Owner’s Manual for Generac PWRcell Battery 9
General Information
Battery State of Charge (SoC) Setpoints
There are four user-adjustable setpoints related to the battery state of charge (SoC): Max Absolute, Max Arbitrage, Min
Arbitrage, and Min Absolute. These setpoints are adjusted through the inverter control panel. See the Generac
PWRcell Inverter Owner’s Manual for more information.
Table 2-2. Battery State of Charge Setpoints
Setpoint Behavior
Max Absolute
SoC
Maximum percent the battery can charge to. When battery SoC reaches this value, the battery will not
charge from any source.
• Default value is 100%.
• Lowering this setpoint reduces usable capacity and is not recommended.
Maximum
Reserve SoC
Manages battery capacity by prioritizing where PV power goes. When battery SoC reaches this value,
PV power is diverted from charging the battery to powering local loads, saving battery capacity
available for charging for a later time. When power can not be exported to the grid, this extra capacity
can be used to absorb peak PV so that PV wasn’t wasted due to a fully charged battery.
• Default value is 100%.
• Changing this value is only recommended in very specific arbitrage situations.
Minimum
Reserve
SoC
Manages the reserve of power guaranteed to be available for local loads in the event of a grid outage.
When battery SoC drops to this setpoint, the battery will no longer power local loads as long as the grid
is still present.
• Default value is 30%.
• Lowering this setpoint increases battery capacity available for Self Supply and other non-backup
uses, but lowers the islanding reserve in the event of an outage.
• Raising this setpoint lowers capacity available for Self Supply and grid-connected modes, but
increases islanding reserve in case of a grid outage.
Min Absolute
SoC
Shut off point where the battery stops discharging. When battery SoC drops below this value, the
battery shuts off and will not discharge further. If the grid is present, then the battery will charge as
soon as power is available on REbus. If the grid is not present and the system was islanding, then the
system will go to sleep and perform a Power Search periodically. See Power Search.
• Default value is 2%.
• If this setpoint is lowered, the system can provide more energy before it goes to sleep, but the
Power Search reserve will be smaller.
• If this setpoint is raised, the system may shut down sooner during an outage, but the Power Search
reserve will be larger.
Adjusting SoC Setpoints
SoC setpoints are adjusted on the inverter control panel.
See the Generac PWRcell Inverter Owner’s Manual for
more information.
To adjust SoC setpoints:
1. Use
the left and right arrows to access the battery
page, and press center button to enter the battery
menu.
2. Use th
e up and down arrows to highlight Mod. Set-
ting, and press center button to enter the Mod. Set-
tings menu.
3. Use up an
d down arrows to highlight the desired
SoC setpoint, and press center button to select.
4. Use up a
nd down arrows to adjust set point value.
5. Pr
ess center button to lock value.
6. Use
down arrow to scroll to the bottom of the list
where Cancel is highlighted, then press right arrow
to highlight Save.
7. Pre
ss center button save the setpoint change.
PLM_Channel:
MinSoCAbs:
MaxSoCAbs:
Cancel Save
1
2.0%
100.0%
MinSoCRsrv: 30.0%
Figure 2-6. SoC Setpoint Screen Example
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