Photovoltaic Rapid Shutdown; Pvrss Initiation - Generac Power Systems PWRcelP XVT076A03 Installation And Owner's Manual

Location and Standards

Photovoltaic Rapid Shutdown

The PV Link, SnapRS, and PWRcell Inverter are certified as Photovoltaic Rapid Shutdown Equipment (PVRSE).
Review Table 3-2: PVRSS Requirements and PWRcell PVRSE
constitute an effective Photovoltaic Rapid Shutdown System (PVRSS). Refer to Generac PV Link & SnapRS Installa-
tion manual for more information on proper installation of those devices including commissioning instructions.
NEC Adoption
2011 or older
2014
2017, 2020 and follows
*Depending on approved method used, the PVRSS may include the Generac PWRcell Inverter but the inverter is not required for an effective
PVRSS.
Following PV rapid shutdown initiation, controlled conductors will be brought within the limits defined in NEC 690.12 as
described in above. The controlled conductors include:
Table 3-2
•
REbus conductors connecting PV Link(s) to the PWRcell Inverter (conductors leaving the array).
•
PV conductors between modules in PV Link PV substring (conductors inside the array boundary).
NOTE: AC conductors exiting and entering the inverter are not considered controlled conductors for this application.
NOTE: Depending on the installation conditions (panel type, ambient temperature, etc.), leakage current methods
detailed in UL 1703, Section 21 may be used to indicate compliance with the stated limits as permitted by UL 1741,
Section 93.1.2.

PVRSS Initiation

There are three approved methods for initiating PV rapid shutdown with PWRcell equipment. Each method effectively
disconnects the PV input circuits from the inverter's internal DC bus. This disconnection is detected by the PV Links,
which in turn interrupt the PV source circuits. Interruption of the PV source circuits opens SnapRS devices, isolating PV
modules within the array. All three methods are considered suitable for installations where the inverter is located
outside of a one-family or two-family dwelling. In most situations, only Method 2 (external switch) or Method 3 (installer-
sourced DC disconnect) will be appropriate for installations where the Inverter is located inside of a one-family or two-
family dwelling (where the external device is located outside of the dwelling near the utility service entrance).
Appropriate signage and/or markings in compliance with NEC 690 must be provided by the installer.
Method 1 - PVRSS initiation via PWRcell Inverter DC disconnect(s) (outdoor installations)
Open the inverter lid.
1.
Locate the PWRcell DC disconnects located to the left of the Generac Power Core.
2.
Turn DC disconnects connected to PV sources to the OFF position.
3.
Method 2 - PVRSS initiation via external switch connected to inverter STOP terminals (indoor and outdoor
installations)
NOTE: If installation includes a PWRcell Battery, the battery must be equipped with external STOP terminals. Battery
STOP terminals must be wired in series or parallel to the inverter STOP terminals. See PWRcell Battery Installation
& Owner's Manual for more details.
A UL listed, 12 VDC, 5 mA, lockable, weatherproof switch must be connected to the STOP terminals to use this
1.
method.
10
Table 3-2. PVRSS Requirements and PWRcell PVRSE
PVRSS Requirements (NEC 690.12)
No PVRSS requirements.
Controlled conductors leaving array limited to not
more than 30 volts within 10 seconds of rapid
shutdown initiation.
Controlled conductors leaving array limited to not
more than 30 volts within 30 seconds of rapid
shutdown initiation.
Controlled conductors located inside the array
boundary (or not more than 1 m (3ft) from the
point of penetration of the surface of the building)
shall be limited to not more than 80 volts within 30
seconds of rapid shutdown initiation.
to determine what PWRcell equipment is required to
Required PWRcell PVRSE*
Installation and Owner's Manual for Generac PWRcell Inverter
N/A
Generac PV Link(s)
Generac PV Link(s),
Generac SnapRS
(one per PV module)