Managed Whole Home Backup - Generac Power Systems PWRcelP XVT076A03 Installation And Owner's Manual

Electrical Connections

Managed Whole Home Backup

When configured to operate with a PWRcell ATS installed
directly after the utility service meter, a PWRcell system
can provide power to the main distribution panel during a
utility service interruption using PWRmanager or some
other energy management
management.
When a service interruption occurs, relays insides the
inverter isolate the inverter's AC grid connection, the
transfer switch transfers to the inverter as a power
source, and the inverter supports main panel loads using
PV and battery power. The ATS transfer typically takes a
fraction of a second but may take up to a few seconds
depending on how the grid service is interrupted.
In this configuration, the PWRcell Inverter will control the
PWRcell ATS upon loss of utility voltage.
NOTE: This configuration is not suitable for three phase
installations. This includes panels powered by feeders
carrying 2 of the 3 phases.
A PWRcell system configured to operate with a PWRcell
ATS can accommodate up to 9 kW – 11 kW maximum
continuous load. This requires at least 6 – 8 battery
modules, respectively, to be installed in one – two
PWRcell Battery cabinets. Please reference pertinent
product specifications for desired configuration.
Install a PWRmanager for dynamic load management to
prevent overloading the PWRcell system during an
outage. Install Smart Management Modules (SMMs) on
additional circuits as needed with PWRmanager, or
utilize the PWRcell ATS Controller with SMMs for smaller
applications where PWRmanager may not be required.
IMPORTANT: A qualified installer must ensure proper
load management so as not to overload the PWRcell sys-
tem as an optional standby power source in any man-
aged whole home backup installation. See
for additional details on load management
Equipment
options.
General Wiring Guidance:
1. See
Figure 5-9. Land service entrance conductors
at the 'N' terminals of the PWRcell ATS.
2. Land new feeder conductors from the 'T' terminals
of the PWRcell ATS to the Line side of the main
distribution panel.
3. Land the PWRcell Inverter protected loads wiring
(L1 Protcd / L2 Protcd) to the 'E' terminals of the
ATS.
4. Land the protected loads neutral (N2 Protcd) to the
neutral bar in the ATS.
5. Land an equipment grounding conductor from the
PWRcell Inverter to the ATS ground bar.
6. Install a 2-Pole 40 A over current protected device
(OCPD) for interconnection of the PWRcell Inverter
at the AC Main Panel.
22
equipment for load
Other
7. Land Inverter AC Grid Connection wiring (L1 / L2)
to OCPD for interconnection.
NOTE: Improper installation of a PWRcell ATS can result
in an objectionable current path through a paralleled
neutral connection. Reference NEC 250.6. The neutral
conductor for the inverter AC Grid Connection circuit is
not required to be installed to the point of common
coupling with the utility as permitted by the exception in
NEC 200.3. Follow the PWRcell ATS Installation
Manual for proper
responsible for compliance with applicable national,
state, and local codes.
8. Run Cat 5 or Cat 6 from the PWRcell ATS
Controller to the PWRcell Inverter for ATS controls.
9. Install CTs inside the PWRcell ATS and run Cat 5
or Cat 6 from the PWRcell ATS Controller to one of
the inverter CTs ports.
10. Install HVAC 24 V thermostat wiring at the
PWRmanager (if installed) to manage HVAC loads.
Otherwise, install HVAC 24 V thermostat wiring at
the PWRcell ATS Controller.
NOTE: Reference the PWRcell ATS Installation Manual
if using the PWRcell ATS Controller to manage HVAC
loads. The 24 V HVAC relays on the PWRcell ATS
Controller are not compatible for use with PWRmanager.
11. Wire 240 V loads to PWRmanager (if installed) to
manage large house loads. Otherwise, install
SMMs for 240 V loads.
12. Wire any 120 V loads to PWRmanager (if installed)
to manage those 120 V loads.
NOTE: When installed with PWRmanager, SMMs should
be used with lockout switch set to "Lockout Load on
Generator" only.
NOTE: Class 2 low voltage cable shall be installed
independent of other power conductors. See NEC
725.136 for additional information.
Installation and Owner's Manual for Generac PWRCell Inverter
installation. The installer is