Generac Power Systems PWRcell Reference Manual page 7

Figure 1-2. Self Supply (1 of 3)
See 1-3. When the battery is full and a surplus of
Figure
power is available, that surplus is exported to the grid.
Figure 1-3. Self Supply (2 of 3)
See Figure 1-4. 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
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 1-4. Self Supply (3 of 3)
Diagnostic Repair Manual
Clean Backup
NOTE: Grid power is not used to charge batteries in this
mode.
See
Figure
prioritizes keeping the battery charged and ready for a
grid interruption using solar power only. If the battery is
not fully charged, the inverter uses all available solar
power to charge the battery. PWRcell Batteries will not
export to grid in this system mode.
See Figure 1-6. When the battery is fully charged, solar
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power will flow to local loads and the grid.
Figure 1-5. Clean Backup (1 of 2)
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Figure 1-6. Clean Backup (2 of 2)
See 1-8. If there is a utility service interruption
Figure
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
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battery charging. PWRcell Batteries will not export to grid
in this system mode.
Section 1 The PWRcell System
1-5. In Clean Backup mode, the inverter
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