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Meikai ENERGY
Meikai N220/N300 Micro-Inverter
Installation and Operation Manual
Version: 1.0
NOTICE:
MKSTAR –N270: Pairs with most 60-cell PV modules
MKSTAR –N220/N300: Pairs with most 72-cell PV modules
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Copyright MeiKai ENERGY 2012
REV 1.0
Meikai ENERGY
Contact Information:
Shenzhen Meikai Electronics Stock Co., Ltd
Address: Blk B13,Hengfeng Industrial City,Hezhou,Xixiang,Bao’an,Shenzhen,China
Tel:+86-0755-86079109
Fax:+86-075586079197
www.meikaienergy.com
info@meikai-cn.com
Thanks for choosing Meikai N220/N300 Micro-Inverter. For your
own safety and to ensure the operation of the equipment, please
read this manual carefully before installation and operation.
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Copyright MeiKai ENERGY 2012
REV 1.0
Meikai ENERGY
All rights reserved: Meikai reserves the right to change the product and the content of this manual
without WARNING. Users are recommended to visit the company website www.meikai-cn.com for more
information about new products and latest versions of user manuals.
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Table of Contens
Table of Contens...................................................................................................................................... 4
Installation and Operation Instructions ................................................................................................ 5
Important Safety Instructions ......................................................................................................... 5
Safety Information............................................................................................................................ 5
Meikai Micro-inverter System ................................................................................................................ 6
Meikai Micro-inverter ....................................................................................................................... 6
System Monitoring ........................................................................................................................... 7
System Reliability ............................................................................................................................ 7
Simplified System Design ............................................................................................................... 7
Electrical Compatibility ................................................................................................................... 7
Meikai Micro-inverter Installation Guide ............................................................................................... 8
Meikai Micro-inverter Installation Kit ............................................................................................. 8
Installation Procedure............................................................................................................................. 8
Step 1-Installing the AC branch circuit junction box ................................................................... 9
Step 2- Attach Meikai Micro-inverter to the racking ................................................................... 10
Step 3-Connect the Meikai micro-inverter to the AC branch cable .......................................... 10
Step 4-Grounding the system ....................................................................................................... 12
Step 5-Connect the PV modules................................................................................................... 12
Step 6-Complete the Meikai Micro-inverter Installation Map .................................................... 13
Commissioning...................................................................................................................................... 13
Commissioning a Meikai Micro-inverter system: ....................................................................... 13
Troubleshooting .................................................................................................................................... 14
LED Indications .............................................................................................................................. 14
Starting up ...................................................................................................................................... 14
Sarting Grid connect indication ................................................................................................... 15
Normal operation indication ......................................................................................................... 15
Communication indication ............................................................................................................ 15
Failure indication ........................................................................................................................... 15
Failure Report ................................................................................................................................. 15
Troubleshooting Procedure .......................................................................................................... 16
Disconnect the micro-inverter from the PV module .......................................................................... 16
Replace a Meikai Micro-inverter .......................................................................................................... 17
Technical Specifications....................................................................................................................... 18
Technical Specifications ............................................................................................................... 18
Appendix ................................................................................................................................................ 21
Meikai Micro-inverter Installation Map......................................................................................... 22
Quick installation Guide ................................................................................................................ 23
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Installation and Operation Instructions
Important Safety Instructions
This manual contains important instructions for equipment installation and maintenance. For your own
safety, please follow the safety instructions during the installation and maintenance. Please pay
attention of the following safety symbols:
WARNING:This indicates a situation where failure to follow instructions may cause
personnel danger or serious hardware failure. Use extreme caution when performing this
task.
NOTE: This indicates information particularly important for optimal operation. Follow
these instructions closely.
Safety Information
WARNING: the Meikai Micro-inverter dissipates heat through its case, the temperature
may 15 °C higher than ambient temperature. DO NOT touch the device surface when
device is running to avoid burns. Handle the device with caution.

The installation of inverter must be performed in full compliance with the National Wiring Rules of
Standard AS/NZS 3000 and other relative local standards and regulations.

Be aware that only qualified personnel are allowed to maintain Meikai Micro-inverters.

DO NOT attempt to repair the Meikai Micro-inverter, it is unrepairable. If it fails, please return
the unit to your distributor or Meikai Customer Service for maintenance. Tampering with or
opening the Meikai Micro-inverter will void the warranty.

Before installing and operating Meikai Micro-inverter, please read all instructions for the
inverter and the module. Be aware of the WARNINGs appear in the technical description.

Connect the Meikai Micro-inverter to the local electricity utility grid only after receiving prior
approval from the utility company. Meikai takes none responsibility for any on-grid system
without such approval.

DO NOT disconnect the PV module from the Meikai Micro-inverter without disconnecting AC
power.
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Meikai Micro-inverter System
Meikai Micro-inverter system is the most advanced and simple distribution solar system. This manual
contains detailed instructions for installing and operating the Meikai Micro-inverter.
There are three key elements of Meikai Micro-inverter System:



Meikai Micro-inverter
Meikai Messenger the communication gateway device
Megawatt Web-based Monitoring and analysis system
The total integrated system maximizes the energy harvest, simplifies the design, installation and
management, and greatly improves the system stability.
Meikai Micro-inverter
The Meikai micro-inverter maximizes the harvest of solar energy. Each Meikai micro-inverter works
independently with one PV module,Each PV module has individual Maximum Peak Power Tracking
and insures that the maximum power is exported to the utility grid regardless of the performance of the
other PV modules in the array. When PV modules in the array are affected by shading, soiling,
orientation, or mismatch, the Meikai Micro-inverter insures top performance from all PV modules in the
array.
The Meikai Micro-inverter is a grid connected device. the Meikai Micro-inverter employs advanced
digital control technology to invert DC to AC which has the identical frequency and phase and upload it
to the utility grid. The main features of Meikai Micro-inverter are simplified installation, reliability, stability,
maximum energy harvest and intelligent monitoring. The completed self-protection functions greatly
improve the stability and reliability of the solar system. The Meikai Micro-inverter adopts totally enclosed
potting technology to improve its enclosure protection rate to IP65.
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System Monitoring
The user just needs to simply connect the power cable to the indoor socket, and the Ethernet network
cable to the computer, the Meikai Messenger will upload the whole operating data of the Micro-inverter
to the web server. Both current and historical operating data can be accessed through the Megawatt
website. The user will also quickly detect if the system is not running properly.
System Reliability
It is commonly recognized that Micro-inverter system is more reliable compare to traditional central or
string inverters due to its original design concept. The distributional power output Micro-inverter system
eliminates single point failure. The Meikai Micro-inverter is designed to operate without power loss when
ambient temperature is 65°C. The enclosure protection rating of Meikai Micro-inverter is IP65 to
undergo any weather condition.
Simplified System Design
Meikai Micro-inverter system makes it is extremely simple to plan or design a solar system, no
complicated string calculation needed, no certain number, model, tilt demanded, no cumbersome
central or string inverter requested, each of the Meikai inverter will be easily mounted on the rack under
the module, the DC wire from the module directly connect the Meikai Micro-inverter simply with quick
terminals, no risk of 600V or higher voltage electricity shock.
Electrical Compatibility
At this moment, the Meikai N220/N300 Micro-inverter matches only with most modules with 72 cells with
proper voltage and current range. The Meikai Micro-inverter shall be connected to the utility grid with
voltage range from 205V to 253V and frequency of 50Hz. Depends on the two different ways of
installation, 14 units are allowed in a branch if the N220 Micro-inverters are connected in series, 11 units
are allowed in a branch if the N300 Micro-inverters are connected in series, if a busbar is used, the
number of units is depending upon the wire diameter.
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Meikai Micro-inverter Installation Guide
Please read the Installation and Operation Manual before installing a Meikai Micro-inverter.
WARNING: Perform all electrical installations in accordance with all local electrical
codes.
WARNING: risk of electricity shock, the grounding line may become live if not
grounded properly.
Meikai Micro-inverter Installation Kit
Major parts:
Except the Micro-inverter, module, rack and hardware tools, the following items are needed to establish
a system:
 ·protective caps
 ·mounting bracket
 ·AC interconnect cable
 ·AC junction box
Other parts and tools required:
 ·grounding cable and washer
 ·hardware tools for mounting modules to the rack
 ·socket wrenches
 ·screwdrivers
 ·torque wrenches
Installation Procedure
To install a Meikai Micro-inverter system involves 6 key steps as following:
1. check and install the AC branch circuit junction box
2. attach Micro-inverter to the racking
3. connect the Micro-inverter to the AC branch cable
4. grounding the system
5. connect the PV modules
6. Complete the Meikai Micro-inverter installation map.
Each of the detailed installation steps in the following sections is numerically referenced in the
installation diagram below.
WARNING: DO NOT connect the Meikai Micro-inverter to the utility grid until you have
completed all of the installation procedures as described in the following sections.
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Step 1-Installing the AC branch circuit junction box
A、Check and make sure the AC voltage is within the voltage range indicated on the label.
B、Mount the Meikai adapter plate at a suitable location on the PV racking system (typically at the
end of a branch of modules).
C、Connect the open wire end of the AC interconnect cable into the junction box using an
appropriate gland or strain relief fitting.
D、Work out the total current basis on the number of micro-inverters in each branch, use an
appropriate cable and connect the AC branch circuit junction box to the point of utility
interconnection.
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Step 2- Attach Meikai Micro-inverter to the racking
A. Determine the location with respect to the PV module junction box or any other obstructions.
WARNING: Allow a minimum of 15cm between the top of the roof and the bottom of the
Micro-inverter. We also recommend that you allow 5cm between the back of the PV
module and the top of the inverter. DO NOT mount the micro-inverter in a location that
allows exposure to direct sunlight.
B. If a grounding washer is used to connect the micro-inverter to the racking, please make sure
use only ground washer that is approved by the racking manufacturer. Use a minimum of one
grounding washer per micro-inverter.
C. Mount one micro-inverter at each of these locations using hardware recommended by your
module racking supplier.
Step 3-Connect the Meikai micro-inverter to the AC branch cable
Each micro-inverter comes with a 15cm AC wire with one 3 pin female connector and a 156cm AC wire
with one 3 pin male connector. As indicated in the following picture:
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Here is the connection method between the branches.
A.
Connect the male connecter of the first Meikai Micro-inverter in every branch to the AC
junction box.
B.
Plug the AC female connector of the first micro-inverter into the male connector of the next
micro-inverter, and so forth, to form a continuous AC branch circuit.
NOTE: Check the micro-inverter rating label for the maximum number of micro-inverters
allowed on one AC branch circuit.
C.
Install a protective end cap on the open AC connector of the last micro-inverter in the AC
branch circuit.
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Step 4-Grounding the system
NOTE: If you already use grounding washers to ground the micro-inverter to the PV
module racking as described in step 1, skip this step.
Each Meikai Micro-inverter comes with a ground screw with a diameter of 5mm.
Check your local code for grounding conductor sizing requirement. Connect the grounding electrode
conductor to the micro-inverter ground screw.
Step 5-Connect the PV modules
NOTE: Completely install all Micro-inverters and all system inter-wiring connections
prior to installing the PV modules.
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First connect the positive DC wire from the PV module to the negatively marked DC connector (female
socket) of the Micro-inverter. Then connect the negative DC wire from the PV module to the positively
marked DC connector (male socket) of the Micro-inverter. Repeat for all remaining PV modules using
one Micro-inverter for each module.
Step 6-Complete the Meikai Micro-inverter Installation Map
The Installation Map is a diagram of the physical location of each micro-inverter in your PV installation.
You can use the blank map in the Appendix to record micro-inverter placement for your system. When
your map is complete, send it to Meikai as described below. Meikai then uses this information to provide
you with detailed information about the performance of your PV system and to allow you to see a
graphic representation of your PV system on the web-based monitoring and analysis. Feel free to
provide your own layout if a larger or more intricate installation map is required.
Complete the Meikai Micro-inverter installation map.
A.
Each Meikai micro-inverter has a removable serial number label located on the mounting plate.
Peel off the label and affix it to the respective location on the installation map, which is
available at the Appendix section of this manual or Meikai website http://www.meikai-cn.com/.
B.
Send the installation map to Meikai after completion.
Commissioning
WARNING: Connect the Meikai Micro-inverter to the electrical utility grid only after
receiving prior approval from the utility company.
WARNING: Be aware that only qualified personnel must connect the Meikai
Micro-inverter to the electrical utility grid.
WARNING: Make sure that all AC and DC wiring is correct. Make sure that none of the
AC and DC wires are pinched or damaged. Make sure that all junction boxes are
properly closed. Make sure the circuit breaker for DC and AC are installed.
NOTE: The starting voltage for Meikai micro-inverter is 30V, the Meikai micro-inverter
start to operate only after the DC input voltage is 30V or above, the RED LED indicates
the Meikai micro-inverter is in normal operation.
Commissioning a Meikai Micro-inverter system:
1.
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Connect each micro-inverter to the respective PV module (make sure the module is in normal
operation), the RED LED on.
Copyright MeiKai ENERGY 2012
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2.
Switch on the circuit break on each AC branch circuit.
3.
Switch on the main AC break on the connect point of the utility grid. Your Meikai micro-inverter
will feed power to the utility grid after 2 minutes if all the micro-inverters are correctly connected.
The GREEN LED blinks in an interval of 4 seconds indicate the system is in normal operation.
4.
The Meikai micro-inverter will report the operation data to the Messenger over powerline after
2 minutes if the AC voltage is normal, each data packet in 5 minutes. The LCD screen on the
Messenger will display number of inverters, total energy harvest and other important
information. Please refer to the installation and operation manual for Meikai Messenger.
5.
Logon to the monitor website or use monitor software to check the micro-inverter operating
condition.
Troubleshooting
Safety instructions are described through the manual only qualified personnel are allowed to use the
following troubleshooting steps if the PV system does not operate correctly:
WARNING: DO NOT attempt to repair the Meikai Micro-inverter, it is unrepairable. If it fails,
please return the unit to your distributor or Meikai Customer Service for maintenance.
Tampering with or opening the Meikai Micro-inverter will void the warranty.
LED Indications
The LED indicats red,orange and green three different colors.
Starting up
With proper DC input voltage, the RED light on indicates the PV module is output power and the Meikai
micro-inverter is staring up.
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Note: the starting voltage for Meikai micro-inverter is 30V, the Meikai micro-inverter start to
operate only after the DC input voltage is 30V or above, the RED LED indicates the Meikai
micro-inverter is in normal operation.
Sarting Grid connect indication
After startup, if the utility grid voltage and the PV module energy output are normal in 20 seconds,the
micro-inverter will start to connect to the utility grid, three short Orange blinks shows the micro-inverter
is attempting to connect to the grid,after the blinks,the micro-inverter start producing power and the
Green LED still on.
Normal operation indication
After 4 seconds the Green LED off and the micro-inverter enter MPP Tracking operation the Green LED
stay on with long interval blink.
Communication indication
When operats normaly, the micro-inverter reports operation data to the Messenger every 5 minutes, at
this moment, the Green LED will blink quickly until the reporting completed.
Failure indication
N220/N300 is designed with 9 different kind of failure protections, all will spark the RED LED and stay
on until the failure is maintained.
NOTE: Only for low voltage protection, the recovery time is variable, for other situation the
recovery time is 20s. The initial recovery time for low voltage protection is 2 minutes;it
varies if the low voltage situation continues. The recovery time return back to 2 minutes if
the MPP Tracking starts working and the GREEN LED blinks in long interval.
Failure Report
There are 9 protections for N220/N300 Micro-Inverter and all failure information reported to the
Messenger, please refer to the installation and operation manual for details. The operation status can be
directly detected.
The 9 protections are as following:
 Over high input voltage
 Over low input voltage
 Over high BUS voltage
 Over low BUS voltage
 Utility grid voltage Over low
 Utility grid voltage Over high
 Utlity grid current Over high
 Micro-inverter temperature over high
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 Grounding Fault
WARNING: Be aware that only qualified personnel should troubleshoot the
Micro-inverter.
WARNING: DO NOT disconnect the PV module from the Meikai Micro-inverter without
disconnecting AC power.
WARNING: Never disconnect the DC wire connectors under load. Make sure that no
current is flowing in the DC wires prior to disconnecting.
WARNING: N220/N300micro-inverter is powered by DC power, when you reconnect the
DC wire after disconnect make sure the RED LED is on.
Trouble shooting Procedure
When PV module is operating normally and the power output is 40W or more,if the RED LED stays on,
indicates the micro-inverter is not operating correctly.
To troubleshoot an inoperable micro-inverter,please follow the steps in the order shown:
1.
2.
3.
4.
5.
6.
7.
Check and verify the utility voltage and frequency are within allowable ranges shown in the
Technical Data section on page 16 of this manual.
Check the connection to the utility grid.disconnect the AC wire prior to didconnect DC
wires. Never disconnect the DC wires while the Micro-inverter is producing power.check if
the RED lED is on after reconnect the DC wires,check if the micro-inverter is attempting to
connect to the utility geid after reconnect the AC wires.
Check the connection between the micro-inverters in the AC branch, verify the utility grid
is operating normally.
Verify all the AC circuit breakers are functiong normally and closed.
Check the DC connection between the micro-inverters and the PV modules.
Verify the PV module DC voltage is within the allowable range shown in the Technical
Data section on page 16 of this manual.
Please call customer support at Meikai if the problem persists.
WARNING: DO NOT attempt to repair the Meikai Micro-inverter, it is unrepairable. If it
fails, please return the unit to your distributor or Meikai Customer Service for
maintenance or replacement.
Disconnect the micro-inverter from the PV module
1.
2.
3.
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Disconnect the micro-inverter from the PV module follow the steps in the order shown
open the AC circuit breaker.
Disconnect the First connector in the AC branch.
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4.
5.
6.
7.
Cover the module with an opaque cover.
Using a DC current probe, verify there is no current flowing in the DC wires between the
PV module and the Micro-inverter(make sure the current probe works correctly).
Disconnect the PV module DC wire connectors from the Micro-inverter.
Remove the Micro-inverter from the PV array racking.
Replace a Meikai Micro-inverter
Replace a Meikai micro-inverter follow the steps in the order shown
1. Disconnect the micro-inverter from the PV module follow the foresaid steps.
2. Install a new Meikai micro-inverter to the racking.
3. Connect the AC connectors of the new micro-inverter to the next micro-inverters; connect
the DC connectors to the PV module. Remove the opaque cover on the module and
complete the connection.
4. Close the AC circuit breaker to verify the operation status.
WARNING :Residual voltage exists in the inverter; the inverter cannot be maintained
within 5 minutes until the capacitor is fully discharged.
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Technical Specifications
Note: The output voltage and current of the PV module depend upon several factors such as the
number, size and temperature of the cell, and is influenced by the intensity of sunlight. The highest
voltage of a PV module is output when the cell is at the lowest temperature and circuit is open. The short
circuit current must less than or equal to the maximum DC input current of the micro-inverter.
Please make sure the output voltage and current of the PV module match with the Meikai micro-inverter.
A list of compatible PV modules is maintained on the Meikai website (http://www.meikai-cn.com).
WARNING: The maximum open circuit voltage of the PV module must not exceed the
specified maximum input voltage of the Meikai Micro-inverter.
WARNING: The maximum open circuit voltage of the PV module must not exceed the
specified maximum input voltage of the Meikai Micro-inverter.
Electrical Connection
The inverter is compatible with RCD and RCM.
The DC component may produce electricity; as a result, a residual current operated protective (RCD) or
monitoring device (RCM) will be used for protection in case of direct or indirect contact, only Type B
RCD/RCM is allowed to be connected to the supply side of the product.
Depiction
Size
A External diameter of the wire
12mm-25m
m
B Sectional area of conducting
materials
4-6mm2
C Length of bare wire
Approx.10m
m
If you choose the models without DC switch an external disconnection device should be used. It should
be multi-pole switch-disconnector(all poles disconnected simultaneously), which has been approved
according to standard IEC/EN 60947-3. The rated current should be between 20A and 25A. Besides,
AC breaker is also needed between inverter and Grid. The rated current should be over AC output
current, One branch AC breaker should be over 15A.
Technical Specifications
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Technical Specifications
Item / Model
unit
min.
normal
Max.
DC Input Data
Recommended input power
N220
N300
220
300
W
MPPT voltage range
N220
N300
Max. input DC voltage
N220
N300
Starting DC voltage
N220
N300
Max. short circuit DC current
N220
N300
Max. input DC current
N220
N300
V
30
40
V
V
input point to input point current
feedback
55
30
55
A
15
A
10
12
A
0
AC Output Data
Max. output power(-40℃~+65℃)
N220
N300
Output Power Factor
W
Nominal AC voltage range
N220
N300
Max. output AC current
N220
N300
Nominal frequency/range
N220
N300
Over high AC current protection
N220
N300
Min. time of system recovery
Vrms
200
270
205
mA
Hz
49.5
A
Minutes
0.99
1
230
253
900
1200
1100
1400
50
50.5
15
2
other working specifications
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Max. units per branch
N220
1
N300
1
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Peak inverter efficiency
N220
N300
European efficiency
N220
N300
Nominal MPP Tracking
N220
N300
Total Harmonic Distortion
N220
N300
Operating temperature
N220
N300
Relative humidity
%
95
95
%
94
94
%
99%
%
℃
3
5
-40
65
0
100%
Site altitude
2000m
Nighttime power consumption
N220
N300
mW
20
other features
Compatibility
Pairs with most 72-cell PV moudles
Dimensions(LxWxH)
228mm*136mm*33.7mm
Weight
2.5kg
Enclosure protection rating
IP65
AC Over voltage category
Category III
DC Over voltage category
Category II
Protective Class
Class I
Cooling
Natural Convection
AC cable
H05VV-F 3*2.5mm²
DC cable
PV1-F 1*4.0mm²
communication
powerline
Warranty
15 years (25 years optional)
AS 4777.2 AS4777.3 AS3100
EN 62109-1
Compliance
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Appendix
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Meikai Micro-inverter Installation Map
To Sheet
Customer information
Array:
Orientation:
Tilt:
Form /
Installer information
N/S/E/W
(circle)
Serial No.:
1
2
3
4
5
6
7
A
B
C
D
F
To Sheet
To Sheet
E
G
H
I
J
K
L
M
Version
Fax
Installation Map
To Sheet
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Quick installation Guide
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