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User's Guide
Battery State of Charge (SoC) Setpoints
There are four user-adjustable setpoints related to the battery state of charge (SoC): Min Absolute, Max Absolute, Min
Reserve, and Max Reserve. These setpoints are adjusted through the inverter control panel.
Setpoint
Shut off point where the battery stops discharging during a utility service interruption. When battery SoC
reaches this value, the battery will go to sleep. The battery will charge again as soon as power is available
on REbus. If the grid is not present and the system was islanding, the system will perform a Power Search
every hour for four minutes. See
Min Absolute
•
SoC
•
If this setpoint is raised, the system will go to sleep sooner during an outage, but the Power Search
reserve will be larger.
Maximum percent the battery can charge to. When battery SoC reaches this value, the battery will not
charge from any source.
Max Absolute
•
SoC
Lowering this setpoint reduces usable capacity and is not recommended.
Manages the reserve of power guaranteed to be available for local loads in the event of a a utility service
interruption while operating in Self Supply system mode. When battery SoC drops to this setpoint, the
battery will stop discharging to power local loads, retaining the minimum reserve for backup power in the
event of a utility service interruption.
Min 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 and export to the grid, saving battery
capacity available for charging at a later time. When excess power is not needed by local loads and can
not be exported to the grid, this extra capacity can be used to absorb peak PV to mitigate potential
Max Reserve SoC
clipping.
•
Changing this value is only recommended for appropriately sized systems.
Adjusting SoC Setpoints
SoC setpoints are adjusted using the inverter control
panel. See the Generac PWRcell Inverter Installation and
Owner's Manual for additional information regarding
inverter control panel operation.
To adjust SoC setpoints:
1. Use the left and right arrows to access the battery
device page, and press center button to enter the
battery menu.
2. Use the up and down arrows to highlight Mod.
Settings, and press center button to enter the Mod.
Settings menu.
3. Use up and down arrows to highlight the desired
setpoint, and press center button to select.
4. Use up and down arrows to adjust setpoint value.
5. Press center button to deselect the setpoint.
6. Use down arrow to scroll to the bottom of the list
and select Save.
36
Table 6-2. Battery State of Charge Setpoints
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.
Default value is 100%.
Default value is 30%.
Lowering this setpoint increases battery capacity available for Self Supply, but decreases the capacity
reserved for backup power in the event of a service interruption.
Raising this setpoint decreases battery capacity available for Self Supply, but increases capacity
reserved for backup power in case of a utility service interruption.
Default value is 100%.
Behavior
Power
Search.
PLM_Channel:
MinSoCAbs:
MaxSoCAbs:
MinSoCRsrv:
Cancel
Figure 6-3. SoC Setpoint Screen Example
100.0%
Save
Owner's Manual for Generac PWRcell Battery
1
2.0%
30.0%
009895
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