Generac Power Systems PV Link User manual

Installation Manual
Generac PV Link™ and SnapRS™
SAVE THIS MANUAL FOR FUTURE REFERENCE
006087
010023
(000209b)
WARNING
Loss of life. This product is not intended to
be used in a critical life support application.
Failure to adhere to this warning could result
in death or serious injury.
Register your Generac product at:
https://pwrfleet.generac.com
1-888-GENERAC
(888-436-3722)
Para español, visita: http://www.generac.com/service-support/product-support-lookup
Pour le français, visiter: http://www.generac.com/service-support/product-support-lookup

Use this page to record important information about your Generac Product
Record PV Link™ and SnapRS™ information
for your PWRcell system on this page.
When contacting a Generac Products
Authorized Service Dealer (ASD) about parts
and service, always supply complete model
number and serial number information.
Operation and Maintenance: Proper
maintenance and care of the energy storage
system ensures a minimum number of
problems and keeps operating expenses at a
minimum. It is the operator’s responsibility to
perform all safety checks, to verify that all
maintenance for safe operation is performed
promptly, and to have the equipment checked
periodically by an ASD. Normal maintenance,
service and replacement of parts are the
responsibility of the owner/operator and, as
such, are not considered defects in materials
or workmanship within the terms of the
warranty. Individual operating habits and
usage may contribute to the need for
additional maintenance or service.
Table 1 - PV Link and SnapRS Important Information
PV Link
Number Location Serial Number RCP Number Parallel Input?
Number of
SnapRS
SnapRS Date of
Manufacture
1
2
3
4
5
6
(000393a)
WARNING
CANCER AND REPRODUCTIVE HARM
www.P65Warnings.ca.gov.

Table of Contents
Section 1 Introduction and Safety 1
Introduction ..................................... 1
Safety Rules .................................... 1
General Hazards ............................. 2
PVRSE Warning .............................. 2
Electrical Hazards ........................... 3
Section 2 General Information ..... 5
PV Link Specifications ..................... 5
SnapRS Specifications .................... 5
Unit Dimensions .............................. 6
About PV Link ................................. 7
About Generac SnapRS .................. 7
GFCI Information ............................. 7
AFCI Information ............................. 7
PVRSS Information ......................... 7
Component Locations ..................... 7
Section 3 Installation Design ....... 9
Installation Design Worksheet ......... 9
Section 4 PVRSS Compliance
Guidelines .................................... 11
Section 5 Mounting and
Connecting .................................. 13
Installation Guidelines ................... 13
Attachment and Grounding ........... 13
Connecting to Inverter ................... 14
Connecting PV Modules ................ 14
Section 6 Operating
Instructions .................................. 17
User Interface via Inverter ............. 17
Commissioning the Rebus
System .......................................... 17
PVRSS Commissioning with
SnapRS Devices ........................... 17
Disabling PV Link .......................... 19
AFD Self-Test ................................19
PVRSS Self-Test ...........................19
Section 7 Maintenance ................21
Maintenance ..................................21
Service ...........................................21
Section 8 Troubleshooting .........23

Installation Manual for PV Link and SnapRS 1
Section 1 Introduction and Safety
Introduction
Thank you for purchasing a Generac PWRcell
product.
This manual provides instructions for installing
PV Link and SnapsRS devices. Consult the
installation and operation manuals for other
Generac PWRcell system components, as
applicable.
The information in this manual is accurate
based on products produced at the time of
publication. The manufacturer reserves the
right to make technical updates, corrections,
and product revisions at any time without
notice.
If any section of this manual is not understood,
contact the nearest Independent Authorized
Service Dealer (IASD) or Generac Customer
Service at 1-888-436-3722 (1-888-GEN-
ERAC), or visit www.generac.com for assis-
tance. The owner is responsible for correct
maintenance and safe use of the unit.
This manual must be used in conjunction with
all other supporting product documentation
supplied with the product.
SAVE THESE INSTRUCTIONS for future ref-
erence. This manual contains important
instructions that must be followed during
placement, operation, and maintenance of the
unit and its components. Always supply this
manual to any individual that will use this unit,
and instruct them on how to correctly start,
operate, and stop the unit in case of emer-
gency.
Safety Rules
The manufacturer cannot anticipate every
possible circumstance that might involve a
hazard. The alerts in this manual, and on tags
and decals affixed to the unit, are not all inclu-
sive. If using a procedure, work method, or
operating technique that the manufacturer
does not specifically recommend, verify that it
is safe for others and does not render the
equipment unsafe.
Throughout this publication, and on tags and
decals affixed to the unit, DANGER, WARN-
ING, CAUTION, and NOTE blocks are used to
alert personnel to special instructions about a
particular operation that may be hazardous if
performed incorrectly or carelessly. Observe
them carefully. Alert definitions are as follows:
NOTE: Notes contain additional information
important to a procedure and will be found
within the regular text of this manual.
These safety alerts cannot eliminate the haz-
ards that they indicate. Common sense and
strict compliance with the special instructions
while performing the action or service are
essential to preventing accidents.
How to Obtain Service
For assistance, contact the nearest Indepen-
dent Authorized Service Dealer (IASD) or
Generac Customer Service at 1-888-GEN-
ERAC (1-888-436-3722), or visit
www.generac.com.
When contacting Generac Customer Service,
always supply the complete model and serial
number of the unit as given on its data decal
located on the unit. Record the model and
serial numbers in the spaces provided on the
front cover of this manual.
(000100a)
Consult Manual. Read and understand manual
completely before using product. Failure to
completely understand manual and product
could result in death or serious injury.
WARNING
(000001)
DANGER
Indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
(000002)
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
(000003)
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.

2 Installation Manual for PV Link and SnapRS
General Hazards
• Connecting Generac PWRcell to the elec-
tric utility grid must only be done after
receiving prior approval from the utility
company.
• Only competent, qualified personnel should
install, operate, and service this equipment.
Strictly comply to local, state, and national
electrical and building codes. When using
this equipment, comply with regulations
established by the National Electrical Code
(NEC), CSA Standard; the Occupational
Safety and Health Administration (OSHA),
or the local agency for workplace health
and safety.
• Protection against lightning surges in
accordance with local electric codes is the
responsibility of the installer.
NOTE: Lightning damage is not covered by
warranty.
• If working on this equipment while standing
on metal or concrete, place insulative mats
over a dry wood platform. Work on this
equipment only while standing on such
insulative mats.
• Never work on this equipment while physi-
cally or mentally fatigued.
• Any voltage measurements should be per-
formed with a meter that meets UL3111
safety standards, and meets or exceeds
overvoltage class CAT III.
PVRSE Warning
NOTE: SnapRS devices must be used in con-
junction with Generac S2502 PV link to form a
complete PVRSS per NEC 690.12
This Photovoltaic Rapid Shutdown Equipment
(PVRSE) does not perform all of the functions
of a complete Photovoltaic Rapid Shutdown
System (PVRSS). This PVRSE must be
installed with other equipment to form a com-
plete PVRSS that meets the requirements of
NEC (NFPA 70) section 690.12 for controlled
conductors outside the array. Other equipment
installed in or on this PV system may
adversely affect the operation of the PVRSS.
It is the responsibility of the installer to ensure
the completed PV system meets the rapid
shutdown functional requirements. This equip-
ment must be installed according to the manu-
facturer’s installation instructions.
(000191)
DANGER
Automatic start-up. Disconnect utility power and
render unit inoperable before working on unit.
Failure to do so will result in death or serious injury.
WARNING
Risk of injury. Do not operate or service this machine
if not fully alert. Fatigue can impair the ability to
service this equipment and could result in death or
serious injury. (000215)
(000209b)
WARNING
Loss of life. This product is not intended to
be used in a critical life support application.
Failure to adhere to this warning could result
in death or serious injury.
(000670)
WARNING
Hot Surfaces. Locate and install the PV Link so as to avoid
inadvertant contact. When operating in hot weather the
optimizer will become hot and could result in personal
injury.
(000155a)
WARNING
Electric shock. Only a trained and licensed electrician
should perform wiring and connections to unit. Failure to
follow proper installation requirements could result in death,
serious injury, and equipment or property damage.
(000182a)
WARNING
Equipment damage. Only qualified service personnel may
install, operate, and maintain this equipment. Failure to
follow proper installation requirements could result in death,
serious injury, and equipment or property damage.
(000655)
WARNING
Equipment damage. Never open the PV Link. The
optimizer is factory-sealed and contains no field-
serviceable parts. Opening the optimizer could result in
equipment damage.
(000669)
WARNING
Equipment damage. Never operate PV Link in ambient
temperatures greater than 158° F (70° C). Operating
PV Link in high temperature conditions will result in
equipment damage.
Equipment damage. Connect only to REbus-compatible
devices to the DC bus. Never connect to any other DC
power source. Connecting to other DC power sources
could result in equipment damage. (000598a)
CAUTION

Installation Manual for PV Link and SnapRS 3
Electrical Hazards
(000104)
DANGER
Electrocution. Water contact with a power
source, if not avoided, will result in death
or serious injury.
(000145)
DANGER
Electrocution. In the event of electrical accident,
immediately shut power OFF. Use non-conductive
implements to free victim from live conductor. Apply
first aid and get medical help. Failure to do so will
result in death or serious injury.
(000599)
Electrocution. Turn battery disconnect OFF and
de-energize REbus before touching terminals.
Failure to do so will result in death, serious injury,
equipment and property damage.
DANGER
(000152)
DANGER
Electrocution. Verify electrical system is
properly grounded before applying power.
Failure to do so will result in death or serious
injury.
(000188)
DANGER
Electrocution. Do not wear jewelry while
working on this equipment. Doing so will
result in death or serious injury.
(000666)
WARNING
Electric Shock. Avoid contact with DC conductors. DC
conductors of this photovoltaic system are ungrounded and
may be energized regardless of sun exposure. Contact with
conductors could result in death or serious injury.
(000187)
WARNING
Electrocution. Potentially lethal voltages are generated
by this equipment. Render the equipment safe before
attempting repairs or maintenance. Failure to do so
could result in death or serious injury.

4 Installation Manual for PV Link and SnapRS
This page is intentionally left blank

Installation Manual for PV Link and SnapRS 5
Section 2 General Information
PV Link Specifications
Specifications are subject to change without notice. Refer to the product specification sheet for complete list.
SnapRS Specifications
* 1 SnapRS per PV module.
** Used with a 50 V PV Panel.
Specifications are subject to change without notice. Refer to the product specification sheet for complete list.
Description Units S2502
Rated power W 2500 (continuous)
Peak efficiency % 99
MPPT input voltage VDC 60–360
Rated power input voltage VDC 200–360
Maximum input voltage VDC 420 (absolute maximum)
Maximum input current (operating) A
ºF (ºC)
13 @ 122 (50)
Maximum input current (short circuit) A 18
Maximum output current (fault) A 10
Maximum output voltage VDC 420 (open circuit)
Nominal output - REbus DC nanogrid (380 VDC + data)
Maximum output current (continuous) A 8
Standby power W <1
Topology - Boost converter
Protections - Ground-fault protection, arc-fault protection
(type 1), PVRSE
Operating temperature range ºF (ºC) -40 (-40) to 158 (70)
Enclosure - NEMA Type 3R
Weight lb (kg) 7.3 (3.3)
Certifications - UL 1741
Description Units RS801
PV module maximum VOC V 75
Maximum number of PV modules per
string
- 9*
Efficiency % 99.8**
Maximum input current A 13
Shutdown time Sec < 10
Enclosure rating - NEMA Type 6P
Operating temperature range ºF (ºC) -40 (-40) to 158 (70)
Certifications - UL 1741
Weight oz (g) 3.5 (100)

6 Installation Manual for PV Link and SnapRS
Important Product Information
PV Link Serial Number Location
See Figure 2-1. Serial number tag (A) includes a
removable layer that can be peeled off leaving the
underlying label in place. Adhere the removable
layer to the inside cover of this manual and record
the information from this tag in Table 1: PV Link
and SnapRS Important Information.
Figure 2-1. Serial Number Location
SnapRS Date of Manufacture
Refer to Figure 2-2 to locate the unit date of
manufacture. Record this information in
Table 1: PV Link and SnapRS Important Infor-
mation on the inside front cover of this man-
ual.
Figure 2-2. Date of Manufacture
Unit Dimensions
PV Link Dimensions
Figure 2-3. Unit Dimensions
*18-1/8 in (460 mm) with PV wire bend
radius
SnapRS Dimensions
Figure 2-4. Unit Dimensions
A
010021
A
A9-9/16 in (243 mm)
B* 15-1/2 in (390 mm)
C2-1/16 in (53 mm)
A7/8 in (22 mm)
B7 in (152 mm)
C1 in (25 mm)
r
CB
A
010024
A
C
B

Installation Manual for PV Link and SnapRS 7
About PV Link
The PV Link is a nonisolated, interleaved DC-
DC converter that boosts PV input to a higher
voltage and outputs it to Rebus™, Generac’s
regulated 380 VDC bus. The PV Link provides
droop-mode power management, enabling
multiple optimizers to connect in parallel on a
common bus, and its DC output carries a bidi-
rectional power line communication (PLC)
protocol for communicating with inverters and
other devices on REbus.
The PV Link is sealed in a type 3R enclosure
at the factory and is designed for attachment
to standard PV racking. Safety features
include ground fault detection, arc fault detec-
tion, and rapid shutdown capability.
About Generac SnapRS
SnapRS is an inline PV rapid-shut down
device that satisfies 2017 and 2020 NEC
690.12 PV rapid shutdown system (PVRSS)
requirements. When used with PV Link,
SnapRS devices limit all controlled conductors
within an array’s 1 ft (305 mm) boundary to 80
VDC or less within 30 seconds of rapid shut-
down initiation.
GFCI Information
The PV Link’s internal ground-fault circuit
interrupter (GFCI) is designed to trip at 240
mA (± 40 mA) of PV DC voltage ground cur-
rent. Ground faults are displayed on the PWR-
cell inverter control panel. The PV Link meets
the ground-fault protection requirements in
NEC Article 690.41(B).
AFCI Information
The PV Link is a Photovoltaic DC Arc-Fault
Circuit Protection Type 1 device that incorpo-
rates an internal arc fault circuit interrupter
(AFCI) and meets the Arc-Fault circuit protec-
tion requirement in NEC Article 690.11.
PVRSS Information
PV rapid shutdown system (PVRSS) require-
ments have evolved over time and are defined
by the National Electrical Code (NEC) in con-
junction with UL 1741. Determine what level of
rapid PV shutdown is required for your juris-
diction.
• The 2011 NEC and older editions do not
require PVRSS capability.
• The 2014 NEC requires rapid shutdown
only on the conductors leaving the PV
array.
• The 2017 and 2020 NEC require rapid
shutdown at the PV module level and on
the conductors leaving array.
PV Link is a PV rapid shutdown system equip-
ment (PVRSE) component within a PVRSS. It
only provides rapid shutdown for the conduc-
tors leaving the array. SnapRS devices are
required for PV module level rapid shutdown.
See PVRSS Compliance Guidelines for more
information.
Component Locations
PV Link Component Locations
Figure 2-5. Component Locations
AAttachment Flange Slots
BGrounding Terminals (sized for 1/4 in hard-
ware)
CREBus DC Nanogrid Output Negative (-)
Lead
DREBus DC Nanogrid Output Positive (+)
Lead
EPV Substring Input Negative (-) Lead
FPV Substring Input Positive (+) Lead
GMC4 Connectors
E
C
F
D
A
B
G
010023

8 Installation Manual for PV Link and SnapRS
SnapRS Component Locations
Figure 2-6. Component Locations
APositive PV Connector
BNegative PV Connector
A
B
010050

Installation Manual for PV Link and SnapRS 9
Section 3 Installation Design
Installation Design Worksheet
Use this worksheet to determine the maximum
number of PV modules of a given type that
can be connected to a PV Link.
NOTE: Fewer PV modules can be used as
long as the minimum MPPT input voltage is
met.
1. Calculate an adjusted open circuit voltage
(VOC) for the module being installed using
the applicable NEC cold factor from
Table 1: NEC Cold Factor.
NOTE: The temperature correction factor
listed on the module nameplate can be used if
available.
2. Divide the PV Link Max VOC by the
Adjusted VOC from step 1 and round
down to determine the number of panels
that can be connected in series to the PV
Link without exceeding the open-circuit
voltage limit.
3. Divide the PV Link VMP (Voltage at Maxi-
mum Power) by the panel VMP and round
down to determine the number of panels
that can be connected in series to the PV
Link without exceeding maximum power
voltage.
4. Compare the results from step 2 and step
3 and choose the smaller number. Round
down to the nearest integer and record it
below. This is the maximum number of
modules of this type that can be con-
nected to the PV Link given the specified
NEC cold factor.
Panel
VOC X
NEC Cold
Factor =
Adjusted
VOC
PV Link
Max VOC ÷
Adjusted
VOC =
VOC Limit
Result
420 V
PV Link
Max VMP ÷
Panel
VMP =
VMP
Limit
360 V
Maximum Panels per Substring
Table 1 - NEC Cold Factor
Minimum Temperature (°F) NEC Cold
Factor
Minimum Temperature (°C)
49 to 41 1.08 9 to 5
40 to 32 1.10 4 to 0
31 to 23 1.12 -1 to -5
22 to 14 1.14 -6 to -10
13 to 5 1.16 -11 to -15
4 to -4 1.18 -16 to -20
-5 to -13 1.20 -21 to -25
-14 to -22 1.21 -26 to -30
-23 to -31 1.23 -31 to -35
-32 and below 1.25 -36 and below

10 Installation Manual for PV Link and SnapRS
This page is intentionally left blank

Installation Manual for PV Link and SnapRS 11
Section 4 PVRSS Compliance Guidelines
2011 NEC and Older Editions
2011 NEC and older editions do not require
PVRSS compliance.
NOTE: The PV Link will still provide 2014
NEC compliant PV Rapid Shutdown.
2014 NEC
The 2014 NEC 690.12 introduced a new
requirement for PV systems that is commonly
referred to as PV rapid shutdown.
To meet 2014 NEC compliance:
1. Install the PWRcell inverter as specified in
the Generac PWRcell Inverter Installation
Manual.
2. Install the PV Link as specified in this man-
ual.
3. The DC disconnect under the PWRcell
inverter cover labeled PV by the installer
can be used as the PVRSS initiation
device. See Shutdown in the Generac
PWRcell Inverter Installation Manual for
more information.
Rapid shutdown response time is less than 30
seconds.
2017 and 2020 NEC
The 2017 and 2020 NEC have PVRSS
requirements mandating the need to reduce
voltages of controlled conductors to less than
80 VDC within the array, as well as some
specification for the location of the PVRSS ini-
tiator and its labeling.
To meet 2017 and 2020 compliance:
1. The 2017 and 2020 NEC requires the
PVRSS initiator be located at a readily
accessible location outside the building.
– The DC disconnect under the PWRcell
inverter cover labeled PV by the
installer can be used as the PVRSS ini-
tiation device.
NOTE: Provide signage indicating the PVRSS
initiation device is the REbus PV DC discon-
nect located under the front cover of the
inverter.
– An externally mounted PVRSS initia-
tion device is required to be installed at
a readily accessible location when the
PWRcell inverter is installed within a
one- or two-family dwelling unit.
NOTE: Provide signage indicating where
PVRSS initiation devices are located. Note
that if the inverter is installed in the appropri-
ate outdoor location it may satisfy this require-
ment.
2. Provide signage complying with section
690.56(C) of the NEC (NFPA 70), stating
all conductors are controlled.
NOTE: Install one SnapRS to the negative
whip (-) of each PV module connected to the
PV Link.
3. Install the PV Link. See Installation Guide-
lines for more information.
Upon initiation of rapid shutdown, both inputs
and outputs of the PV Link are controlled to be
less than 80 VDC. Rapid shutdown response
time is less than 30 seconds, in accordance
with section 690.12 of the NEC (NFPA 70).

12 Installation Manual for PV Link and SnapRS
This page is intentionally left blank

Installation Manual for PV Link and SnapRS 13
Section 5 Mounting and Connecting
Installation Guidelines
• Install PV Links close to the edge of the
array for best cooling and easier service
access.
• Calculate maximum substring length using
the Installation Design Worksheet work-
sheet in Section 3 of this manual.
• The modules within each substring must be
the same type, and all should be mounted
at the same pitch and orientation.
• When installing a system with multiple PV
Links, it is not necessary to match the num-
ber of modules, roof pitch, or orientation
across all substrings in an array.
• Ensure at least a 1 in (25.4 mm) clearance
between the heatsink fins and adjacent sur-
faces to allow sufficient air flow for cooling.
• The PV Link can be installed in any orienta-
tion. Cooling is most effective if fins are ori-
ented vertically and facing away from the
PV panel.
• Mount the optimizer at least 3 ft (0.9 m)
from the ground.
• Review the PV module instructions to
determine if any restrictions for mounting
devices under the module exist as part of
the PV module listing.
Attachment and Grounding
NOTE: Proper grounding is necessary for
REbus communication.
Installing to Metallic or Grounded
Structures
See Figure 5-1. If mounting PV Link under-
neath an array to metallic PV racking, install
the PV Link with label (A) facing up. Attach-
ment flange slots (B) accept fasteners up to
M8 or 5/16” in diameter.
Installing to Nonmetallic or
Ungrounded Structures
• Use two fasteners appropriate for the struc-
ture.
• See Figure 5-1. Fasten to grounding termi-
nal (C) the equipment grounding conductor
using a field supplied lug.
• Use listed bonding hardware only.
• Size equipment grounding conductor per
NEC requirements and torque per manu-
facturer specifications.
Figure 5-1. Grounding Terminal Location
Installing to a Grounded Rail
• See Figure 5-1. Use two rail-compatible
fasteners (D) to secure the PV Link to the
grounded rail.
• Use a grounding washer (E) between the
rail and attachment flange to penetrate the
rail’s anodized coating.
• Torque fasteners according to the clip man-
ufacturer’s instructions.
Figure 5-2. Attaching to a Grounded Metal Rail
(000670)
WARNING
Hot Surfaces. Locate and install the PV Link so as to avoid
inadvertant contact. When operating in hot weather the
optimizer will become hot and could result in personal
injury.
(000657)
Equipment damage. Never leave the PV Link MC4
connectors open and exposed to the atmosphere overnight
or during rain. Doing so could cause equipment failure.
CAUTION
WARNING:ELECTRIC SHOCK HAZARD - THE DC CONDUCTORS OFTHIS PHOTOVOLTAICSYSTEM ARE UNGROUNDED AND MAY BE ENERGIZED.ELEC TRIC SHOCK HAZARD - DC OUTPUT CONDUCTORSMAY BE ENERGIZED REGARDLESS OF SUN EXPOSURE.
CAUTION: RISKOF ELECTRIC SHOCK - WHEN THE PHOTOVOLTAICARRAYIS EXPOSED TO LIGHT,IT SUPPLIES A DC VOLTAGETO EQUIPMENT.COVER PV MODULE IN OPAQUE MATERIALBEFORE CONNECTING OR DISCONNECTING THIS OPTIMIZER. DURING FAULT,ZERO CURRENT IS
SOURCEDINTO DC ARRAY BYTHIS CONVERTER. INSTALL IN ACCORDANCEWITH ALL LOCAL ORDINANCES. HOT SURFACE- TO REDUCE THE RISK OF BURNS-DO NOT TOUCH.RAPID SHUTDOWN: DEVICE AUTOMATICALLYDISCONNECTS PV ARRAY - LOSS OF GRID, MANUALSHUTDOWN FROM
CONTROLLER,OR ANY FAULTON REBUS™ DC NANOGRID WILL AUTOMATICALLYDISCONNECT ARRAYFROM GRID.
AVERTISSEMENT: RISQUEDECHOC ÉLEC TRIQUE - LES CONDUCTEURS DC DE CE SYSTÈME PHOTOVOLTAÏQUENESONT PAS RELIÉS À LA TERRE ET POURRAIENT ÉTRE SOUS TENSION. RISQUE DE CHOC ÉLECTRIQUE - LES CONDUCTEURS À SORTIE DC POURRAIENT ÊTRE SOUS
TENSIONINDÉPENDAMMENT DE LEURS EXPOSITIONS AU SOLEIL.
ATTENTION: RISQUEDE CHOC ÉLECTRIQUE - LORSQUE LE GÉNÉRATEURPHOTOVOLTAÏQUEEST EXPOSÉ À LA LUMIÈRE, IL FOURNIT UNE TENSION CONTINUE À L'APPAREIL.COUVREZLE MODULE PHOTOVOLTAÏQUED'UN MATÉRIAUOPAQUE AVANTDE BRANCHER OU DE
DÉBRANCHERCET OPTIMISEUR. EN CAS DE DÉFAUT,IL N'EXISTE AUCUN COURANT ENTRE CE CONVERTISSEUR ET LE GÉNÉRATEUR CONTINU.INSTALLEZ EN CONCORDANCE AVECTOUS LES RÈGLEMENTS LOCAUX. SURFACECHAUDE - AFIN DE REDUIRE LE RISQUE DE BRÛLURES, NE TOUCHEZ
PAS.SYSTÈME D'ARRÊTRAPIDE: L'APPAREILSE DECONNECTE AUTOMATIQUEMENTDU GÉNÉRATEUR PHOTOVOLTAÏQUE- EN CAS DE PERTE DE RÉSEAU,D'ARRÊT MANUEL DE COMMANDE ÉLECTRIQUE, OU DE DEFAILLANCE DU SYSTEME "REBUS™ DC NANOGRID,"LE GÉNÉRATEURSE
MAXCONT. OUTPUT POWER 2500 W
STANDBYPOWER <1W
RATEDPOWER INPUT VOLTAGE 200-360VDC
MPPT INPUT VOLTAGE 60-360VDC
MAXINPUT VOLTAGE 420V
MAXOUTPUT VOLTAGE 420V
OUTPUT REbus™DC Nanogrid
MAXAMBIENT TEMP 70°C
MAXOUTPUT OVERCURRENT PROTECTION 30 A
MAXINPUT CURRENT (OPERATING) 13 A @ 50ºC, 10 A @ 70ºC
MAXINPUT CURRENT (SHORT CIRCUIT ) 18 A
MAXOUTPUT CURRENT (CONTINUOUS) 8 A
MAXOUTPUT CURRENT (FAULT) 10A
ENCLOSURE TYPE3R
TOPOLOGY BOOSTCONVERTER
PROTECTIONS GFCI,Photovoltaic DC Arc-Fault
Circuit-Protection,Type 1,
PVRSS Controlled Conductor Connection Port
Refer to instructions for conditions of use
REbus DC Nanogrid
OUTPUT
PVRSS Controlled Conductor Connection Port
Refer to instructions for conditions of usee
PV Substring
INPUT
Input:
Max 420V temperature corrected Voc.
SINGLE STRING INPUT.
Dual string input requires approval.
Output:
Connect PV Links to inverter REbus
terminals in parallel.
ENCLOSURE MUST BE GROUNDED
for REbus communication
ENCLOSURE MUST BE GROUNDED
for REbus communication
IMPORTANT INSTALLATION INSTRUCTIONS:
Made in the USA
Conforms to UL1741, UL1699B
Certified to CSA C22.2 #107.1
≤420Voc
≤420Voc
PV Link / S2502
SnapRS™ compatible substring optimizer
PV rapid shutdown system equiptment
C
B
A
D
E

14 Installation Manual for PV Link and SnapRS
Connecting to Inverter
See Figure 5-3 . Connect each PV Link output
to the REbus DC nanogrid and inverter.
Figure 5-3. Connecting PV Link Optimizer
When connecting optimizers to the inverter:
• Do not reverse the input and output or
cross-wire polarity. To avoid confusion,
complete the wiring of the PV Link output
before installing PV modules.
• Do not connect PV Link optimizers in
series.
• Connect multiple PV Link outputs in paral-
lel. To connect PV Links in parallel:
– Connect all negative (RE-) PV Link
outputs on a home run together.
– Connect all positive RE (+) outputs
on a home run together.
• Current adds when connecting optimizers
in parallel. The maximum output current of
each PV Link is 8 A. When wiring PV Link
outputs to the inverter, observe tempera-
ture ratings and current-carrying capacity of
the wire used, including appropriate NEC
derating factors.
NOTE: Multiple home-runs will be necessary
in larger systems.
• Connect field wiring to the PV Link with
Staubli MC4 PV connectors only.
• Mark positive REbus field wiring leads with
red insulation or flagging.
• Mark negative REbus field wiring leads with
blue insulation or flagging.
• Connect multiple optimizers in parallel,
using MC4 branch connectors or a com-
biner box.
Connecting PV Modules
NOTE: Warranty does not cover water ingress
through wiring from external connections due
to poor wiring practices.
2014 NEC and Earlier Editions
For NEC 2014 compliant systems, connect
the substring PV modules in series.
To install PV modules in series to PV Link:
1. Connect the negative lead of the first mod-
ule in the string to the PV Link at the loca-
tion marked PV Substring Input (-). See
Component Locations for PV Input loca-
tion.
2. Connect the first module’s positive lead to
the second module’s negative lead.
3. Continue connecting the substring module
leads in series until the last module is
reached.
4. Connect the positive lead of the last mod-
ule in the substring to the PV Link at the
location marked PV Substring Input (+).
See Component Locations for PV input
location.
5. Make a string map using the serial number
stickers and record in Table 1: PV Link and
SnapRS Important Information the follow-
ing information:
– Each PV Link serial number
– Each PV Link RCP number
– Number of parallel strings
(000659)
Equipment damage. Connect the PV Link output to a REbus-
compatible device (± 190 VDC nominal regulated DC bus)
only. Connecting to conventional PV inverters or any other
device could cause equipment damage.
CAUTION
010027
(000657)
Equipment damage. Never leave the PV Link MC4
connectors open and exposed to the atmosphere overnight
or during rain. Doing so could cause equipment failure.
CAUTION
(000661)
Equipment damage. Never connect PV Link to any other
power source. The optimizer is designed to work with series
connected PV modules only. Connecting the optimizer to any
other power source could cause equipment damage.
CAUTION

Installation Manual for PV Link and SnapRS 15
2017 and 2020 NEC Compliant Sys-
tems
For NEC 2017 and 2020 NEC compliant sys-
tems, connect the string PV modules in a
series using one SnapRS device per module.
Installing SnapRS Devices
NOTE: Pre-install SnapRS devices to PV
modules to ensure a 1:1 ratio.
When installing SnapRS devices consider the
following:
• Each PV Link can control a connected
string of PV modules with a string voltage
between 60–420 VDC. For string sizing
guidance, see Installation Design Work-
sheet.
• The positive (+) end of one (1) SnapRS
device must be installed to the negative (-)
lead of each PV module in the array.
• PV modules require Staubli (Multi-Contact)
MC4 connectors. Brands other than Staubli
MC4 connectors are not recommended.
NOTE: MC connectors are not watertight
unless mated. Never leave this system par-
tially assembled.
• See Figure 5-4. PV modules are installed in
series with SnapRS devices connected
inline between each module.
• See Figure 5-5. High-voltage modules can
be configured in parallel strings.
NOTE: Install SnapRS devices prior to secur-
ing PV modules to the racking.
To install SnapRS devices:
1. See Figure 5-4. For each PV module in the
PV string, connect the positive (+) end of
one SnapRS device (C) to the negative (-)
whip of the PV Module (D).
2. Connect the negative (-) end of each
SnapRS device to the positive (+) whip of
the next PV module in the series.
3. Connect the PV string positive lead to PV
Link (B) at the location marked PV Sub-
string Input + (F). See Component Loca-
tions for more information.
4. Connect the PV string negative lead with
its connected SnapRS device to PV Link
(B) at the location marked PV Substring
Input - (E). See Component Locations for
more information.
5. Secure the SnapRS devices to the racking
or module frame using zip ties or a similar
fastener.
NOTE: When connecting the PV string to the
PV Link, the PV Link MC4 connector labeling
will indicate the same polarity as the PV string
connector (ex. PV Link positive (+) will con-
nect to the (+) whip of the first PV module in
the string). This will also be true with SnapRS
installed on the negative (-) whip. This is inten-
tional and differs from the connection method
for combining PV modules together with
SnapRS..
6. Make a string map using the PV Link peel-
and-stick serial number stickers and
record in Table 1: PV Link and SnapRS
Important Information the following infor-
mation:
– Each PV Link serial number
– Each PV Link RCP number
– Number of parallel strings
– SnapRS devices per string
– SnapRS date of manufacture.
Figure 5-4. Single-String PV Array with SnapRS Device
APWRcell Inverter DPV module
BPV Link EPV Substring Input -
CSnapRS Device FPV Substring Input +
C
A
E
F
B
D
C

16 Installation Manual for PV Link and SnapRS
NOTE: See Figure 5-5. When dual strings are connected in parallel, each string must use the
same number of the same type of PV modules, and there must be one SnapRS device for each
module in the array.
Figure 5-5. Parallel-Input PV Array with SnapRS Devices
APWRcell inverter DPV module
BPV Link EMC4 branch connector
CSnapRS device
E
E
B
A
D
C

Installation Manual for PV Link and SnapRS 17
Section 6 Operating Instructions
User Interface via Inverter
PV Link Information and control features are
available on the PWRcell inverter control
panel when REbus is energized. See the Gen-
erac PWRcell Inverter Owner’s Manual for
more information.
See Figure 6-1. To access the device page for
each PV Link, use left or right arrow buttons
(A) on the inverter control panel to scroll
through the pages. When on a PV Link device
page, press center button (B) to enable or dis-
able the device or to modify settings. The dis-
abled/enabled state does not affect
communication with the inverter.
NOTE: The PV Link only produces power after
the REbus DC nanogrid has been established
and the device has been enabled.
Figure 6-1. Inverter Control Panel
Commissioning the Rebus
System
The PV Link ships from the factory in a dis-
abled state. Each unit must be enabled from
the PWRcell inverter control panel. Once
enabled, the PV Link automatically detects the
REbus nanogrid and begins to export power
when the bus is within normal operating speci-
fications.
See the Generac PWRcell Inverter Installation
Manual for instructions on commissioning the
REbus system.
PVRSS Commissioning with
SnapRS Devices
To enable PV Link to work as a PVRSS with
SnapRS devices:
1. Press the right arrow button on the control
panel repeatedly until the device page
appears.
NOTE: The device page display should read
Disabled. If it does not read Disabled, press
the center button and disable the device.
2. See Figure 6-2. Press the center button
and select Mod. Settings to access device
settings and options.
3. Record the RCPn number in Table PV Link
and SnapRS Important Information, found
on the front cover of this manual.
Figure 6-2. PVRSS Commissioning (1 of 4)
4. See Figure 6-3. If installing a dual string
array, select Mod. Settings and update the
String Count value to 2.
Figure 6-3. PVRSS Commissioning (2 of 4)
5. See Figure 6-4. Press the center button
and select Enable w/PVRSS to enter the
Testing PVRSS state.
Figure 6-4. PVRSS Commissioning (3 of 4)
REbus Inverter
Internet
Shutdown
(hold)
009894
B
A
Disable
PV Link S2502 Menu
Mod. Settings
Enable w/PVRSS
RCPn: 00010003XXXX
< EXIT SCROLL > NEXT • SELECT
PLM Channel:
Vin Startup:
String Count:
Cancel Commit
off
120.0V
2
Enable PVRSS: 1
Disable
PV Link S2502 Menu
Mod. Settings
RCPn: 00010003XXXX
< EXIT SCROLL > NEXT • SELECT
Enable w/PVRSS