Qualified Competent Personnel
DVC
Closed Electrical Operating Area
DC terminal, indicating the polarity of the
connections, negative, all negative
connections shall be marked with black
insulated wires.
Power conversion equipment, hereby is our
DC/AC inverter
A person having appropriate technical training
and experience necessary to be aware of
hazards to which that person may be exposed
in performing a task and of measures to
minimize the
risks to that person or other persons
Person adequately advised or supervised by an
electrically skilled person to enable him or her
to perceive risks and to avoid hazards which
electricity can create. For the purpose of the
safety information of this manual, a "qualified
person" is someone who is familiar with
requirements for safety, refrigeration system
and EMC and is authorized to energize,
ground, and tag equipment, systems, and
circuits in accordance with established safety
procedures.
The Involar inverter system may only be
commissioned and operated by competent
personnel.
Decisive voltage class
Room or location for electrical equipment to which
access is restricted to skilled or instructed
persons by the opening of a door or the removal of a
barrier by the use of a key or tool and
which is clearly marked by appropriate warning
signs
Technical Competence
The procedures described in this manual should be
performed by trained competent personnel only.
Maintenance should only be undertaken by competent
individuals who have a general knowledge of and
experience with devices of this nature. No repairs
should ever be undertaken or attempted by anyone
not having such competency.
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Compliance with safety regulations depends upon installing and configuring system correctly,
including using the specified wirings. The system must be installed only by professional
assemblers who are familiar with requirements for safety, Photovoltaic system and EMC. The
assembler is responsible for ensuring that the end system complies with all the relevant laws
in the country where it is to be used.
Involar requires using only genuine replacement parts, manufactured or sold by Involar.
Read completely through each step in every procedure before starting the procedure; any
exceptions may result in a failure to properly and safely complete the attempted procedure.
The individual sub-assembly of the system shall be interconnected by means of the wiring
methods outlined in national/international regulations but not limited to the BS7671
Requirements/ VDE regulation 0107.
All electrical installations must be made in accordance with the National Electrical
regulations, and any other codes and regulations applicable to the installation site.
Servicing of this product in accordance with this manual should never be undertaken in the
absence of proper tools, test equipment and the most recent revision to this manual which
is clearly and thoroughly understood.
3 Safety Instructions and EC Directives
This chapter contains the safety instructions which you must follow when installing,
operating and servicing the unit. If ignored, physical injury or death may follow, or damage
may occur to the unit. Read the safety instructions before you commence work on the unit.
If you are unable to understand the Dangers, Warnings, Cautions or Instructions, contact
the manufacturer or an authorized service dealer before installing, operating and servicing
the unit.
For INVOLAR Micro-Inverter Warranty Terms and Conditions, see the appendix of this manual.

SAVE THESE INSTRUCTIONS- This manual contains important instructions for the
MAC250 that shall be followed during installation and maintenance.

Be aware that only competent personnel should install and /or replace INVOLAR
Micro-Inverters.

Perform all electrical installations in accordance with all local electrical codes.

Compliance with the rules of correct use of tools and personal protective equipment
(PPE) ensuring a safe installation.

The inverter can still be charged with a hazardous voltage after being disconnected
from the supply. Allow a 45 minute discharge period before working on the inverter.

Be aware that only competent personnel should maintain INVOLAR Micro-Inverter.

Connect the INVOLAR Micro-Inverter to the electrical utility grid only after receiving prior
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approval from the utility company.

During the day time, use opaque covering on PV array to screen the sunshine before
installing the INVOLAR Micro-Inverter, thus eliminating the risk of electric shock to
persons working on the system.

The photovoltaic micro-inverter is not intended to be secured to the back of the
photovoltaic module. It should be secured to the framework supporting the PV module.

MAC250 is intended to be connected only to a dedicated branch circuit.

The device is not provided with ground-fault detector/interrupter unit.
WARNING
Always Disconnect the unit from the MAINS and PV supply by the
external customer installed disconnecting devices before installation,
servicing and maintenance works, and placed a warning sign adjacent
to switch “do not turn on maintenance in progress”.
WARNING
PV arrays become energized when exposed to light. Use safe working
practices when working on PV arrays as both AC and DC can be
present.
CAUTION!
The device is intended for fixed installation. Located on a part that is
not removable without shutdown to the operation of the unit.
WARNING
Risk of electric shock, Do not open cover. No user serviceable parts
inside. Servicing limited to competent service personnel.
WARNING
Do not use fuses which are not approved by the manufacturer. They
should be of same type and rating value as specified
Only competent persons should replace the fuse.
AC fuse (F2,F3)
Littelfuse
215; AC 250V, T2AH, 5×20mm, rated
breaking capacity: 1500A
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WARNING
Risk of electric shock – Both A.C. and D.C. voltage sources are
terminated inside this device. Each circuit must be individually
disconnected before servicing.
WARNING
Hot surfaces – To reduce the risk of burns – Do not touch device
surface when the device is running.
Allow 30 minutes cooling down period after switch off before
handling the device.
WARNING
Risk of electric shock from energy stored in capacitor! Do not remove
cover until 45 minutes after disconnecting all sources of supply.
WARNING
The printed circuit boards contain components sensitive to
electrostatic discharge. Wear a grounding wrist band when handling
the boards. Do not touch the boards unnecessarily.
WARNING
Do not operate device if found to be damaged or lacking parts.
WARNING
Before installing the unit, obtain approval from the utility company.
WARNING
Ensure adequate spacing distances between the unit and other
equipment or structures. Ensure that air can pass freely around the
unit for heat dissipation and maintenance accessibility.
DANGER
This photovoltaic micro-inverter is only for use in a
closed electrical operating area! The device shall not
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be energized during installation or maintenance!
An internal isolation transformer is provided in the micro-inverter, internal
transformer is galvanic isolation from the MAINS and PV array by reinforced
insulation. PV input circuit is earthed, and non-earthed pole of PV input keeps basic
insulation isolation from earthed metal.
In accordance to EN 62109-1:2010, circuits complying with the requirements for
DVC-A are considered safe to touch, however, since the device is intended for
outdoor use and Vmax PV is rated 50V D.C, which exceeds maximum 35V DC limit for
DVC-A in WET LOCATION as below:
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Summary of the limits of the decisive voltage classes
The inverter and PV array are restricted for use in a CLOSED ELECTRICAL OPERATING AREA!
WARNING:
The grid connected inverter is intended to be used with
appropriate PV generator, switch gear, SPDs, distribution
board, electrical protection components and other
device to form complete end systems. Compliance with
safety regulations depends upon installing and
configuring inverter correctly, including using the
specified emergency stop device adjacent to solar
inverter. The unit must be installed only by professional
assemblers who are familiar with requirements for safety
and EMC. The assembler is responsible for ensuring that
the end product or system complies with all the relevant
laws in the country where it is to be used.
WARNING:
Fire hazard. Suitable for mounting on concrete or other
non-combustible surface only.
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WARNING:
Be aware that the input DC voltage of the INVOLAR
Micro-Inverter shall not exceed 50V, higher voltage may
cause permanent damage to the device; it contains no
user serviceable and INVOLAR-Micro-Inverter Warranty
parts.
WARNING:
This unit is not provided with a GFDI device. The
inverter must be fitted with an external device as
required by the Article 690 of the National Electrical
Code for the Installation location.
WARNING:
The device is not provided with automatic disconnecting
means – this device shall be provided with external
relaying protection in accordance with local codes and
local utility requirements.
CAUTION:
SAVE THESE INSTRUCTIONS– This manual contains
important instructions for Model MAC250 that shall be
followed during installation and maintenance of the
photovoltaic micro-inverter.
WARNING:
To reduce the risk of fire, do not connect to an ac load
centre (circuit breaker panel) having multi-wire branch
circuits connected
CAUTION:
To reduce the risk of fire, connect only to a circuit
provided with 16 amperes maximum branch-circuit over
current protection in accordance with local codes and
local utility requirements.
CAUTION:
Final circuit over current protection of the AC circuit
shall be provided by others and should be suitable for
system design.
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3.1 EC Directives
This chapter follows the requirements of the European Low Voltage Directives,
contains the safety instructions and conditions of acceptability for the endues system,
which you must follow when installing, operating and servicing the unit. If ignored,
physical injury or death may follow, or damage may occur to the unit. Read these
instructions before you work on the unit. If you are unable to understand the
Dangers, Warnings, Cautions or Instructions, contact the manufacturer or an
authorized service dealer before installing, operating and servicing the unit.
The Grid Connected Inverter meets the requirements stipulated in Low Voltage
Directive (LVD) 2006/95/EC and Electromagnetic Compatibility (EMC) Directive
2004/108/EC. The unit is tested based on:
EN 62109-1:2010;
EN 61000-6-1;
EN61000-6-2;
EN61000-6-3;
G83-1;
EN50438;
VDE0126-1-1:2006.
When installing the PV system, start up of the unit (i.e. start of designated operation)
is prohibited until it is determined that the full system meets the requirements
stipulated in the EC Directive (2006/95/EC, 2004/108/EC etc).
The grid connected Inverter leaves the factory completely connecting device and
ready for connection to the mains and PV supply. The unit shall be installed in
accordance with national wiring regulations. Compliance with safety regulations
depends upon installing and configuring system correctly, including using the
specified wirings. The system must be installed only by competent assemblers who
are familiar with requirements for safety and EMC. The assembler is responsible for
ensuring that the end system complies with all the relevant laws in the country
where it is to be used.
The individual subassembly of the system shall be interconnected by means of the
wiring methods outlined in national/international regulations but not limited to the
BS7671 Requirements/ VDE regulation 0107.
WARNINGS
The device is not provided with ground-fault detector/interrupter
unit.
WARNINGS
The device is not provided with automatic disconnecting means –
this device shall be provided with external relaying protection in
accordance with local codes and local utility requirements.
[Use Condition]
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1. Over voltage category: over voltage category III for MAINS connection, over
voltage category II for PV supply according to IEC/EN 60664-1.
2. Pollution degree: Pollution degree III, not intended for heavy pollution of the air
by dust, smoke, corrosive or radioactive particles, vapors or salt.
3. Class of protection: I.
4. Protection against ingress of water: IP65
WARNINGS
The Degree of protection rating IP65 to IEC 60529 is applicable to the
device when the supplied installation connectors are inserted
correctly, and suitable external cord was fitted. If the unit is not
connected in this way, hazardous live parts may be exposed and the
IP Rating of the unit will be invalid
5. The equipment is rated to operate at an altitude less than 2000 m.
6. Installation:
Equipment not suitable for use in the presence of explosive gases.
Equipment not suitable for use in the presence of flammable gases or liquids.
Not suitable for use in the presence of Exposure to strong electric or magnetic fields
Not suitable for use in the presence of Exposure to heavy vibration and shocks
Not suitable for use by untrained personnel.
7. The unit is suitable for connection to a MAINS circuit capable of delivering not
more than 160 rms symmetrical Amperes. The absolute maximum total PV array
short circuit current (D.C.) that the inverter is rated to have connected to its PV input,
under worst-case conditions of ambient temperature, irradiance, shall be less than
12A.
8. Supply earthing systems and system voltage: TN-C-S, 120/240V (L to N/ L to L)
9. PV modules for non-isolated inverters: PV modules shall have an IEC 61730 Class A
rating, PV modules must have a maximum system voltage rating based upon the AC
mains voltage.
[Surge Protective Devices (SPDs) for PV installation]
Over-voltage protection with surge arresters should be provided when the PV power
system is installed.
The grid connected inverter is not fitted with SPDs in both PV input side and MAINS
side.
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Lightning can cause damage either from a direct strike or from surges due to a
nearby strike. Induced surges are the more likely cause of lightning damage in the
majority of installations, especially in rural areas where electricity supplies are
usually by long overhead lines. Surges may be induced on both the PV array
conductors and the A.C. cables leading to the building.
Specialists in lightning protection should be consulted during the endues application.
Using appropriate external lightning protection, the effect of a direct lightning strike
into a building can be mitigated in a controlled way, and the lightning current can be
discharged into the ground.
Installation of SPDs to protect the inverter against mechanical damage and excessive
stress include a surge arrester in case of a building with external lightning protection
system (LPS) when separation distance s is kept:
To protect the D.C. system, surge suppression devices (SPD Type 2) should be fitted
at the inverter end of the D.C. cabling and at the array, located between the inverter
and the PV generator, if the voltage protection level (VP) of the surge arresters is
greater than 1100 V, an additional SPD Type 3 required for surge protection for
electrical devices.
To protect the A.C. system, surge suppression devices (SPD, type 2) should be fitted
at the main incoming point of A.C. supply (at the consumer’s cut-out), located
between the inverter and the meter/distribution system;
SPD (test impulse D1) for signal line according to EN 61643-21
All D.C. cables should be installed to provide as short run as possible, positive and
negative cables of the same string or main DC supply should be bundled together,
avoiding the creation of loops in the system.
This requirement for short runs and bundling includes any associated earth/bonding
conductors.
Spark gap devices are not suitable for use in DC circuits as once conducting, they
won’t stop conducting until the voltage across their terminals is typically less than 30
volts.
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[Selection of fuse and cables]
Mains cable (AC line cable) shall be short circuit protected and thermal overload
protected.
Always fit the input cable with fuses. Normal gG (US: CC or T) fuses will protect the
input cable in short circuit situations. They will also prevent damage to adjoining
equipment.
Dimension the fuses according to local safety regulations, appropriate input voltage
and the rated current of the solar inverter.
AC output protected by external fuse (gG, rated current 16 A/ 250 VAC), provided in
all live connections to the AC supply.
The rated short circuit breaking capacity of the above protective device shall be at
least equal to the prospective fault current at the point of installation. See section
technical data of this manual for details.
AC output cables: Cu, (L,N+PE, 2x2,5+2,5mm2 with a max length of 2m and operating
time of the fuse is less than 5 seconds, installation method B2 according to EN
60204-1: 2006, annex D: cable in conduit cable trucking system, number of loaded
circuit only one. Use 90 °C wire for ambient temperature between 40 °C and 65 °C.
NOTE
For conditions differing from those mentioned above, dimension the
cables according to local safety regulations, appropriate input
voltage and the load current of the unit. (You can choose a thicker
cable but the fuses must be rated according to the table.)
NOTE
Fuses must be approved by notified body.
Inverter is provided galvanic isolation from the MAINS to the PV
array, back feed current to the array is not considered. However, DC
side current is about 20,4A and decrease to 0A within 20.4ms under
the PV input short circuit condition. Therefore, the current-carrying
capacity of the components and sub-assemblies provided in the
end-use system (connectors, cables, junction box, switchgear, etc.)
and the reverse current PV module shall be considered based on
back feed current and reverse current. The direct current (DC) circuit
breaker or fuse between each solar generator and inverter shall be
provided based on solar inverter input ratings.
Select DC cables based on the above inverter back feed current and
Isc PV rating and Vmax ratings.
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[Isolation Device]
The inverter is not provided with isolation device.
However, as a complete assembly or system, the unit requires that the customer
shall supply external fuses and isolation device. This is not only good practice based
on safety consideration, but is a mandatory requirement as a license condition of an
approved equipment. A manual AC switch disconnector and DC switch disconnector
must be provided located in an accessible position.
Please check the unit nameplate and run ample capacity. A suitably rated Isolating
Switch (this is also an option that could be selected) should be fitted immediately
adjacent to each unit and installed both for AC output and DC input.
All incoming phase lines and neutral conductors and PV generator cables are to be
suitably fused at the Sub-Board to protect the installed wiring and the unit.
During installation, care should be taken to ensure that:
–An appropriate approved disconnect device shall be provided as part of PV system;
installation which shall disconnect simultaneously all live conductors of mains
supply.
–An appropriate approved disconnect device shall be provided as part of the device;
installation which shall disconnect simultaneously all PV input conductors of PV
generator.
– The disconnect devices are positioned in close proximity to the equipment and is
easily accessible to the operator.
– It is clearly marked as a disconnect device for the solar inverter unit.
Therefore, install separately a hand operated input disconnecting device (means)
between the PV generator and inverter, between MAINS and inverter. The
disconnecting devices must be of a type that can be locked to the open position
during installation and maintenance work, and constructed to disconnect all live
conductors of its power supply circuit.
Place a warning sign “do not turn on – maintenance in progress” on the external
disconnecting switch when it is shut down, and make sure that on/off remote
controls are inhibited.
Dual supply labelling should be provided at the service termination, meter position
and all points of isolation to indicate the presence of onsite generation and
indicating the position of the main A.C. switch disconnector.
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[Emergency Stop Devices]
For safety reasons, install the emergency stop devices at station adjacent to solar
inverter combiner in the end system.
The emergency stop of the unit can be enabled using the service switch as required
in section [Isolation device] if this isolation device is installed adjacent to solar
inverter.
[PE Connection and Leakage Current]
The endues application shall monitoring of the protective conductor by a residual
current operated protective device (RCD) with rated fault current Ifn ≤30mA which
automatically disconnects the device in the case of a fault.
WARNINGS
EARTH CONNECTION ESSENTIAL BEFORE CONNECTING SUPPLY
Incorrect grounding can cause physical injury, death or equipment
malfunction and increase electromagnetic interference.
Make sure that grounding conductors are adequately sized as
required by safety regulations.
Do not connect the ground terminals of the unit in series in case of a
multiple installation.
WARNINGS
This product can cause current with an A.C. component. Where a
residual current operated protective (RCD) or monitoring (RCM)
device is used for protection in case of direct or indirect contact, only
an RCD or RCM of Type B is allowed on the supply side of this
product.
[Safety Check]
The following safety checks should be performed at least every 12 months by
manufacturer’s qualified person who has adequate training, knowledge, and
practical experience to perform these tests. The data should be recorded in an
equipment log. If the device is not functioning properly or fails any of tests, the
device has to be repaired.
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1. Inspect the equipment and accessories for mechanical and functional damage.
2. Inspect the safety relevant labels for legibility.
3. Inspect the fuse to verify compliance with rated current and breaking
characteristics.
4. Verify that the device functions properly as described in the instructions for use.
5. Verify that the current/voltage sensors functions properly.
6. Verify software or firmware that performs safety critical application functions
properly.
7. Check earth connection, retightening of terminals
8. Check the following safety parameters which are factory set and fixed per IEC
62116:2008 and IEC 61727:2004, this trip point is factory set and fixed, user cannot
change this parameter.
Exceeding this limit will trigger de-energized-to-trip system and alarm within time as
specified in the following tables.
WARNING!
The device is not provided with ground-fault
detector/interrupter unit.
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WARNING!
The device is not provided with automatic disconnecting
means – this device shall be provided with external
relaying protection in accordance with local codes and
local utility requirements.
9. Measurement of insulation resistance, consult manufacturer.
10. Measurement of earth resistance, consult manufacturer.
11. Mounting structures: Verify tightness and integrity of bolts and other fastening
devices;
Verify if there is significant corrosion
12. Using manufacturer’s procedures and/or technical data on an “as-needed” basis
when performing periodic component calibrations.
Consult manufacturer for safety check procedure.
[Interface Protection and Inverter Set Points]
WARNING!
The device is not provided with ground-fault
detector/interrupter unit.
WARNING!
The device is not provided with automatic disconnecting
means – this device shall be provided with external
relaying protection in accordance with local codes and
local utility requirements.
Incorporated interface protection is designed according to IEC 61727:2004 and IEC
62116:2008, it is insensitive to normal voltage and frequency variations in the
distribution network.
The interface protection ensures that the inverter cease to energize the distribution
network when any parameters listed as below exceeds the applied operating setting.
Disconnection is provided in case of any hardware malfunctioning.
The solar inverter will cease to energize the network in response to an interface
protection; however, this is not achieved by disconnecting means between inverter
and grid.
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Default interface protection settings
WARNINGS
Alteration of the above settings or full setting range of the interface
protection may cause a breach of the type-certificate marking.
Unauthorized access to factory safety parameters setting and
software should be prohibited.
A reset to the factory safety parameters requires retesting and verification in
conjunction with the end-use system.
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4 The INVOLAR Micro-Inverter System Instruction
4.1 The INVOLAR Micro-Inverter System
The three key elements of an INVOLAR Micro-Inverter System are:

The INVOLAR Micro-Inverter

The INVOLAR ETU communication gateway

The INVOLAR SDEDAS web-based monitoring and analysis

PV module
The INVOLAR Micro-Inverter maximizes energy production from the PV array. Each
INVOLAR Micro-Inverter is individually connected to one PV module in the array. (See
Figure 4-1).
This unique configuration means that a Maximum Peak Power Point Tracker (MPPT)
controls each PV module. The INVOLAR Micro-Inverter ensures top performance for
its associated PV module although individual PV modules in the array may be
affected by shading, soiling, orientation, or PV module aging. This insures that the
maximum power available from each PV module with a consequent up to 25% more
energy production. The distributed nature of the INVOLAR Micro-Inverter System
insures that there is no single point of system failure in the PV system.
PV
PV
L N PE
MAC250
MAC250
Grid
Meter
LCF
MAC250
MAC250
PV
PV
Energy
Terminal
Unit
Local
PC
Broadband
router
SEDAS-Internet
server
Customer
web terminal
Figure4-1 The INVOLAR Micro-Inverter System
NOTE
The INVOLAR ETU (Energy Terminal Unit) communication gateway, the INVOLAR
LCF(Line Communication Filter) ,and the INVOLAR SEDAS(Solar Energy Data
Acquisition System) are optional elements, before installing these elements, read
all instruction and cautionary marking in the related user manual.
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4.2 The INVOLAR MAC250 Micro-Inverter
By adopting high frequency DC link topology (Figure 4-2) and dual –DSP controller, the Involar
MAC250 achieves precise variable frequency control for soft-switching during full load range. So
that the MAC250 exhibit slow profile and high efficiency. Additionally, MAC250 shows high
reliability, high power factor and low total harmonic distortion. The INVOLAR MAC250
Micro-Inverter realize the system expansion by simple parallel operation (maximum 16 PV
modules per branch)
Lo
vo
io
Cin
PV
HF
DC/DC
Co

vG

Figure 4-2 the INVOLAR MAC250 Micro-Inverter Operation Principle
4.3 Features
Advantages
 Easy installation
 Without parameter configuration
 High level system reliability
 Low PV system noise
 Remote web-based monitoring and analysis
 System maximize energy harvest
Performance
 High efficiency
 High power factor
 Soft start
 Low current harmonic
 Low DC injection
Protection Function
 Over voltage and under voltage protection
 Over frequency and under frequency protection
 Over current protection
 Input polarity reverse protection
 Short circuit protection
 Over temperature protection
 Anti-Island
 Anti-abnormal discharge protection
 Recovery of grid-connected protection
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5 INVOLAR Micro-Inverter Installation
WARNINGS: In case of installation in PV system, start up of the unit (i.e. start of
designated operation) is prohibited until it is determined that the full system meets
the requirements stipulated in the EC Directive (2006/95/EC, 2004/108/EC etc.).
The grid-Connected Inverter leaves the factory completely connecting device and
ready for connection to the mains and PV supply. The unit shall be installed in
accordance with national wiring regulations. Compliance with safety regulations
depends upon installing and configuring system correctly, including using the
specified wirings. The system must be installed only by professional assemblers who
are familiar with requirements for safety and EMC. The assembler is responsible for
ensuring that the end system complies with all the relevant laws in the country
where it is to be used.
The individual subassembly of the system shall be interconnected by means of the
wiring methods outlined in national/international regulations but not limited to the
BS7671 Requirements/ VDE regulation 0107.
To ensure the safe operation of the devices, they may be installed and
commissioned only by qualified personnel in full compliance with the warnings
referred to in this manual.
Open the package and pick the product, check that if there is any distortion or
impaired during transportation, meanwhile, check that if all the relating accessories
and materials are here, you can see the accessories list in the “Appendix”.
The instruction manual is an integral part of the unit and should therefore be read
and kept carefully.
It is recommended that the packaging should not be removed until the unit is
located in the installation site.
Do not dispose of packaging materials in the environment or leave them within
reach of children as they may represent a hazard
Check that there are no signs of damage. Before attempting installation and
operation, check the information on the type designation label of the unit to verify
that the unit is of the correct type. The label includes an IEC rating and CE markings,
a type code and a serial number, which allow individual recognition of each unit.
Check the mechanical and electrical installation of the unit before startup. Go
through the checklist below together with another person. Read the sections “Safety
instruction and EC Directives” and “Interface protection and Inverter set points’ on
the previous pages of this manual before you work on the unit.
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Use a solid hard wall or metal structure.
Before installing the unit, agree with the customer the site.
Do not allow foreign object into the unit.
The rating plate and warning marking must be readable after installation.
Install the unit clear of any obstructions. The enclosure must never be covered.
The equipment is classed as one not accessible to the general public.
A suitable guarding which is keep min. 1.5mm distance around the perimeter of the
device is mandatory to prevent against access to general public, especially for
children or infirm persons when the device is located in an unprotected area.
Make sure that dust from drilling does not enter the unit when installing.
Do not place flammable materials near the unit. Failure to observe this warning may
result in a fire.
The solar inverter shall be installed so that the inverter couplers shall be easily
accessible and located between 0.6m and 1.9m above the servicing level. An upper
limit of 1.7m is recommended.
-easy access to the electrical power connection point;
-accessibility for maintenance and repair work;
Parts serving for support or immobilization of unit shall be designed and
manufactured so as to minimize the RISK of physical injuries and of accidental
loosening of fixings.
Loading capacity and hardness of the supporting surface, Load rating of mounting
bracket should be at least four times the weight of the devices according to EN
62109-1, and supporting characteristics will be impaired by wear, corrosion, material
fatigue or ageing. This shall be calculated by inspection of the design data of
supporting material and consulting construction engineer.
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5.1 INVOLAR MAC250 Micro-Inverter operational environment
Temperature
INVOLAR MAC250 Micro-Inverter full power operation ambient temperature:
-40°C~﹢65°C,above 25°C , the inverter output power drops at the same
temperature coefficient as the PV module’s, i.e., 0.44% per degree Celsius.
Humidity
Air humidity≤90%。
Storage
If the INVOLAR MAC250 Micro-Inverter had been stored for 2 years, the inverter may
need to be energised before being installed. Please contact INVOLAR for more
information.
5.2 INVOLAR MAC250 Micro-Inverter operational condition in PV System
PV Module
The max PV Module open circuit voltage is no more than 50V.
The range of PV Module output power is 180W-250W.
Connection to the electrical utility grid
Connect the INVOLAR Micro-Inverter to the electrical utility grid only after receiving
prior approval from the utility company. It should match the on-grid conditions:
Type
Voltage
Frequency
5-1 Parameter of power grid
Rate Value
Variation Range
240V
﹣12% -﹢10%
60Hz
±0.5Hz
Connection Cable
The diameter of connection line should match the basic flow capacity.
5.3 Installation Steps
The unit shall be installed in accordance with national wiring regulations. Compliance
with safety regulations depends upon installing and configuring system correctly,
including using the specified wirings. The system must be installed only by
professional assemblers who are familiar with requirements for safety and EMC. The
assembler is responsible for ensuring that the end system complies with all the
relevant laws in the country where it is to be used.
The individual sub-assembly of the system shall be interconnected by means of the
wiring methods outlined in national/international regulations such as but not limited
to the BS7671 Requirements/ VDE regulation 0107.
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Power to the unit must be turned on only after installation work has been
completed. All electrical connections must be carried out by qualified personnel in
accordance with legislation in force in the country concerned.
Before connecting, disconnect the connection between solar generator and inverter and locked it
to the open position during installation. Place a warning sign “do not turn on – maintenance in
progress” on the external disconnecting switch when it is shut down, and make sure that on-off
remote controls are inhibited. Refer to this manual, section 3.Safety instruction and EC Directives
– isolation device.
The open-circuit voltage of PV generator under worst case conditions of ambient
temperature, irradiance, etc. shall not exceed 50V, failure to observe this, it may
cause electric shock hazards or completely damage of the inverter.
WARNINGS
HIGH LEAKAGE CURRENT, EARTH CONNECTION ESSENTIAL BEFORE
CONNECTING SUPPLY.
For the cables connected to PV inverter and Grid, choose the appropriate wires
according to the capacity of the inverter and PV components.
Calculate the max. input current and max. output current of the inverter according to the actually
system , inverter rating label and TECHNICAL PARAMETER. For details, refer to this manual,
Section 3 Safety instruction and EC Directives, [Selection of fuse and cables].
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INVOLAR MAC250 Micro-Inverter outside Dimension
Dimension as following Figure 5-1 shows:
Figure 5-1 INVOLAR MAC250 Micro-Inverter outside dimension
NOTE
Allow enough space around the Micro-Inverter.
Allow 350mm between two Micro-Inverters.
The cables we recommend are as follow.
Model
MAC250
AC cable
(Cu) mm2
2x2.5+2,5
DC cable
See below
AC Circuit breaker
16
250
1,45 x Iz
Check that the operating time of the circuit breaker is below 5 seconds.
To select power supply cables as specified in the above table (for details, the cable
manufacturer should be consulted.)
Dimension the mains (input power) and DC input cables according to local
regulations.
Double insulated shielded symmetrical copper cable with a max length of 5m is
required for power circuit.
AC cable: Rated voltage of the cable amount to at least Uo/U= 300V/500V (in
accordance with DIN VDE 0298), VDE or equivalent approved cord, see section
[Selection of fuse and cables].
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DC cable: Code designation: PV1F;
Rated voltage AC U0/U 0, 6/1 kV; ambient temperature: –40 °C to +90 °C; Max.
conductor temperature: 120 °C; TUV or equivalent approved recommended.
All positive connections shall be made with Red insulated wire, and all negative
connections with Black insulated wires.
To guarantee the degree of protection IP65, the installation connector and
connector shall be used based on its manual.
Detailed Installation Procedure
Installation in the following sections is numerically referenced in the installation
Figure 5-2 below.
Figure 5-2 MAC250 Micro-Inverter Installation
DANGER
 Be aware that only competent personnel could connect
INVOLAR Micro-Inverter to the electrical utility grid.
DANGER
 DO NOT connect INVOLAR Micro-Inverter to the utility grid
or energize the AC circuit(s) until the all installation
procedures have been completed.
WARNING
 Effective grounding during Micro-Inverters are working.
 Comply the rules of correctly use of tools and personal
protective equipment (PPE) for insuring the Micro-Inverter
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safe running.
CAUTION
Inverter DC input power cable and the output cables must be
isolated from each other, and do not put them in the same cable
tray or cable rack.
Figure 5-3 MAC250 Micro-Inverter detailed Installation diagram
Each of the detailed installation steps is in the above Figure 5-3 shows:
① Attaching the INVOLAR Micro-Inverters to the racking
② Connecting the INVOLAR Micro-Inverter left side cables.
③ Connecting the INVOLAR Micro-Inverter right side cables.
④ Connect the PV modules
Diagram5-4 AC output cable
Yellow/Green - PE
Brown
-L
Light Blue - N
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N -Light Blue
PE - Yellow/Green
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Note
MAC250 Micro-Inverter DC connectors are standard, and they should match to the
connectors on PV Modules.
Grounding
1. Nut and bolt to racking system.
Consider using WEEB type clips for
improved earth connection.
2. Earth grounding terminal. Connect
suitably size grounding cable as per
Countries current wiring
regulations and legislation
Grid connection
1. Wire fastening and split
Screw connection:
Tightening torque typically 0.8Nm-1.0Nm
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Click!
Click!
2. Connector fastening and split
Click!
Tightening torque:
4+1 Nm
Click!
3. Connector Locking and split
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6. Function Instructions
6.1 Working Mode
The working modes of an INVOLAR Micro-Inverter are:

Start-up

Active

Fault

Standby
The detailed working mode descriptions are as below:
Start-up
Start-up mode is for a newly installed INVOLAR Micro-Inverter. This start-up mode
must base on the proper AC and DC cables connecting and whole PV system
grounding.
Active
When the Micro-Inverter is in normal operation process, this insures that the power
available from each PV module is exported to the utility grid.
Fault
If the PV system does not operate correctly, INVOLAR Micro-Inverter would stop
automatically and enter into Disable mode. The INVOLAR Micro-Inverter system
keeps detecting the disable information. The INVOLAR Micro-Inverter is in disable
mode until fault release. If the inoperative Micro-Inverter has been repaired and
match to the electrical utility grid, the whole INVOLAR Micro-Inverter system would
enter operation mode after 20 seconds to 5 minutes. Be aware that only qualified
personnel should maintain the INOVLAR Micro-Inverters.
Standby
When the Micro-Inverter is in operation process but keeps with low voltage and
current in AC side for a certain time. The Micro-Inverter manages transition from
“Active” to “Standby”. In “standby” mode, Micro- Inverters keep detecting the energy
output of PV Modules. When the output energy reaches the power generation
conditions, the inverter would enter into “Active” from the “Standby” state.
CAUTION
INVOLAR Micro-Inverter cannot enter into “Standby” or “Active” mode when
the PV modules are insufficient in the conditions of night and rainy day.
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6.2 Grid Connection
INVOLAR MAC250 Micro-Inverter system connects grid automatically. It detects
and monitors the performance of each PV module in your PV array. When the output
energy reaches the power generation conditions, the INVOLAR MAC250
Micro-Inverter system begin connect grid and generate electricity.
In the process of connecting grid and generating electricity, a Maximum Peak
Power Point Tracker (MPPT) controls each PV module by INVOLAR Micro-Inverter
system.
6.3 Grid Disconnect
If the state grid cannot match the following situations (diagram 6-1), it bring the
INVOLAR Micro-Inter to a rest.
Diagram (6-3) Parameter of European state power grid
Type
Rated
Variation Range
Voltage
240V
211V - 264V
Frequency
60Hz
59.3Hz - 60.5Hz
Only to be carried out by qualified competent personnel.
Start inverter after checking all below steps:
WARNING
Connect the INVOLAR Micro-Inverter to the electrical utility grid only after
receiving prior approval from the utility company.
WARNING
Only competent qualified personnel should connect INVOLAR
Micro-Inverter to the electrical utility grid.
Installation checklist
To ensure the safe operation of the devices, they may be installed and
commissioned only by qualified personnel in full compliance with the warnings
referred to in this manual.
Checklist
Check the mechanical and electrical installation of the unit before start up. Go
through the checklist below together with another person. Read the Safety
instructions and EC directives on the previous pages of this manual before you work
on the unit.
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Mechanical Installation
Check screw connections on the inverter for tightness.
The ambient operating conditions are allowed. (See Technical parameter);
The unit is fixed properly on a non-flammable wall. (See Mechanical installation.)
The cooling air will flow freely. The unit is fixed tightly and support is enough. (See
Mechanical installation.)
Electrical Installation
Check polarity and voltage of the solar generator, make sure poles are correct and
without reverse the poles of the connections!
Check all screws of the connection terminals in the installation system before and
after the inverter for tightness.
The unit is grounded properly. The DC input voltage and AC output voltage matches
the unit nominal voltage. Make sure that the solar generator cannot exceed the
permissible input voltage range of the device
The DC input and mains connections and their tightening torques are OK.
Appropriate DC input and AC output fuses and disconnector are installed.
The external cords and cables are fixed tightly, and strain relief clamp is provided for
external accessible cords and cables。
Cord and cable inlets are sealed completely after cord/cable installation.
Start-Up Checks
The device has been checked at the factory and adjusted so that it can be
commissioned immediately after being installed.
Following Section Installation checklist, for your personal safety and to avoid
damage, the following safety checks should be performed before commencing by a
competent qualified person who has adequate training, knowledge, and practical
experience to perform these tests. The data should be recorded in an equipment log.
If the device is not functioning properly or fails any of tests, the device has to be
repaired.
1. Inspect the equipment and accessories for mechanical and functional damage.
2. Inspect the relevant safety labels for legibility.
3. Inspect the fuse to verify compliance with rated current and breaking
characteristics.
4. Measurement of insulation resistance
5. Measurement of earth resistance
6. Mounting structures: Verify tightness and integrity of bolts and other fastening
devices;
Verify if there are any signs of corrosion.
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7 Disconnecting a Micro-Inverter from the PV Module
To ensure safe disconnection of the micro-inverter from the PV array, it must NOT
be carried out under load conditions. Ensure the following disconnection steps are
carried out in the order shown:
1. Cover the PV module (s) with an opaque cover.
2. Using a proved DC current test instrument, verify there is no current flowing in
the DC wires between the PV module and the micro-inverter.
3. Care should be taken when measuring DC currents, most clamp-on meters
must be zeroed first and tend to drift with time.
4. Isolate the AC branch circuit by isolating the circuit breaker.
5. Using a proved AC current test instrument, verify there is no current flowing in
the flowing into the branch circuit from the circuit breaker..
6. Disconnect the first AC connector in the branch circuit.
7. Using a proved DC current test instrument, AGAIN verify there is no current
flowing in the DC wires between the PV module and the micro-inverter.
8. Disconnect the PV module DC wire connectors from the micro-inverter.
9. Remove the micro-inverter from the PV array racking.
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8 Monitoring and Troubleshooting and Maintenance
No user-serviceable parts inside. Servicing should be carried out by a competent
person who has adequate technical knowledge of the product. Never operate this
product and change any part of inverter yourself. For servicing you should contact
INVOLAR Corporation direct or an authorised distributor.
Safety checks
Safety checks should be performed at least every 12 months by a competent person
who has had adequate training, knowledge, and practical experience to perform
these tests. The data should be recorded in an equipment log. If the device is not
functioning properly or fails any of the tests, the device has to be repaired.
For safety check details, refer to this manual, section 3 Safety instruction and EC
Directives.
Maintain periodically
Only competent qualified person may perform the following works.
During the process of using the inverter, the competent person shall examine and
maintain the device regularly.
The required maintenance checks which should be carried out every 12 months are
as follows:
1. Check the operation of the inverter. See that the LED is flashing in a healthy status.
2. Check the casing of the inverter for any signs of damage or corrosion.
3. Check the input and output cables for signs of corrosion, rodent damage or
overheating.
4. Check the condition of he connector for signs of corrosion or overheating.
5. Check the PV modules for build up of debris or any heat spots.
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Before cleaning the inverter:
 Wear gloves and safety glasses.
 Isolate the DC supply to the inverter.
 Isolate the AC supply to the inverter.
 Wait for 45 minutes to ensure and positively charged components have
discharged.
 Clean the inverter casing with a damp cloth carefully.
 Check for any signs of corrosion or defects to the casing, cabling and cable
connector.
 Reinstall the inverter following the installation steps.
8.1
Overview
The application of power line communication technology in INVOLAR MAC250 Micro-Inverter
enables the users to monitor and maintain the whole PV system through the internet. By visiting
INVOLAR’s website and entering the SEDAS portal (Solar Energy Data Acquisition System)
customers can track real time statistics information of the energy harvest. Monitoring per module
performance data enables easy maintenance and fast and effective fault finding.
Power line
MAC250
MAC250
MAC250
Energy
Terminal
Unit
MAC250
MAC250
Local
PC
MAC250
Power line
Broadband
router
Internet
Server
Customer
web terminal
Figure 8-1 MAC250 Micro-Inverter Communication System
8.2 MAC250 MICRO-INVERTER Status LED Indications and Error
Reporting
You can access the INVOLAR MAC250 Micro-Inverter system LED menu to detect the
operation conditions. MAC250 MICRO-INVERTER Status LED indications and error
report shows as below Table (8-2)
LED Operation
4 short red blinks
Flashing green continuously
Flashing red continuously
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Start up
Producing power and communicating with ETU
Fault
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Table 8-2 MAC250 MICRO-INVERTER Status LED Indications and Error Reporting
Fields
Explain
Unit
Grid Voltage
Grid Voltage
V
Grid Current
Export DC
A
Grid Frequency
Grid Frequency
Hz
DC input voltage
DC input voltage
V
DC
Input DC
A
Power
Output Power
W
Temperature
Ambient temperature
°C
Module Temperature
MAC250 Module Temperature
°C
Daily Working Hours
Working Hours for the day
Hour
Daily power generation
Generation power for the day
kW/H
Monthly power generation
Daily power generation for the
month
kW/H
Amount of power generation Amount of power generation
kW/H
Amount of working hours
Hour
Amount of working hours
Table 8-2-1 Details Control Information
Fields
Explain
Module Disable
MAC250 module disabled in the PV system
Over temperature
MAC250 over temperature in the PV system
Over current
PV module export over current
Over DC voltage
Over DC voltage in PV module
Over AC voltage
Over voltage in state grid
Low voltage
Low voltage in state grid
Frequency disable
Island effect
Abnormal frequency in state grid
Anti-island function
Table 8-2-2 Information of Disable Mode
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NOTE
Disabling the input of a single Micro-Inverter does not affect the
operation of other INVOLAR Micro-Inverters in the system.
WARNING
 Be aware that only qualified personnel should troubleshoot
the PV array or the INVOLAR Micro-Inverter.
WARNING
 Never disconnect the DC wire connectors under load. Ensure
that no current is flowing in the DC wires prior to
disconnecting.
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9 Internet WEB
Introduction
Use The SEDAS (Solar Energy Data Acquisition System) developed by Involar to real
time track the statistics information of the energy harvest for all Involar Micro-inverter
system and monitor per-module’s performance which is integrated into the Involar
Micro-inverter system.
9.1 User Registration
Registration Page: http://v3.involar.com:7001/
Select Language then click ‘Register’ and enter details.
Login with Involar provided user name and password.
9.2 User Login
1)
Login Page: http://v3.involar.com:7001/
Select the language of your preference.
User login page shown below.
Please refer to the SEDAS User manual for the configuration process.
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10 INVOLAR MAC250 Micro-Inverter Technical Data
10.1 Technical Specifications
Model
MAC250-230-UK
PV Input Quantities
Rated DC Power
250W
Rated DC Voltage (VMAX PV)
50V D.C.
PV input Operating Voltage Range
24-40V
Maximum Operating PV Input Current
10A
Absolute Maximum Total PV Array Short
12A
Circuit Current (ISC PV)
Max. inverter back feed current to the array
1.8mA
Minimum Starting Voltage
20V
A.C. Output
Rated AC Power @ 25°C
Nominal A.C. Voltage
On-grid Voltage Range
Rated A.C. Current
Nominal A.C. Frequency
On-grid Frequency Range
Maximum Continuous A.C. Power@ 25°C
Maximum Output Over Current Protection
Maximum Output Fault Current
Max. units per branch-circuit
Maximum size branch-circuit over
current-protection
Total Harmonic Distortion
Power factor
Peak inverter efficiency
CEC weighted efficiency
Ingress Class
Pollution degree
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235W
240V
211 – 264V
0.98A
60Hz
59.3 – 60.5 Hz
235W
2A (IEC 60269, gG fuse)
38 Amps peak
16
16A
<3%
>0.99
95.0%
94.0%
NEMA4
Pollution degree 3, not intended for heavy
pollution of the air by dust, smoke, corrective or
radioactive particles, vapours or salt
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Protection against electric shock
Transformers and isolation
Certification
Noise Level
Array residual
current detection
Array ground insulation
Resistance measurement-threshold
setting
Operating temperature range
Environmental
categories,
environmental
conditions
Class I
An internal isolation transformer is provided in
micro-inverter, internal transformer is galvanic
isolation from the MAINS and PV array by
reinforced insulation.
UL1741/VDE0126-1-1
< 40 dB
WARNING! An RCD with a residual current setting
of 30mA, located between the inverter and the
mains, shall be provided at the end-use
application! The RCD must be type B rather than
type A or type C
The device is not provided with ground-fault
detector/interrupter unit.
Considered in the end-use system!
-25oC~+65 oC
Outdoor (Outdoors, light weather protected,
mounted away from high temperature plant, and
no direct sunlight.)
In storage:
Temperature :–10°C to +65 °C;
Relative or absolute humidity: 5 % to 95 %
Air pressure: 86 kPa to 106 kPa.
During transportation:
Temperature : –25 °C to +70 °C;
Relative or absolute humidity: 5 % to 95 %
Air pressure: 70 kPa to 106 kPa
Dimensions (WxHxD)
235mmx144mmx53mm
Weight
2.9kg
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11 Appendix
11.1 Limited Warranty
INVOLAR provides a 15-year warranty (the exact time depends on the contract) due
to our responsible attitude towards our customers, partners and our confidence in
INVOLAR products. During the warranty period, if any defect in workmanship and
materials of the INVOLAR micro-inverters is detected, customers are entitled to ask
for replacement or repairing from INVOLAR with no extra cost.
During the Warranty period, retain the product invoices and purchase date for free
replacement or repairing. Proof of purchase will be required. The Limited Warranty
does not cover the product which trademark is not visible.
The Limited Warranty does not cover following situations:
 Damaged by transportation
 Improperly installed
 Improperly operated
 Improperly handled or used
 Use under conditions for which the product was not designed or in an
unsuitable environment.


Any installation and use beyond the scope of relevant international standards
Damage cause by abnormal natural environment
The exact product dimensions and technical data depend on the latest released
version, like has the change without prior notice.
Version 1.2 INVOLAR Corporation Ltd.
AUG. 2011
(NA)
46
11.2 INVOLAR MAC250 Micro-Inverter System Sample Wiring
Diagram
Version 1.2 INVOLAR Corporation Ltd.
AUG. 2011
(NA)
47
11.3
EC Declaration of Conformity
Certificate
This certificate is for the INVOLAR Corporation’s MAC250
micro-inverter’s compliance to the relevant requirements.
Product Type
Model
Product Features
Photovoltaic
Micro-inverter
MAC250
Single-phase, with
Transformers, Grid-tied
INVOLAR Corporation hereby certifies the following in reference to the
above product:
1) It fulfils all the safety requirements according to IEC62109 -1 “Safety of power
converters for use in photovoltaic power systems”;
2) In case of power failure on the part of the power grid, it shall shut down and stop
outputting voltage and current;
3) It fulfils the following requirements according to EN50438 “Requirement for the
connection of micro-generators in parallel with public low-voltage distribution
networks”:
a) An automatic (re-)connection to the public grid is performed, provided that
the grid voltage and frequency are within the range of 184-264V (-20 % and
+15% of 230V) and 49.5 Hz–50.5Hz (±0.5Hz of 50Hz), respectively;
b) An immediate (< 0.2 s) disconnection is performed by the inverter, if the
voltage, or the frequency or both are not within the limits of 184-264V or
49.5 Hz–50.5Hz, respectively;
c) Reconnection time after clearance of grid failure is no less than 180 seconds;
4) The total harmonic distortion of the output current (THD) is less than 3%.
Junyin Gu, 13.01.2010
CTO
INVOLAR Corporation,Ltd.
Version 1.2 INVOLAR Corporation Ltd.
AUG. 2011
(NA)
48
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