Renovo Digiwatts RN5000US User manual

PV Grid-Connected Inverter
Digiwatts RN5000US
Installation Guide

Installation Guide RN5000US Apr 13 2
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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 (Wuxi Lianyuan) Co., Ltd.
1608 Huishan Da Dao, Wuxi, Jiangsu,China
Tel: [phone] Fax: [phone]
http://www.renovo-power.com

Installation Guide RN5000US Apr 13 3
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions for Model RN5000US 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 RN5000US Apr 13 4
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 RN5000US Apr 13 5
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 RN5000US Apr 13 6
Table of Contents
1  Introduction ............................................................................................. 8
1.1Validity ....................................................................................... 8
1.2Target Group .............................................................................. 8
1.3Product Overview....................................................................... 9
1.4Feature Overview..................................................................... 13
1.5Safety....................................................................................... 13
1.5.1Protection and Criterion................................................ 13
1.5.2Safety Instructions........................................................ 16
1.5.3Symbols on the Type Label .......................................... 18
1.6Installation Overview ................................................................ 19
2  Unpacking and Inspection ...................................................................... 20
2.1Scope of Delivery..................................................................... 22
3AC Voltage Configuration ..................................................................... 23
3.1Opening the Digiwatts Unit....................................................... 23
3.2Locating Internal Components ................................................. 24
3.3Configuring the AC Voltage ...................................................... 25
4Mounting .............................................................................................. 26
4.1Choosing a Mounting Location................................................. 26
4.2Dimensions and Required Clearances ..................................... 28
4.3Mounting Procedure................................................................. 30
4.3.1Mounting the Wall-Mounting Screw .............................. 30
4.3.2Mounting the Digiwatts Unit to the Wall Bracket ........... 31
5Wiring the Digiwatts unit....................................................................... 33
5.1Sequence of Connecting.......................................................... 35
5.2Opening the Digiwatts .............................................................. 36
5.3Wiring the AC Output ............................................................... 38
5.3.1AC Connection Requirement........................................ 39
5.3.2Connecting the AC Wires ............................................. 40
5.4Wiring the DC input.................................................................. 41

Installation Guide RN5000US Apr 13 7
5.4.1DC Connection Requirements...................................... 42
5.4.2Connecting the DC Wires............................................. 45
5.5Communication Wiring............................................................. 46
5.5.1RS485 Communication ................................................ 47
5.6Closing the Digiwatts unit......................................................... 48
6Commissioning .................................................................................... 51
7Displays and Messages ....................................................................... 53
7.1LED Operation Indicators......................................................... 53
7.2Status Messages on the LCD Display ...................................... 54
7.3Fault Messages on the LCD Display ........................................ 56
7.4Operating Modes ..................................................................... 56
8Troubleshooting ................................................................................... 57
8.1General.................................................................................... 57
8.2Error Messages ....................................................................... 59
9Technical Specifications ....................................................................... 60
9.1Digiwatts Wiring Diagrams ....................................................... 60
9.2Specifications........................................................................... 61
9.3Trip Limits / Trip Times ............................................................. 62
9.4Torque Values and Wire Sizes ................................................. 62

Installation Guide RN5000US Apr 13 8
1 Introduction
1.1 Validity
This manual describes the assembly, installation, commissioning and
troubleshooting of the following Renovo inverter: Digiwatts RN5000US.
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 RN5000US Apr 13 9
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 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.

Installation Guide RN5000US Apr 13 10
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 RN5000US Apr 13 11
Terminals of the Digiwatts system
Figure 1-3 Product Description
Table 1-1 Terminals Description
Item Name Descri
p
tion
1 DC inputs Two pairs of DC strain reliefs are the input ports
2 LCD dis
p
la
y
Runnin
g
data is dis
p
la
y
ed on the LCD screen
3
A
C out
p
uts Out
p
ut
p
ort strain relief of the Di
g
iwatts unit
4 RS485 terminal Standard communication interface

Installation Guide RN5000US Apr 13 12
Dimensions and weight
Figure 1-4 Dimensions of the Digiwatts unit
Table 1-2 Dimensions Value
Type Depth
(mm/Inch)
Width
(mm/Inch)
Height
(mm/Inch)
Weight
(kg/lb.)
RN5000US 218 / 8.6 532 / 20.9 458 / 18 27 / 59

Installation Guide RN5000US Apr 13 13
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 45°C. The
Digiwatts system will continue to operate well beyond 45°C and de-rates as
needed to maintain a safe internal component temperature.
NOTICE!
Although the Digiwatts unit can be installed where temperatures
reach up to +45°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

Installation Guide RN5000US Apr 13 14
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 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 LDC user interface display.
This form of fault detection is much more sensitive and effective than
traditional GFI circuits, and has many years of successful use in Europe.
Inverters utilizing this form of Fault Detection are fully approved for use by
the latest electrical code.
AC Overcurrent Protection
The system will detect the AC current real time. Should the AC current
exceed 50 ampere, the Digiwatts system will shut down and display a fault
condition on the LCD user interface display.
Surge Protection
Over-voltage protection though the use of surge protection devices (SPDs)
or surge arresters should be provided when the PV power system is installed.
The Digiwatts unit is not equipped with SPDs on either the PV input side or
AC output side. Lightning can cause damage either from a direct strike or
from surges due to a nearby strike. Induced surges are the more likely cause
of lightning damage in the majority of installations, especially in rural areas
where electricity supplies are usually by long overhead lines. Surges may
be induced on both the PV array conductors and the AC cables leading to

Installation Guide RN5000US Apr 13 15
the building. The risk of a direct lightning strike into a building can be
mitigated by using appropriate external lightning protection configured to
discharge lightning current to ground. Specialists in lightning protection
should be consulted regarding the application.
To protect the DC system, surge suppression devices (SPD Type 2) should
be fitted at both the inverter end and array end of the DC cabling. If the
voltage protection level (VP) of the surge arresters is greater than 1100 V, an
additional SPD Type 3 is required for surge protection for electrical devices.
Figure 1-5 SPD Layout
To protect the AC system, surge suppression devices (SPD, type 2) should
be fitted at the main AC input point (at the consumer’s cutout), located
between the inverter and the meter/distribution system; SPD (test impulse
D1) for signal line according to EN 6164321. All DC cables should be
installed to provide runs as short as possible, and positive and negative

Installation Guide RN5000US Apr 13 16
cables of the same string or main DC supply should be bundled together,
avoiding the creation of loops in the system. This requirement for short runs
and bundling includes any associated earth/bonding conductors. Spark gap
devices are not suitable for use in DC circuits as once conducting, they
continue conducting until the voltage across their terminals is typically less
than 30 volts.
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.
1.5.2 Safety Instructions
DANGER: 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

Installation Guide RN5000US Apr 13 17
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.
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 RN5000US Apr 13 18
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.
Outdoor

Installation Guide RN5000US Apr 13 19
1.6 Installation Overview
This section provides an overview of the installation process.
Section 2: Unpacking and Inspection
Provides instructions for unpacking and inspecting the Digiwatts system for
shipping damage.
Section 3: 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 by following the written instructions.
Section 4: Mounting
Provides guidelines for the best mounting location and detailed mounting
instructions to ensure optimum performance,
Cautions and warnings to be followed to avoid injury and/or equipment
damage.
Section 5: 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 6: Commissioning
Commissioning involves applying DC input power to the Digiwatts unit and
resolving any problems that occur.
Section 7: Displays and Messages
Provides screen display information, meanings and how to determine faults.
Section 8: Troubleshooting
Provides troubleshooting tips and procedures for resolving problems that
may occur during installation and operation.

Installation Guide RN5000US Apr 13 20
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. Inspect packaging closely for
damage or compromised tape. Reinforce tape as necessary.