Renovo Digiwatts RN5000US User manual

Installation Guide RN5000US
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PV grid-connected inverter
Digiwatts RN5000US
Installation Guide

Installation Guide RN5000US
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Copyright © Renovo Power Systems. All rights reserved.
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 Street
Suite 100
Ann Arbor, MI 48105
Tel: (855) RENOVO1 (736-6861)
Fax: [phone]
http://www.renovo-usa.com

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IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manualcontainsimportant instructions forModelRN5000USSOLAR
INVERTERS. It must be accurately understood and followed during installationand
maintenance oftheinverter. TheDigiwattssystemis designedaccordingto
international safetystandards, however withall electricalandelectronic equipment,
installation and operation must follow some preventive measures. To reducethe risk
of electrical shock hazards and to ensure that equipment installation and
commissioning is conducted safely; all instructions, cautions and warnings in this
InstallationGuide must becloselyread and followed.
Warnings
AWarning describesahazardtoequipment or personnel. Itcalls attention to a
procedureor practice, which, if not correctly performed or adhered to,could result in
damage to or destruction ofpartor all of the RenovoPower equipmentand/or other
equipmentconnected to the RenovoPower equipmentor personalinjury.
WARNING!
WARNING indicates a hazardous situation which,if not avoided, could
resultindeathorseriousinjury.
CAUTION!
CAUTION indicates a hazardous situation which, if not avoided, could result
in minorormoderateinjury.
NOTICE!
Theparagraphs highlightedby this symbol contain processesand
instructions that must be rigorouslyunderstood and followed to avoid
potential damageto theequipment, negative results and to ensure the unit
achieves optimalperformance.

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In additionto thesafety and hazardsymbols describedon thepreviouspages, the
following symbols are also usedin this Installation Guide. Makesuretoreadthe
labels and fullyunderstand them before installing the equipment.
INFORMATION
This symbol callsattention to supplementary informationthat you should
know and to ensureoptimaloperation oftheunit.
Markings on this product
The following symbols are used as markings on this product with the following
meanings.
Warning regarding dangerous voltage
Theproductworkswithhigh voltages. All work on the product mayonly
be doneas described inthe documentation.
Beware of hot surface
The product can generateheatduringoperation. Avoidcoming into
contact with the productduring operation.
Observe the operating instructions
Read the product’s documentation before working on it. Follow all safety
precautionsand instructionsas described in thedocumentation.
Safety criterion
ETL is the standard appliedby ElectricalTesting Laboratoriesto the
Digiwatts system to certify that it meets the requirements of the highest
safety criterion of theUSA andCanada.

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General Warnings
Allelectrical installations must be done in accordance with the local andNational
Electrical CodeANSI/NFPA70. Forinstallationin Canada theinstallationsmust be done
in accordancewith applicableCanadianstandards.
The Digiwatts unit contains no user-serviceable parts. For all repair andmaintenance
always return the unit to an authorized Renovo Power Service Center.
Before installing orusing the Digiwatts unit, read allof the instructions,cautions, and
warnings on the Digiwatts unit, the PV array and in this Installation Guide.
PV arrays produce electricalenergy when exposedto lightandthuscan create an
electricalshock hazard. Wiring of the PV-arrays should only be performed by
qualifiedpersonnel. According to these basic safety rules, qualified and trained
people have skills for the assembling, start-up and operation of theproduct, as well
as thenecessaryrequirementsand qualificationsto perform such operations.

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Table of Contents
1 Introduction.....................................................................................................8
1.1Validity ....................................................................................................8
1.2Target group ............................................................................................8
1.3Product overview .....................................................................................9
1.4Feature Overview ..................................................................................13
1.5Safety ...................................................................................................13
1.5.1Protection and criterion .................................................................13
1.5.2 Safety instructions ........................................................................16
1.5.3SymbolsontheTypeLabel ...........................................................18
1.6Installation Overview ..............................................................................19
2 Unpacking and Inspection............................................................................20
2.1Scope ofDelivery ...................................................................................22
3 AC Voltage Configuration.............................................................................23
3.1OpeningtheDigiwattsUnit ......................................................................23
3.2Locating Internal Components .................................................................24
3.3 Configuring theAC Voltage .....................................................................25
4 Mounting.......................................................................................................26
4.1Choosing aMounting Location ................................................................26
4.2 Dimensionsand Required Clearances .....................................................28
4.3Mounting Procedure .......................................................................30
4.3.1Mounting theWall-Mounting Screw .........................................30
4.3.2 Mounting the Digiwatts Unitto theWall Bracket ........................31
5 Wiring the Digiwatts unit...............................................................................32
5.1SequenceofConnecting ........................................................................35
5.2OpeningtheDigiwatts ............................................................................36
5.3 Wiring theAC Output ..............................................................................37
5.3.1AC ConnectionRequirement .........................................................37
5.3.2 ConnectingtheAC Wires ..............................................................38
5.4 Wiring the DC input ................................................................................39

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5.4.1 DC ConnectionRequirements .......................................................39
5.4.2 Connectingthe DC Wires .............................................................43
5.5CommunicationWiring ...........................................................................43
5.6 Closing theDigiwatts unit ........................................................................45
6 Commissioning.............................................................................................47
7 Displays and Messages...............................................................................49
7.1 LED Operation Indicators ........................................................................49
7.2 Status Messages on the LCD Display ......................................................50
7.3 FaultMessages on the LCD Display ........................................................52
7.4Operating Modes ...................................................................................52
8 Troubleshooting............................................................................................53
8.1General ................................................................................................ 53
8.2Error Messages .....................................................................................55
9 Technical Specifications...............................................................................56
9.1Digiwatts Wiring Diagrams ......................................................................56
9.2 Specifications ........................................................................................56
9.3Trip Limits /Trip Times ............................................................................58
9.4Torque Valuesand Wire Sizes .................................................................58

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1 Introduction
1.1 Validity
This manualdescribestheassembly, installation, commissioning and troubleshooting
of the following Renovo inverter: Digiwatts RN5000US.
Information
To helpavoid problems during the installation, familiarize yourselfwith the
installation process by reading the entire Installation Guidebefore starting the
installation.
WARNING!
Lethal voltagesarepresentatvarious points in a PVsystem. Forsafety
reasons, it is recommended that only qualifiedpersonnel can install and
operate this equipment.
Read and understand all theinstructionscontainedin this manual and become familiar
with the safety symbols in the relevant paragraphs before you install and commission
theequipment.
1.2 Target group
This manual is forqualified electricians. The tasks describedin this manual maybe
performedby electricallyqualified personsonly.

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1.3 Product overview
 Basic information
The Digiwatts inverter isused to convert DC power generated bythe PV arrays into
stable AC power foroutput to the utility grid. The Digiwatts system is a
transformerless inverter and performs this conversion ina very efficient way, without
moving components, using only solid state power electronic devices. Itis a crucial
unitinthesmall-scale PV powersystem.
An exampleofbasic PV power system components is shown in the Figure1-1.
PV Ar r ay Di gi wat t s
Met er
Ut i l i t y Gr i d
Figure 1-1: Digiwattssystemisinstalledin aUtility Interactive PV System
Information
Policies varyfrom one utility companyto another. Consult with a
representativeofthe local utility companybefore designing and installing a PV
system.
NOTICE!
Anyother or additional use is not permitted except the intended use.
Theinverter must only be connectedto public utilitygrid. If output of inverter is
connected to local loads (household appliance, lights, motor loads, etc.) the
inverter willnot 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 raisesinputDC voltage within the inverter. Then a Maximum
Power PointTracker (MPPT) ensures that maximumpower 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 ElectricalBlock Diagram
DSP1 DSP2
Boost Full bridge
DC+
DC-
L
N
Relay1 Relay2
LCD

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Terminals of the Digiwatts system
1
2
3
4
Figure 1-3 ProductDescription
Table 1-1 Terminals Description
Item Name Description
1 DC inputs Two pairs of DC strain reliefs are the input ports
2 LCD display Running data is displayed on the LCD screen
3 AC outputs Output port strain relief of the Digiwatts unit
4 RS485 terminal Standard communication interface

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 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

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1.4 Feature Overview
TheDigiwatts systemrepresents state-of-the-art technology. Several keyfeatures:
High reliabilityand safety
High efficiency
Simple installation
Quietoperation
LCD Display
Powdercoated die-cast enclosure
Operating Temperature
The Digiwatts system has been equipped with a passive radiatorused to maintain full
poweroutputatambienttemperaturesas high as45°C. The Digiwattssystemwill
continue to operate well beyond 45°C and de-ratesas needed to maintain a safe
internalcomponenttemperature.
NOTICE!
Although theDigiwattsunitcan be installedwheretemperaturesreachupto
+45°C,itisstrongly recommendthatitbe installedwhere ambienttemperature
in therange of0~+40°C.
1.5 Safety
1.5.1 Protection and criterion
Anti-Islanding Protection
Islanding is acondition that can occur if the utility grid is disconnected while the
Digiwattssystemis operating andthe remainingloadisresonantat 60Hzandmatches

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the output of the Digiwatts perfectly. The Digiwatts system incorporates an advanced
active islanding protection algorithm to ensure that the system will notexport power into
a balanced 60 Hz resonant load while the utility is disconnected. The Digiwatts system
periodically injects both leading and lagging reactive currentinto the utility grid. This
method has been proven byindependent 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 systemwill detect the isolationof
PV+ and PV-to the ground. When theinsulate impedance is less than1MΩ,the
inverter will not function. After the inverter is connected to thegrid,thesystem will
detect the residualcurrent. If a residual current greater than 30mA is detected, the
Digiwatts system will shutdown and display a fault condition on the LDC userinterface
display.
AC Overcurrent Protection
The systemwill detect the AC current real time. Should the AC currentexceed 50
ampere, the Digiwatts system will shut down and displaya fault condition on the LCD
user interfacedisplay.
Surge Protection
Over-voltage protectionthough the use ofsurge protection devices(SPDs) or surge
arrestersshouldbeprovidedwhenthePVpowersystemisinstalled. TheDigiwattsunit
is notequippedwith SPDs on eitherthePV input side or AC output side.Lightningcan
causedamage eitherfrom a direct strike or from surges due to a nearby strike.Induced
surges arethemore likely causeof lightningdamage in the majority ofinstallations,
especiallyin rural areas where electricity suppliesare usually by long overhead lines.
Surges maybe inducedon both thePV array conductors and the AC cables leadingto
thebuilding.The risk of a direct lightning strike into a building can bemitigated by using
appropriate external lightning protection configured to discharge lightning currentto
ground. Specialists in lightningprotection should be consultedregardingthe

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application.
To protect the DC system, surge suppression devices(SPD Type 2)should be fitted at
both the inverterend andarray end of the DC cabling. If thevoltageprotection level
(VP) of thesurge arresters is greaterthan 1100V, 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 fittedat
themain AC input point (at the consumer’s cutout), locatedbetween the inverterand

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the meter/distribution system; SPD (test impulse D1) forsignal line according to EN
6164321. AllDC cables should be installed to provide runs as short as possible,and
positive and negative cables ofthe same string or main DC supplyshould bebundled
together,avoiding thecreation ofloops in the system. This requirement for short runs
and bundling includesany associated earth/bonding conductors. Sparkgapdevices
are notsuitable forusein DC circuits as once conducting, they continue conducting
until the voltage across theirterminals is typicallyless than 30volts.
Safety criterion
ETL is the standard appliedby ElectricalTesting Laboratoriesto the
Digiwatts system to certify that it meets the requirements of the highest
safety criterion of theUSA andCanada.
The Digiwatts system has been tested and listed by ETL to meet the
requirements ofUL1741 Static Inverters and IEEE 1547 Standard for
Interconnecting Distributed Resources with ElectricPowerSystems. The
Digiwatts system is also listed under CSA Std C22.2 No.107.1-01.
1.5.2 Safety instructions
DANGER
Danger to life due to high voltages in the inverter!
Allwork on the inverter mayonlybecarried outby qualified personnel.
The appliance is notto be usedby childrenor personswith reduced
physical,sensory or mental capabilities, or lack of experience and
knowledge,unless theyhave been given supervision or instruction.
Children should be supervised to ensure that they do not play with the
appliance.
CAUTION
Risk of Burn Injuries!
Partsoftheenclosurecanbecome hot. Theproductcangenerateheatduring
operation. Avoidcoming into contactwith theproductduringoperation.

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CAUTION
Possible damage to health as a resultof the effects ofelectro-magnetic
radiation! Do notstay closer than 20 cm to theinverter for an extendedof 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 voltagesourcesare terminated insidethis equipment.
Each circuitmust be individuallydisconnected before servicing.
When the photovoltaic array is exposedto light, it supplies a DC voltage
to this equipment.
WARNING
For continued protection against fire, replacefuses only with units of same
typeand ratings.
CAUTION
Risk ofelectric shock form energy storedin capacitor!
Do notremovecover until15 minutes afterdisconnectingall sources of
supply.
CAUTION
The Digiwatts system shall notbe connected to a battery due to lack of over-
currentprotection providedinthe 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.
Outdoor

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1.6 Installation Overview
This section providesan overview of the installation process and UserManual
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 carefullybefore using thisproduct. Ifyou encounterany problem
during installing or running this unit, pleasecheckthis manual first before contacting
your localdealeror representative. Manyproblems encountered can besolved
accordingto theinstructionsinside.
Section 3: Mounting
Provides guidelines forthe best mounting location and detailed mounting instructions
to insure optimum performance,
Cautionsand warnings to be followed to avoidinjuryand/orequipmentdamage.
Section 4: Wiring
Guidelinesforselectingthecorrectwire sizes
Cautionsand warnings that should be followed to avoidinjury and/orequipment
damage
Step-by-step instructions for wiringthe Digiwatts systemto a PV arrayand the utility
grid
Proceduresforconnecting optional data-communication cables
Section 5: Commissioning
Commissioning involves applying DC input power to the Digiwatts unitand resolving
anyproblemsthat occur.
Section 6: Displays and Messages
Provides screen displayinformation,meanings and how to determine faults.
Section 7: Troubleshooting
Provides troubleshooting tips andprocedures for resolving problems that mayoccur
during installationand 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 fastenersof the Digiwatts unit.
2 Unpacking and Inspection
NOTICE!
The distributor deliveredyour Digiwatts unit to the carrier fully functional and
securely packaged. Upon acceptance of the package,the carrierassumes
responsibility for its safe delivery. In spite ofcarefulhandling,transportdamage to
packageor its contents is always a possibility.
Inspectthe shipping box for apparent damage, such as holes,tears orany other
sign of possibledamage to its contents.
Describeanydamageorshortageon thereceiving documents, making sure to
obtain the carrier acknowledgment with his/herfull signature.
Open theshippingboxand inspect the contents for internal damage. While
unpacking, be carefulnot to discardany equipment, parts or manuals. If any
damage is detected, call the delivering carrierto determine theappropriate action.
Save all shippingmaterialin the eventthecarriersendsan inspector toverify
damage!
If theinspection reveals damage to the inverter call your supplier,orauthorized
distributor. They will determine if the equipment should be returnedfor repair and
provide instructionsto 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 servicerights for any damage.
If it becomes necessary to return the Digiwatts unit, use the original packaging in
which it wasdelivered.