PV Grid-connected Inverter
Digiwatts RN3000US
Installation Guide
Copyright © Renovo Power Systems. All rights reserved.
(Rev 1.1)
Reproduction and storage in a retrieval system, or transmittal, even
partially, of the contents of this manual is strictly forbidden without prior
authorization of Renovo Power Systems. All such warranties are
expressly disclaimed. Neither Renovo Power Systems nor its distributors
or dealers shall be liable for any indirect, incidental, or consequential
damages under any circumstance. (The exclusion of implied warranties
may not apply in all cases under some statutes, and thus the above
exclusion may not apply.)
Specifications are subject to change without prior notice. We make
extensive effort to make this document is complete, accurate and
receives timely updates. Readers are cautioned, however, the Renovo
Power Systems reserves the right to make changes without notice and
shall not be responsible for any damages, including indirect, incidental or
consequential damages, caused by reliance on the material presented,
including, but not limited to, omissions, typographical errors, arithmetical
errors or listing errors in the content material.
Renovo Power Systems LLC
2723 South State St., Suite 150
Ann Arbor, MI 48104
Tel: 855-RENOVO1 (736-6861) Fax: 888-810-6454
http://www.renovo-usa.com
Renovo Power Systems (Shanghai) Co., Ltd.
3rd floor , Haiye Building, No.518, Fengpu Av., Fengxian
Shanghai,China
Tel: 86-021-375 25 081*002
Fax: 86-021-375 25 082
http://www.renovo-power.com
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IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions for Model RN3000US SOLAR
INVERTERS. It must be accurately understood and followed during installation
and maintenance of the inverter. The Digiwatts system is designed according to
international safety standards, however with all electrical and electronic
equipment, installation and operation must follow some preventive measures.
To reduce the risk of electrical shock hazards and to ensure that equipment
installation and commissioning is conducted safely; all instructions, cautions and
warnings in this Installation Guide must be closely read and followed.
Warnings
A Warning describes a hazard to equipment or personnel.
It calls attention to a
procedure or practice, which, if not correctly performed or adhered to, could
result in damage to or destruction of part or all of the Renovo Power equipment
and/or other equipment connected to the Renovo Power equipment or personal
injury.
WARNING!
WARNING indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
CAUTION!
CAUTION indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
NOTICE!
The paragraphs highlighted by this symbol contain processes and
instructions that must be rigorously understood and followed to avoid
potential damage to the equipment, negative results and to ensure the
unit achieves optimal performance.
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In addition to the safety and hazard symbols described on the previous pages,
the following symbols are also used in this Installation Guide.
Make sure to
read the labels and fully understand them before installing the equipment.
INFORMATION
This symbol calls attention to supplementary information that you
should know and to ensure optimal operation of the unit.
Markings on this product
The following symbols are used as markings on this product with the following
meanings.
Warning regarding dangerous voltage
The product works with high voltages.
All work on the product may
only be done as described in the documentation.
Beware of hot surface
The product can generate heat during operation.
Avoid coming
into contact with the product during operation.
Observe the operating instructions
Read the product’s documentation before working on it. Follow all
safety precautions and instructions as described in the
documentation.
Safety criterion
ETL is the standard applied by Electrical Testing Laboratories to the
Digiwatts system to certify that it meets the requirements of the
highest safety criterion of the USA and Canada.
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General Warnings
All electrical installations must be done in accordance with the local and National
Electrical Code ANSI/NFPA70.
For installation in Canada the installations must
be done in accordance with applicable Canadian standards.
The Digiwatts unit contains no user-serviceable parts.
For all repair and
maintenance always return the unit to an authorized Renovo Power Service
Center.
Before installing or using the Digiwatts unit, read all of the instructions, cautions,
and warnings on the Digiwatts unit, the PV array and in this Installation Guide.
PV arrays produce electrical energy when exposed to light and thus can create
an electrical shock hazard. Wiring of the PV-arrays should only be performed
by qualified personnel.
According to these basic safety rules, qualified and
trained people have skills for the assembling, start-up and operation of the
product, as well as the necessary requirements and qualifications to perform
such operations.
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Table of Contents
1 Introduction........................................................................................................... 7
1.1 Validity....................................................................................................... 7
1.2 Target Group .............................................................................................. 7
1.3 Product Overview .................................................................................... 8
1.4 Feature Overview...................................................................................... 12
1.5 Safety...................................................................................................... 12
1.5.1 Protection and Criterion ........................................................................... 12
1.5.2 Safety Instructions ......................................................................... 14
1.5.3 Symbols on the Type Label ............................................................ 16
1.6 Installation Overview .................................................................................. 17
2 Unpacking and Inspection..................................................................................... 18
2.1 Scope of Delivery ...................................................................................... 20
3 AC Voltage Configuration ................................................................................. 21
4 Mounting .......................................................................................................... 21
4.1 Choosing a Mounting Location .................................................................... 22
4.2 Dimensions and Required Clearances.......................................................... 23
4.3 Mounting Procedure .................................................................................. 24
4.3.1 Mounting bracket ........................................................................ 24
4.3.1.1Mounting onto the concrete / brick wall ...................................... 25
4.3.1.2 Mounting onto the wooden wall ........................................ 27
4.3.2 Mounting the Digiwatts Unit to the Bracket........................................... 29
5 Wiring the Digiwatts unit .................................................................................. 30
5.1 Sequence of Connecting ............................................................................ 32
5.2 Opening the Digiwatts ................................................................................ 33
5.3 Wiring the AC Output ................................................................................. 34
5.3.1 AC Connection Requirement............................................................. 34
5.3.2 Connecting the AC Wires ................................................................. 35
5.4 Wiring the DC input.................................................................................... 36
5.4.1 DC Connection Requirements........................................................... 36
5.4.2 Connecting the DC Wires ................................................................. 39
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5.5 Communication Wiring ............................................................................... 39
5.5.1 RS485 Communication .................................................................... 39
5.5.2 Network communication.............................................................. 41
5.6 Closing the Digiwatts unit............................................................................ 41
6 Commissioning ................................................................................................ 42
7 Displays and Messages ................................................................................... 44
7.1 LED Operation Indications .......................................................................... 44
7.2 Status Messages on the LCD Display........................................................... 45
7.2.1 Activation of the LCD Backlight ................................................... 45
7.2.2 Switching interface ...................................................................... 45
7.2.3 Operation interface...................................................................... 45
7.2.4 Time-power curve interface ......................................................... 46
8 Troubleshooting ............................................................................................... 47
8.1 General.................................................................................................... 47
8.2 Error Messages......................................................................................... 49
9 Technical Specifications ................................................................................... 51
9.1 Specifications............................................................................................ 51
9.2 Trip Limits / Trip Times ............................................................................... 52
9.3 Torque Values and Wire Sizes .................................................................... 52
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1 Introduction
1.1 Validity
This manual describes the assembly, installation, commissioning and
troubleshooting of the following Renovo inverter: Digiwatts RN3000US.
Information
To help avoid problems during the installation, familiarize yourself with
the installation process by reading the entire Installation Guide before
starting the installation.
WARNING!
Lethal voltages are present at various points in a PV system.
For
safety reasons, it is recommended that only qualified personnel can
install and operate this equipment.
Read and understand all the instructions contained in this manual and become
familiar with the safety symbols in the relevant paragraphs before you install and
commission the equipment.
1.2 Target Group
This manual is for qualified electricians. The tasks described in this manual may
be performed by electrically qualified persons only.
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1.3 Product Overview

Basic information
The Digiwatts inverter is used to convert DC power generated by the PV arrays
into stable AC power for output to the utility grid. The Digiwatts system is a
transformerless inverter and performs this conversion in a very efficient way,
without moving components, using only solid state power electronic devices.
It is a crucial unit in the small-scale PV power system.
An example of basic PV power system components is shown in the Figure 1-1.
PV Array
Utility Grid
Digiwatts
Meter
Figure 1-1: Digiwatts System is installed in a Utility Interactive PV System
Information
Policies vary from one utility company to another. Consult with a
representative of the local utility company before designing and installing
a PV system.
NOTICE!
Any other or additional use is not permitted except the intended use.
The inverter must only be connected to public utility grid. If output of
inverter is connected to local loads (household appliance, lights, motor
loads, etc.) the inverter will not start.
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
Electrical block diagram
Figure 1-2 shows the main circuit of Digiwatts transformerless grid-connected
inverter system. A boost circuit raises input DC voltage within the inverter.
Then a Maximum Power Point (MPP) tracker ensures that maximum power is
extracted from the PV arrays. Afterwards, a full bridge inverter circuit converts
DC power to AC power which is then output from the unit.
Full bridge
Boost
DC+
Relay1
Relay2
L
N
DC-
DSP1
DSP2
LCD
Figure 1-2 Electrical Block Diagram
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
Terminals of the Digiwatts system
4
5
1
6
2
7
3
8
Figure 1-3 Terminals Description
Table 1-1 Terminals Description
Item
1
2
3
4
5
6
7
8
Name
DC input
DC input
Network terminal
LCD screen
Switch
AC output
AC output
RS485 terminal
Installation Guide
Description
Input port for 1/2 inch conduit
Input port for 3/4 inch conduit
Standard network interface - CAT5/RJ45
Running data is displayed on the LCD screen
Disconnect inverter from PV array and power grid
Output port for 1/2 inch conduit
Output port for 3/4 inch conduit
Standard communication interface
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
Dimensions and weight
Figure 1-4 Dimensions of the Digiwatts unit
Table 1-2 Dimensions and weight
Type
RN3000US
Depth
Width
Height
Weight
(mm/Inch)
(mm/Inch)
(mm/Inch)
(kg/lb.)
195/ 7.7
459 / 18.1
490 / 19.3
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1.4 Feature Overview
The Digiwatts system represents state-of-the-art technology. Several key
features:

High reliability and safety

High efficiency

Simple installation

Quiet operation

LCD Display

Powder coated die-cast enclosure
Operating Temperature
The Digiwatts system has been equipped with a passive radiator used to
maintain full power output at ambient temperatures as high as 60°C.
NOTICE!
Although the Digiwatts unit can be installed where temperatures reach up
to 60°C, it is strongly recommend that it be installed where ambient
temperature in the range of 0~40°C.
1.5 Safety
1.5.1 Protection and Criterion
Anti-Islanding Protection
Islanding is a condition that can occur if the utility grid is disconnected while the
Digiwatts system is operating and the remaining load is resonant at 60 Hz and
matches the output of the Digiwatts perfectly.
The Digiwatts system
incorporates an advanced active islanding protection algorithm to ensure that the
system will not export power into a balanced 60 Hz resonant load while the utility
is disconnected.
The Digiwatts system periodically injects both leading and
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lagging reactive current into the utility grid.
This method has been proven by
independent test labs to effectively destabilize and disconnect from a balanced
island condition.
PV Insulation Fault Detection
Before the inverter connects to the grid, the Digiwatts system will detect the
isolation of PV+ and PV- to the ground. When the insulate impedance is less
than 1MΩ, the inverter will not function. After the inverter is connected to the
grid, the system will detect the residual current. If a residual current greater than
30mA is detected, the Digiwatts system will shut down and display a fault
condition on the LCD user interface display.
AC Overcurrent Protection
The system will detect the AC current real time. Should the AC current exceed
20 ampere, the Digiwatts system will shut down and display a fault condition on
the LCD user interface display.
Safety criterion
ETL is the standard applied by Electrical Testing Laboratories to the
Digiwatts system to certify that it meets the requirements of the
highest safety criterion of the USA and Canada.
The Digiwatts system has been tested and listed by ETL to meet the
requirements of UL1741 Static Inverters and IEEE 1547 Standard for
Interconnecting Distributed Resources with Electric Power Systems.
The Digiwatts system is also listed under CSA Std C22.2 No.107.1-01.
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1.5.2 Safety Instructions
DANGER
Danger to life due to high voltages in the inverter!

All work on the inverter may only be carried out by qualified
personnel.

The appliance is not to be used by children or persons with reduced
physical, sensory or mental capabilities, or lack of experience and
knowledge, unless they have been given supervision or instruction.

Children should be supervised to ensure that they do not play with
the appliance.
CAUTION
Risk of Burn Injuries!
Parts of the enclosure can become hot. The product can generate heat
during operation. Avoid coming into contact with the product during
operation.
CAUTION
Possible damage to health as a result of the effects of electro-magnetic
radiation! Do not stay closer than 20 cm to the inverter for an extended
of time.
CAUTION
Risk of Electric Shock!
Do not remove cover. No user serviceable parts inside. Refer servicing to
qualified service personnel.
CAUTION
Risk of Electric Shock!
 Both AC and DC voltage sources are terminated inside this
equipment. Each circuit must be individually disconnected before
servicing.
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
When the photovoltaic array is exposed to light, it supplies a DC
voltage to this equipment.
WARNING
For continued protection against fire, replace fuses only with units of
same type and ratings.
CAUTION
Risk of electric shock form energy stored in capacitor!
Do not remove cover until 15 minutes after disconnecting all sources of
supply.
CAUTION
The Digiwatts system shall not be connected to a battery due to lack of
over- current protection provided in the unit.
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1.5.3 Symbols on the Type Label
Table1-3 Symbols on the Type Label
Icon
Explanation
The product works with high voltages. All work on
the product may only be done as described in the
documentation.
The product can generate heat during operation.
Avoid coming into contact with the product during
operation.
Read the product’s documentation before working
on it. Follow all safety precautions and instructions
as described in the documentation.
The inverter can be installed outdoors.
Direct Current (DC)
Alternating Current (AC)
Certified Safety
The inverter complies with the requirements of
Equipment and Product Safety Acts in USA and
Canada.
Symbol for equipment grounding conductor.
The inverter is transformerless.
Do not touch the inverter when it is operating.
The inverter need 15 minutes to discharge when
stops operating.
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1.6 Installation Overview
This section provides an overview of the installation process and User Manual
contents.
Section 1: Unpacking and Inspection
Provides instructions for unpacking and inspecting the Digiwatts system for
shipping damage.
Section 2: General Use
Read this manual carefully before using this product. If you encounter any
problem during installing or running this unit, please check this manual first before
contacting your local dealer or representative. Many problems encountered can
be solved according to the instructions inside.
Section 3: Mounting
 Provides guidelines for the best mounting location and detailed mounting
instructions to insure optimum performance,
 Cautions and warnings to be followed to avoid injury and/or equipment
damage.
Section 4: Wiring
 Guidelines for selecting the correct wire sizes
 Cautions and warnings that should be followed to avoid injury and/or
equipment damage
 Step-by-step instructions for wiring the Digiwatts system to a PV array and the
utility grid
 Procedures for connecting optional data-communication cables
Section 5: Commissioning
Commissioning involves applying DC input power to the Digiwatts unit and
resolving any problems that occur.
Section 6: Displays and Messages
Provides screen display information, meanings and how to determine faults.
Section 7: Troubleshooting
Provides troubleshooting tips and procedures for resolving problems that may
occur during installation and operation.
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Section 8: Technical Specifications
Provides functional technical data plus connection diagrams and torque
specifications for the connection of cables and fasteners of the Digiwatts unit.
2 Unpacking and Inspection
NOTICE!
The distributor delivered your Digiwatts unit to the carrier fully functional and
securely packaged.
Upon acceptance of the package, the carrier assumes
responsibility for its safe delivery.
In spite of careful handling, transport
damage to package or its contents is always a possibility.

Inspect the shipping box for apparent damage, such as holes, tears or any
other sign of possible damage to its contents.

Describe any damage or shortage on the receiving documents, making sure
to obtain the carrier acknowledgment with his/her full signature.

Open the shipping box and inspect the contents for internal damage.
unpacking, be careful not to discard any equipment, parts or manuals.
While
If
any damage is detected, call the delivering carrier to determine the
appropriate action.
Save all shipping material in the event the carrier sends
an inspector to verify damage!

If the inspection reveals damage to the inverter call your supplier, or
authorized distributor.
They will determine if the equipment should be
returned for repair and provide instructions to process if required.

It is the customer's responsibility to file a claim with the carrier. Failure to
file a claim with the carrier may void all warranty service rights for any
damage.

If it becomes necessary to return the Digiwatts unit, use the original
packaging in which it was delivered.
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WARNING!
The Digiwatts unit weighs up to 27kg. To avoid injury, be sure to use
proper lifting techniques and secure the help of someone to assist in the
unpacking and installation of the inverter.
If you need assistance with a damaged Digiwatts unit, contact Renovo Power.
Contact information for Renovo Power Systems is provided below.
North America:
Renovo Power Systems LLC
2723 South State St., Suite 150
Ann Arbor, MI 48104
Tel: 855-RENOVO1 (736-6861) Fax: 888-810-6454
http://www.renovo-usa.com
Asia:
Renovo Power Systems (Shanghai) Co., Ltd.
3rd floor , Haiye Building, No.518, Fengpu Av., Fengxian
Shanghai,China
Tel: 86-021-375 25 081*002 Fax: 86-021-375 25
082http://www.renovo-power.com
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2.1 Scope of Delivery
Table 2-1 Delivery Contents
Item
A
B
C
D
E
F
Qty.
1
1
2
3
4
8
Description
RN3000US
Bracket
Cross Bars
Expansion screws
M6 wood screws
M6 machine screws
G
H
I
1
1
1
User manual
Product test report
Warranty card
Note
Digiwatts Inverter unit
Mount inverter onto the wall
Optional hardware for stud wall
Fasten Bracket onto the masonry wall
Fasten Cross Bars onto stud wall
Fasten bracket onto the cross bars
Fasten Digiwatts Inverter unit onto the bracket
Installation and operation instructions
-
J
1
Packing list
-
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3 AC Voltage Configuration
The Digiwatts system is compatible with 240V AC output.
The Digiwatts unit
comes from the factory pre-configured for utility interconnection at 240V AC.
Figure 3-1: Common Utility Voltage Configurations
Information
When using 240 V Delta Corner grounded grids, connect the N terminal
to the grounded corner.
4 Mounting
This section provides guidelines to help you select the best mounting location,
suggestions to insure best performance, cautions and warnings that you should
follow to avoid injury and/or equipment damage, and step-by-step instructions
for mounting a Digiwatts inverter.
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WARNING!
The Digiwatts unit weighs up to 27 kg.
To avoid injury, be sure to use
proper lifting techniques and secure the help of someone to assist in the
unpacking and installation of the inverter.
Information
It is required that the inverter be mounted so that the rating label on the
side of the inverter is visible.
4.1 Choosing a Mounting Location
Consider the following guidelines, cautions, and warnings when choosing a
mounting location for the Digiwatts unit.
WARNING!
Danger to life due to fire or explosion. Do not install the inverter on
flammable construction materials, in areas where highly flammable
materials are stored or in potentially explosive areas!
CAUTION!
The Digiwatts unit weighs up to 27kg. Ensure that the mounting surface
sufficiently sturdy to hold the weight of the Digiwatts. Do not mount the
Digiwatts on plasterboard (sheet-rock) or thin wood paneling.
NOTICE!
This unit is designed for indoor or outdoor usage. But it is suggested
that the unit not be exposed to rain or water directly and use of a shelter
to protect the unit would be preferred. Do not expose this unit to the sun
directly. This may reduce the output power due to high temperature.

Mount the inverter at proper height from ground level to ensure that
display and status LEDs are easy to read, at least 1000mm from ground.

The inverter should be installed in a location that is inaccessible to
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children.

The Digiwatts unit emits a slight vibrating noise when operating.
This
vibration is normal and has no effect on performance, but it can be
objectionable if the inverter is mounted on a wall in a living area, on the
outside of a wall that is near a living area, or on certain types of materials,
such as thin wood paneling or sheet metal.

Install the Digiwatts unit in a location that maintains an ambient air
temperature less than 60°C to maintain a safe internal component
temperature.

If the inverter is installed outside, it should be mounted vertically (see
Figure 4-1).
Figure 4-1 Digiwatts unit mounting positions
4.2 Dimensions and Required Clearances
CAUTION!
If you are installing the Digiwatts unit in a cabinet, closet, or other
relative enclosed area, sufficient air circulation must be provided to
dissipate the heat generated by the inverter.
Figure 4-2 shows the outer dimensions of the Digiwatts unit. The unit
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must be mounted with a clearance of at least 50cm at all points, but
100cm bottom side.
Figure 4-2 the outer dimensions of the Digiwatts unit
Information
You must ensure that there is sufficient clearance for the flow of the air
around the Digiwatts unit! In a normal operating environment with good
ventilation, 50 cm of clearance is sufficient. The National Electrical Code
may require increased working clearances.
4.3 Mounting Procedure
4.3.1 Mounting bracket
The Digiwatts unit is shipped with expansion screws suitable for use on concrete,
masonry, brick or solid walls. And with wooden screws suitable for use on
wooden wall. Make sure that the wall you choose to mount the Digiwatts unit on
is sturdy enough to support its weight (27 kg) over a long period of time and that
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the wall is plumb. Be sure to use the appropriate type of mounting hardware for
the wall material.
4.3.1.1 Mounting onto the concrete / brick wall
Figure 4-3 Dimensions of the Wall Mounting Bracket
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1
2
3
4
5
6
Figure 4-4 Fasten the Bracket against Masonry Wall with Expansion Screws
Table 4-1 Mounting Items
Item
1
2
3
4
5
6
Description
Masonry wall
Expansion cylinder
Bracket
Washer
Spring washer
Hexagonal nut
Mounting the expansion screws:
Three fasteners are required to secure the wall mounting bracket to a wall: Two
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fasteners along the top of bracket using the center holes on each side (centerline
spacing of 180mm) and a third fastener at the centerline of the bottom of the
bracket (Expansion screws are provided however it is installer’s responsibility to
ensure fasteners to bw appropriate for wall material.) Ensure that all fasteners are
well secured.
4.3.1.2 Mounting onto a stud wall
Fasten the Cross Bar
Figure 4-5 Dimensions of the Cross Bar
Figure 4-6 Fasten the Cross Bar against stud wall with wood screw
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Two fasteners are required to secure each of the cross bar to a stud wall. The
fasteners must be fastened on the wood stud of the wall. Fastener holes of cross
bars must be aligned on vertical direction. The vertical distance between cross
bars is 210mm. (Wood screws are provided however it is installer’s responsibility
to ensure fasteners to be appropriate for wall material.)
Mounting the bracket to the cross bars
Six M6 machine screws are required to secure the bracket to the cross bars.
1
2
3
4
5
6
Figure 4-7 Fasten the Bracket against Masonry Wall with Expansion Screws
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Table 4-2 Mounting Items
Item
1
2
3
4
5
6
Description
Stud wall
Cross Bars
Bracket
M6 washer
M6 spring washer
MS machine screw
4.3.2 Mounting the Digiwatts Unit to the Bracket
Use the following procedure to mount the Digiwatts unit once wall bracket is
secured to the wall.
1) Carefully hook the slots on the rear of the Digiwatts case onto
corresponding vertical tabs of the wall bracket.
Figure 4-8 Mounting the Inverter to Bracket
WARNING!
The Digiwatts unit weighs up to 27 kg. To avoid injury, be sure to use
proper lifting techniques and secure the help of someone to assist in the
unpacking and installation of the inverter.
2) Secure the bottom tabs protruding from the bottom of the Digiwatts units to
the bracket using two M6 machine screws and a lock. (The lock is not in the
scope of delivery. The user should obtain a lock as necessary for security. )
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Lock (optional)
M6 machine screw
Figure 4-9 Affix Bottom Tabs of Digiwatts unit to Mounting Bracket
3) Inspect the Digiwatts unit from both sides to ensure that it sits centered on
the wall screws.
4) Carefully verify that the Digiwatts unit is mounted firmly in place.
5 Wiring the Digiwatts unit
This section provides step-by-step procedures and other information required
for wiring the Digiwatts unit to the PV array and the utility grid. To complete the
installation in a safe and efficient manner, complete the steps in the order that
they appear.
WARNING!
Before connecting or operating the Digiwatts unit, read all of the
instructions, cautions, and warnings on the Digiwatts unit, the PV array
and in this Installation Guide.
WARNING!
You must connect the wires that carry the AC voltage from the Digiwatts
unit to the utility grid and the wires that carry the DC voltage from the PV
array to the Digiwatts unit in the order described in the procedures in this
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section.
Deviating from these procedures could expose you to lethal
voltage.
WARNING!
Always turn OFF all switches in the PV system before connecting any
wires to or disconnecting any wires from the Digiwatts unit.
Information
The DC input and AC output circuits are isolated from the enclosure and
system grounding, as required by section 250 of the National Electric
Code, ANSI/NFPA 70. Similarly, such isolation of DC input and AC
output circuits from enclosure and system grounding is also required by
the CANADIAN ELECTRICAL CODE, PART 1. It is the responsibility
of the installer to maintain this isolation.
The Photovoltaic System Grounding shall be installed per the
requirements of sections 690.41 through 690.47 of the National Electric
Code, ANSI/NFPA 70.
It is the responsibility of the installer to meet
these requirements.
AC Grounding
The Digiwatts unit must be connected to the AC ground from the utility via the
Ground Terminal. Use 8AWG-12AWG, 105°C, copper wire for AC grounding.
PV Grounding
The PV array ground should be connected to the PV Grounding and DC
Grounding Electrode Conductor. Use 8AWG-10AWG, 105°C, copper wire for PV
grounding.
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5.1 Sequence of Connecting
Figure 5-1 Electrical Connection Diagram
1) De-energize all energy sources by opening all AC and DC disconnects
and/or breakers.
2) Wire from AC breaker to the Digiwatts unit.
3) Wire from the PV DC breaker to the Digiwatts unit .
4) Turn the DC switches and/or breakers ON.
5) Turn the AC switches and/or breakers ON.
6) To disconnect the Digiwatts unit, first turn OFF all AC breakers and then all
DC breakers. The AC system should always be disconnected before the
DC system.
WARNING!
Always wait a minimum of 15 minutes for stored potentials in the Digiwatts
unit to discharge completely before opening the enclosure.
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5.2 Opening the Digiwatts
ON
ON
OFF
OFF
Figure 5-2 (a) Turn the switch to off position
Figure 5-2 (b) Opening the Digiwatts unit
1) Turn the switch to OFF position.
2) Remove the four machine screws and lock washers from the disconnect
housing cover.
3) Open the cover smoothly.
CAUTION!
Be careful not to misplace the machine screws or the lock washers, as
all four screws and lock washers are required to ensure that the cover is
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grounded properly and is fully sealed to the case. Handle the cover
carefully, as even seemingly minor damage to the cover could result in
an inadequate seal between the cover and the case, thus allowing
moisture to enter the case and damage the sensitive electronic
components.
NOTICE!
Do not install the Digiwatts unit during periods of precipitation or high
humidity (>95%). Moisture trapped within the enclosure may cause
corrosion and damage to the electronic components.
5.3 Wiring the AC Output
This subsection provides complete, step-by-step procedures for wiring the AC
output from the Digiwatts unit to the utility grid.
5.3.1 AC Connection Requirement
WARNING!
All electrical installations must be done in accordance with all local
electrical codes and with the National Electrical Code (NEC),
ANSI/NFPA 70.
Use #8AWG-12AWG, 105°C, copper wire for all AC
wiring connections to the Digiwatts. Voltage drop and other
considerations may dictate that larger size wires be used.
Use only
solid or stranded wire but not fine stranded wire.
WARNING!
The National Electrical Code (NEC) states that the inverter must be
connected to a dedicated circuit, and that no other outlets or devices
can be connected to the same circuit. See NEC Section 690-64(b) (1).
The NEC also imposes limitations on the size of the inverter and the
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manner in which it is connected to the utility grid. See NEC Section
690-64(b)(2).
WARNING!
To reduce the risk of fire, connect only to a circuit provided with the
required branch circuit over-current device sized in accordance with the
National Electric Code, ANSI/NFPA 70.
The maximum size
over-current device shall not be more than 50 amperes.
WARNING!
You must connect the wires that carry the AC voltage from the Digiwatts
unit to the utility grid in the order described in this procedure.
Deviating
from this procedure could expose you to lethal voltages that can cause
serious injury and/or death.
5.3.2 Connecting the AC Wires
1) Turn OFF the main breaker in the main utility breaker box.
2) Remove the disconnect housing cover.
3) If you are replacing an existing inverter, disconnect the wires for the AC
line you are working within the breaker box.
4) Pull the AC wires through the conduit from the interior AC terminal of the
Digiwatts unit.
5) Connect the AC equipment-ground wire to the PE terminal labeled
within the Digiwatts unit.
6) Connect the L1 and L2 wires to the terminals.
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L1
L2
Ground
Figure 5-3 AC Connection Terminals
5.4 Wiring the DC input
This subsection provides procedures for wiring the DC input from the PV array
to the Digiwatts unit.
5.4.1 DC Connection Requirements
WARNING!
All electrical installations must be done in accordance with all local
electrical codes and with the National Electrical Code (NEC),
ANSI/NFPA 70.
For installation in Canada the installations must be
done in accordance with applicable Canadian standards.
WARNING!
Use #8 AWG-10AWG, 105 °C, copper wire for all DC wiring connections
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to the Digiwatts.
Voltage drop and other considerations may dictate
that larger size wires be used. Use only solid or stranded wire but not
fine stranded wire.
WARNING!
The DC disconnect for the inverter must have a minimum rating of
600VDC and 25A continuous.
Information
Series fusing may be required depending on the type of PV module used
in the system. See NEC 690.9.
WARNING!
You must connect the wires that carry the DC voltage from the PV array to the
Digiwatts unit in the order described in the following procedure. Deviating from
this procedure could expose you to lethal voltages that can cause serious injury
and/or death.
WARNING!
PV arrays are energized when exposed to light. Use safe working
practices when working on PV arrays.
WARNING!
Always turn OFF all AC and DC breakers and switches in the PV system
and wait a minimum of 15 minutes for the Digiwatts unit to completely
discharge before connecting any wires to the Digiwatts unit or
disconnecting any wires from the Digiwatts unit.
Failure to do so could
expose you to lethal voltages that can cause serious injury and/or death.
CAUTION!
Verify the polarity and the open-circuit voltage from the PV strings before
you connect the DC wires to the Digiwatts unit.
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Applying an open-circuit
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DC-input voltage that exceeds the maximum DC-input-voltage range will
cause irreversible damage to the Digiwatts unit and void the warranty!
Always configure the DC-input-voltage range correctly before connecting
the DC-input wires from the PV array to the Digiwatts unit.

The PV modules connected to Digiwatts unit should be:
---Same type
---Identical alignment
---Identical tilt

The maximum length of DC connecting cables should not exceed 30m as
required by the EMC Directive.

The following limit values at the DC input of the inverter must not be
exceeded:
Maximum input voltage
550V
Maximum input current
18 A
WARNING!
Verify that the DC current of your installation does not exceed the
maximum values specified in the rating label.
Check both the
polarity and the open-circuit voltage from the PV strings
Negative Positive +
Ground
Figure 5-4 DC Connection Terminals
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CAUTION!
Avoid using wire nuts to for any connections in the PV system. Wire
nuts are a frequent cause of unreliable, resistive connections, and ground
faults.
5.4.2 Connecting the DC Wires
1) Verify that the AC breaker(s) are OFF.
2) Verify that the DC breaker is OFF.
3) Pull the DC wires from the DC breaker through the conduit into the interior
of the Digiwatts unit.
4) Connect the positive and negative DC wire to the terminal labeled DC+
and DC- in the Digiwatts unit.
5) Connect the PV array ground wire to the PE terminal labeled
within
the Digiwatts unit.
6) Pull on the cables in order to make sure that they are sufficiently secured
within the terminals.
5.5 Communication Wiring
The inverter provides RS485 interface and network interface to communicate with
remote PC or Internet. User can monitor the state of the inverter and observe
real-time and historical functional information via this interface.
WARNING!

The RS485 cable should not be longer than 1200 meters with a
common shield and a wire size no smaller than 24 AWG.

The network cable between two devices should not be longer than
50 meters.
5.5.1 RS485 Communication
RS485 is a communication standard for bidirectional transmission of data
between one or more Digiwatts units and a PC.
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Figure 5-6 Communication Wiring
Wiring procedure:
1) A resistance with 120Ω is connected at the initiating terminal of RS485
bus.
2) Plug the connector of the RS485 cable into corresponding RS485 terminal
of Inverter 1
3) The two lines of the other end of RS485 cable, labeled A and B, are
connected to corresponding lines of RS485 bus, as the above diagram.
4) Connect other inverters to RS485 bus in the same way.
5) At the end of RS485 bus, connect RS485 A cable to “RX+” port of
RS232-RS485 converter and connect RS485 B cable to “TX-” port of
RS232-RS485 converter
6) Connect RS232 port of RS485-232 converter to RS232 port of PC.
Information
All Digiwatts inverters are capable of RS485 communication.
You can
mix different Digiwatts models on a single RS485 communication bus.
NOTICE!
RS485 bus requirements to ensure quality of communication:

Shielding twist-pair type

Shielding layer of RS485 bus should be single-point grounding to
avoid ground loops.
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5.5.2 Network communication
You can connect inverter to Internet or PC by router (the router is not specified,
you can get any brand or model in the market).
Wiring procedure:
1) Connect the router to PC and internet.
2) Configure the router via PC.
3) Connect the inverter to router.
5.6 Closing the Digiwatts unit
When you have finished connecting the AC-output wires, the DC-input wires,
re-check all your connections to ensure that everything is in the right place and
that all connections and knockout fittings are secure. Check all of the knockout
fittings on the bottom of the Digiwatts unit to ensure that they provide a
weather-tight seal.
WARNING!
Never install the Digiwatts unit during rain or very damp conditions.
Because the Digiwatts unit is completely sealed, you must be sure no
moisture is trapped inside the enclosure when securing the lid.
CAUTION!
Be careful not to misplace the machine screws or the gland that attach
the cover to the case, as all four screws and gland are required to ensure
that the cover is grounded properly and is fully sealed to the case.
Handle the cover carefully, as even seemingly minor damage to the cover
could result in an inadequate seal between the cover and the case, thus
allowing moisture to enter the case and damage the sensitive electronic
components.
Use the following procedure to replace the cover on the Digiwatts unit:
1) Check wire routing to ensure that no wires can interfere with proper
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sealing of the cover and that no pressure will be exerted on the
connections when the cover is replaced.
2) Locate the four machine screws and gland you removed to take the cover
off the Digiwatts unit. Make sure you have all four screws and gland, as all
of this hardware is necessary to ensure proper grounding and a
weather-tight seal.
3) Check the seal on the inside of the cover to ensure it is undamaged and in
the correct position.
4) Carefully position the cover on the front of the Digiwatts unit so that the
four holes in the cover are aligned correctly with the four threaded holes in
the case.
5) While holding the cover in place, carefully insert the four machine screws
with lock washer, through the holes in the cover into threaded holes in the
case and turn them until they are finger-tight.
Be careful not to
cross-thread any of the screws. Do not use power tools to start the screws.
6) Verify that the cover is in the correct position and that the seal is in place
between the case and the cover.
7) Tighten the cover screws.
6 Commissioning
WARNING!
Follow the steps in the commissioning procedure in the order they are
presented.
Deviating from these procedures could expose you to lethal
voltages that can cause serious injury and/or death.
CAUTION!
Follow the steps in the commissioning procedure in the order they are
presented. Deviating from these procedures could cause irreversible
damage to the Digiwatts unit and void the warranty.
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Observe the operating instructions
To commission the Digiwatts unit, follow these instructions:
1) Make sure any covering placed over the PV array is removed.
2) Connect the grid voltage to Digiwatts unit by switching on main AC circuit
breaker.
3) Connect the external DC.
If there is sufficient sunlight available, the
Digiwatts unit will enter the “Wait” mode at this time and the Wait LED will
begin to blink.
4) If no AC faults are detected, the “Wait” mode will end after 30 seconds and
the Wait LED will stop blinking, the Digiwatts unit will begin to operate
normally.
If an AC fault was registered, the Digiwatts unit will wait 5
minutes prior to starting.
Information
If the Digiwatts unit is not operating as expected after the commissioning
procedure has been completed, refer to section 7 and 8.
Information
If there is adequate solar irradiation and the resulting PV input voltage is
greater than 150V DC, the Digiwatts unit will automatically begin feeding
power to the utility grid.
Information
The Digiwatts unit operates from the power produced by the PV array
and is designed for minimal internal DC-power consumption.
The
maximum power that the Digiwatts unit will consume in normal operation
is 8W.
Information
Anytime the AC power is disconnected from the inverter, either manually
or as a result of an AC disturbance, the inverter will wait 5 minutes after
the AC power has been restored to reconnect.
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7 Displays and Messages
7.1 LED Operation Indications
Figure 7-1 Front Cover LED Status Indicators
Waiting The Wait LED is blinking, the other two are off.
The PV energy is sufficient to enable self-checking, but is insufficient for feeding
power to the utility grid.
Normal Operation The Run LED is on, the other two are off.
The inverter has determined that there is enough voltage from the array to
operate. The Digiwatts unit adjusts the voltage and current from the PV array to
maximize PV output power.
Fault mode The Stop LED is on, the other two are off.
The inverter has determined that failures occurred, either inside the inverter or
somewhere in the PV system or power grid. The inverter will not operate until failures are
eliminated.
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7.2 Status Messages on the LCD Display
7.2.1 Activation of the LCD Backlight
The LCD backlight is activated by knocking on the lid. The backlight shuts off
automatically after 1 minute.
7.2.2 Switching interface
The interface can be switched by knocking on the lid while the backlight is
activated. The interface can be switched between Operation Interface and
Time-Power Curve Interface.
7.2.3 Operation interface
Figure 7-2 Operation interface
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Table 7-1 Operation Interface Descriptions
Item
Parameter
Description
1
Fault
Fault messages (only appears if fault condition)
2
Notice
3
Input current
PV input current
4
Input voltage
PV input voltage
5
Power
Power feeding to grid
6
E-Day
Energy generated for the day
7
E-Total
Total energy generated since installation
8
Output voltage
Voltage feeding to grid
9
Output current
Current feeding to grid
Special status messages (Overheated, low-power
operating, etc.) (only appears if notice condition)
7.2.4 Time-Power curve interface
Figure 7-3 Time-Power curve
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Table 7-2 Time-Power curve interface description
Item
Parameter
Description
1
Y-axis
Power feeding to grid
2
Max. power point
3
4
Time-Power curve
X-axis
Present max. power point ( The first figure is
time, the second is power )
A curve represents the variation of power with
time
Inverter running time of the day
8 Troubleshooting
8.1 General
Our quality control program assures that each inverter is manufactured to exact
specifications and is thoroughly verified prior to leaving the factory. In the
unlikely event difficulty is encountered with the operation of the inverter, follow
the steps below to correct the problem.
1. Check & record the exact “Mode” and/or “Fault” messages on the LCD
display.
2. Check the DC and AC voltages at terminals inside the inverter. Be sure to
observe all of the safety precautions listed throughout this manual when
doing so, or hire a qualified professional.
3. If the system problem persists, contact RENOVO POWER technical support
at: 855-RENOVO1 (736-6861)
In order to better assist you when contacting RENOVO POWER, please provide
the following information:
Required Information for Digiwatts Unit Service:
 Serial number
 Model number
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
Short description of the problem

Display message

What error code is indicated?

AC line voltage

DC line voltage

Can you reproduce the failure?

Has this problem occurred in the past?

What were the ambient conditions when the problem occurred?
If yes, how?
Information Regarding the PV Modules:

Manufacturer name and model number of the PV module

Output power of the module

Open circuit voltage (Voc) of the module

Number of modules in each string
If it becomes necessary to send the Digiwatts unit back to the manufacturer for
service, please ship it in the original packaging to avoid damage during shipping.
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8.2 Error Messages
If a fault occurs, the Digiwatts system generates an error message according to
the operating mode and the detected fault.
Table 8-1 Fault code
Faults detected by main DSP
Fault code
Description
M_BOOST
Boost error
M_Freq_H
Frequency of grid is too high
M_Freq_L
Frequency of grid is too low
M_Idc_H
DC current of grid is too high
M_Iga_H
Instantaneous value of AC current is too high
M_IGBT
IGBT error
M_IgR_H
RMS value of AC current is too high
M_Iin_H
Input current is too high
M_Iin_Sensor
Input current sensor error
M_Ilost_H
Residual current is too high
M_Ilost_S
Residual current sensor error
M_ISO
Insulation resistance is too low
M_Iso_Relay
Insulation detection circuit error
M_Over_load
Over-load
M_Pll
Phase-locked loop error
M_Power_H
Running power is too high
M_PV_UNSTA
PV input is unstable
M_RELAY
Relay error
M_RESTART
Coercively restart
M_S_MON
Monitoring error
M_SPI_Err
SPI communication error
M_Temp_H
Temperature is too high
M_Tmep_L
Temperature is too low
M_Udc_H
DC bus voltage is too high
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M_Udc_L
DC bus voltage is too low
M_Uga_H
Grid voltage is too high
M_Uga_L
Grid voltage is too low
M_Vin_H
Input voltage is too high
M_Vin_L
Input voltage is too low
M_Vin_Vdc
Input voltage and DC bus voltage comparison error
Faults detected by slave DSP
S_ Cmp _Idc
DC component comparison error
S_ Cmp _Ilost
Residual current comparison error
S_ Cmp _IpvIN
Input current comparison error
S_ Cmp _Temp
Temperature comparison error
S_ Cmp _UdcIN
DC bus voltage comparison error
S_ Cmp _UpvIN
Input voltage comparison error
S_ Cmp_Ig
Grid current comparison error
S_ Cmp_Ug
Grid voltage comparison error
S_Freq_H
Frequency of grid is too high
S_Freq_L
Frequency of grid is too low
S_Idc_H
DC current of grid is too high
S_Iga_H
Instantaneous value of AC current is too high
S_IgR_H
RMS value of output AC current is too high
S_Iin_H
Input current is too high
S_Ilost_H
Residual current is too high
S_Power_H
Running power is too high
S_Temp_H
Temperature is too high
S_Temp_L
Temperature is too low
S_Udc_H
DC bus voltage is too high
S_Udc_L
DC bus voltage is too low
S_Uga_H
Grid voltage is too high
S_Uga_L
Grid voltage is too low
S_Vin_H
Input voltage is too high
S_Vin_L
Input voltage is too low
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9 Technical Specifications
9.1 Specifications
Item
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
Description
Maximum input voltage (DC)
Input voltage range(DC)
Maximum input current(DC)
Output power factor rating (AC)
Output voltage range(AC)
Operating freq. range or single freq.
Rated output voltage (AC)
Rated output frequency
Maximum continuous output current (AC)
Maximum continuous output power (AC)
Peak Power Tracking voltage(DC)
Start-up input voltage(DC)
Precision of voltage
Precision of current
Precision of frequency
Peak inverter efficiency
Ingress protection
R
Material of enclosure
S
Dimensions
T
Weight
U
Ambient temperature range
V
Power consumption
Installation Guide
Specification
550V
100-550V
16A
>0.99
211-264V
59.3-60.5Hz
240V
60Hz
12.5A
3200W
200–440 V
150V
1V
0.1A
0.01Hz
97%
Type 3R
1.5mm stainless steel
sheet
H x W xD (mm) 490 x 459 x 195
(in) 19.3' x 18.1' x 7.7'
27 kg / 59 lb
−20°C to 60 °C
−14°F to 140°F
0 W nighttime,
≤ 8W operating
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9.2 Trip Limits / Trip Times
Nominal
Freq. (Hz)
Trip Limit (Hz)
60
Trip Times (s)
>60.5
60.45 - 60.55
max. 0.1602
<59.3
59.25 - 59.35
max. 0.1602
Trip Voltages
Nominal
Voltage (V)
Trip Freq. (Hz)
Trip Limit
240
Line-to-Neutral (V)*
Trip Times(s)
50%
119 - 121
max. 0.1602
88%
210 - 212
max. 2.002
110%
261 - 263
max. 1.002
120%
287 - 289
max. 0.1602
NOTE: This unit or system is provided with fixed trip limits and shall not be
aggregated above 30 kW on a single Point of Common Connection.
9.3 Torque Values and Wire Sizes
Terminal
AC & DC Terminal Blocks (Phoenix)
Cover Machine Screws
Installation Guide
Install Torque
(Nm / ft-lbs)
-4 / 2.9
Wire Size
8AWG-12AWG
--
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Note
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