Section 6 Pv Link And Snaprs; Device Profiles - Generac Power Systems PWRcell Reference Manual

PV Link and SnapRS
Section 6

Device Profiles

Generac PV Link
Where other manufacturers use micro-inverters or solar optimizers for each solar panel, Generac's PV Link optimizes
several panels at once connected as a substring. The PV Link is a DC-to-DC converter that uses Maximum Power
Point Tracking (MPPT) to boost power onto REbus. It also detects for arc faults and ground faults within the array. And
as a key component of the Photovoltaic Rapid Shutdown System (PVRSS), the PV Link commands SnapRS devices to
close and open, maintaining a count of the SnapRS in its substring using an algorithm based on resistance.
SnapRS
SnapRS devices are normally open, frequency-controlled switches that attach to the negative lead of each solar panel
to achieve module-level rapid shutdown upon initiation of the PVRSS. SnapRS devices are required for all installations
where NEC adoption is 2017 and higher.
B
C
D
A
Attachment Flange Slots
B Grounding Terminals
C REBus DC Nanogrid Output Negative (-) Lead
D REBus DC Nanogrid Output Positive (+) Lead
String
See Figure 6-2. PWRcell equipment uses a substring topology to facilitate power production from the solar array
through the inverter to the consumer loads. One "string" for PWRcell equipment consists of one home run (A) back to
the inverter and up to three series substrings for a total of up to three PV Links.
Diagnostic Repair Manual
A
E
F
G
Figure 6-1. Generac PV Link and SnapRS Device
A
Figure 6-2. One String with Three Series Substrings
H
010023
E
PV Substring Input Negative (-) Lead
F PV Substring Input Positive (+) Lead
G MC4 Connectors
H Positive PV Connector
J Negative PV Connector
2 mods
>60 VDC

Section 6 PV Link and SnapRS

J
9 mods
<420 VDC
010050
25