Renovo Digiwatts RN3000US User manual

PV Grid-connected Inverter
Digiwatts RN3000US
Installation Guide
Copyright © Renovo Power Systems. All rights reserved. (Rev 1.3)

Installation Guide RN3000US Apr 2013 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
416 W. Huron St., STE 20
Ann Arbor, MI 48103
Tel: 855-RENOVO1 (736-6861) Fax: [phone]
http://www.renovo-usa.com
Renovo Power Systems (Shanghai) Co., Ltd.
3rd floor , Haiye Building, No.518, Fengpu Av., Fengxian,
Shanghai,China
Tel: [phone]*002 Fax: [phone]
http://www.renovo-power.com

Installation Guide RN3000US Apr 2013 2
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.

Installation Guide RN3000US Apr 2013 3
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.

Installation Guide RN3000US Apr 2013 4
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.

Installation Guide RN3000US Apr 2013 5
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 .....................................................................................................23
4.1 Choosing a Mounting Location ................................................................23
4.2 Dimensions and Required Clearances .....................................................25
4.3 Mounting Procedure ..............................................................................26
4.3.1
Mounting onto the wall ................................................................26
4.3.2 Mounting the Digiwatts Unit to the Bracket ......................................28
5 Wiring the Digiwatts unit..............................................................................29
5.1 Sequence of Connecting ........................................................................31
5.2 Opening the Digiwatts ...........................................................................32
5.3 Wiring the AC Output ............................................................................33
5.3.1 AC Connection Requirement ........................................................33
5.3.2 Connecting the AC Wires .............................................................34
5.4 Wiring the DC input ...............................................................................35
5.4.1 DC Connection Requirements ......................................................35
5.4.2 Connecting the DC Wires .............................................................37
5.5 Communication Wiring ..........................................................................38
5.5.1 RS485 Communication ................................................................38

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5.5.2 Network communication..........................................................39
5.6 Closing the Digiwatts unit .......................................................................40
6 Commissioning ...........................................................................................41
7 Displays and Messages ..............................................................................43
7.1 LED Operation Indications .....................................................................43
7.2 Status Messages on the LCD Display ......................................................43
7.2.1 Activation of the LCD Backlight...............................................43
7.2.2 Switching interface..................................................................44
7.2.3 Operation interface .................................................................44
7.2.4 Time-power curve interface.....................................................45
7.2.5 Detail Information Interface.....................................................46
8 Troubleshooting ..........................................................................................47
8.1 General ...............................................................................................47
8.2 Error Messages ....................................................................................48
9 Technical Specifications ..............................................................................51
9.1 Specifications .......................................................................................51
9.2 Trip Limits / Trip Times ..........................................................................52
9.3 Torque Values and Wire Sizes ................................................................52

Installation Guide RN3000US Apr 2013 7
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.

Installation Guide RN3000US Apr 2013 8
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.
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.
PV Array Digiwatts
Meter
Utility Grid

Installation Guide RN3000US Apr 2013 9
 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.
Figure 1-2 Electrical Block Diagram
DSP1 DSP2
Boost Full bridge
DC+
DC-
L
N
Relay1 Relay2
LCD

Installation Guide RN3000US Apr 2013 10
 Terminals of the Digiwatts system
Figure 1-3 Terminals Description
Table 1-1 Terminals Descriptions
Item Name Descri
p
tion
1 RS485 terminal Standard communication interface
2 Network terminal Standard network interface
3 DC input Input port for 1/2 inch conduit
4 DC input Input port for 3/4 inch conduit
5 AC output Output port for 3/4 inch conduit
6 AC output Output port for 1/2 inch conduit
7 Switch Disconnect inverter from PV array and power grid
8 LCD screen Running data is displayed on the LCD screen
1
2
3
8
7
6
5
4

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 Dimensions and weight
Figure 1-4 Dimensions of the Digiwatts unit
Table 1-2 Dimensions and weight
Type Depth
(mm/Inch) Width (mm/Inch) Height (mm/Inch) Weight (kg/lb.)
RN3000US 174/ 6.8 469 / 18.5 488 / 19.2 23 / 50.7

Installation Guide RN3000US Apr 2013 12
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

Installation Guide RN3000US Apr 2013 13
is disconnected. The Digiwatts system periodically injects both leading and
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.

Installation Guide RN3000US Apr 2013 15
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.

Installation Guide RN3000US Apr 2013 16
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 toutch the inverter when it is operating.
The inverter need 15 minutes to discharge when stops
operating.
Outdoor

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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.

Installation Guide RN3000US Apr 2013 18
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. While
unpacking, be careful not to discard any equipment, parts or manuals. 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.

Installation Guide RN3000US Apr 2013 19
WARNING!
The Digiwatts unit weighs up to 23kg. 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
416 W. Huron St., STE 20
Ann Arbor, MI 48103
Tel: 855-RENOVO1 (736-6861) Fax: [phone]
http://www.renovo-usa.com
Asia: Renovo Power Systems (Shanghai) Co., Ltd.
3rd floor , Haiye Building, No.518, Fengpu Av., Fengxian
Shanghai, China
Tel: [phone]*002 Fax: [phone]
http://www.renovo-power.com