Priority Backup; Self Supply - Generac Power Systems XVT076A03 Installation And Owner's Manual

See Figure 7-9. If there is a utility service interruption
while operating in Clean Backup, the system will enter
Island Mode. Protected loads will be supported by solar
and battery power. If enough solar power is available,
solar will simultaneously charge the battery and support
the loads.

Priority Backup

In Priority Backup mode, the inverter prioritizes keeping
batteries charged and ready for grid interruption using
solar or grid power. If the battery is not fully charged, all
available solar power is used to charge the battery. When
the available solar power is lower than the battery input
power rating, the inverter uses grid power to expedite
battery charging. PWRcell Batteries will not export to grid
in this system mode.
See Figure 7-5. If solar and grid power are available,
both can charge the battery. The system displays the
amount of power being drawn from the grid and the
amount of power being consumed by local loads before
reaching the battery.
Figure 7-5. Priority Backup
See Figure 7-9. If there is a utility service interruption
while operating in Priority Backup, the system will enter
Island Mode. Protected loads will be supported by solar
and battery power. If enough solar power is available,
solar will simultaneously charge the battery and support
the loads.

Self Supply

NOTE: This feature requires CTs to be properly installed
and calibrated prior to use.
In Self Supply mode, the inverter prioritizes powering
local loads first using solar and/or stored power. This
mode is optimal in markets where net metering is
unavailable or unfavorable, making battery-stored power
more economically attractive than power from the utility
grid.
See 7-6. If more power is being produced by the
Figure
solar array than is needed by local loads, the inverter
stores the energy in the battery for later use.
Installation and Owner's Manual for Generac PWRCell Inverter
Figure 7-6. Self Supply (1 of 3)
See 7-7. When the battery is full and a surplus of
Figure
power is available, that surplus is exported to the grid.
Figure 7-7. Self Supply (2 of 3)
See Figure 7-8. When local demand exceeds available
solar power, the battery will discharge to offset the
demand. If the building requires more power than the bat-
tery and solar can provide, the excess demand is drawn
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from the grid.
Operating in Self Supply mode, the battery will discharge
on a daily basis to the minimum reserve setting on the
PWRcell Battery. The setting MinSocRsrv comes default
set to 30 percent. This means a system operating in Self
Supply, while grid connected, will only use up to 70 per-
cent of the battery's stored capacity, leaving at least 30
percent available for Island Mode in the event of a utility
service interruption.
Figure 7-8. Self Supply (3 of 3)
System Operation
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