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 Generac
Inverter control panel. See the Generac PWRcell Inverter
Owner’s Manual for more information on using the
inverter control panel.
Table 2-2. Battery State of Charge Setpoints
Setpoint
Behavior
Max Absolute
Maximum percent the Generac PWRcell Battery can charge to. When battery SoC reaches this value,
the Generac PWRcell Battery will not charge from any source.
•
Default value is 100%.
•
Lowering this setpoint reduces usable capacity and is not recommended.
Minimum Reserve
SoC
Manages battery capacity by prioritizing where PV power goes. When battery SoC reaches this value,
PV power is diverted from charging the Generac PWRcell 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 could 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.
Maximum 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 Generac PWRcell 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 related modes, but increases
islanding reserve in case of a grid outage.
Min Absolute
Shut off point where the Generac PWRcell Battery stops discharging. When battery SoC drops below
this value, the Generac PWRcell Battery shuts off and will not discharge further. If the grid is present,
then the Generac PWRcell Battery will charge as soon as power is available on REbus. If the grid is not
present and the system is islanding, then the Generac PWRcell will go to sleep and performs a Power
Search periodically. See
•
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 Generac PWRcell
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 Gen-
erac PWRcell Battery page, and press center but-
ton to enter the Generac PWRcell Battery menu.
2.
Use the up and down arrows to highlight Mod. Set-
ting, and press center button to enter the Mod. Set-
tings menu
3.
Use up down arrows to highlight the desired SOC
setpoint, and press center button to select.
4.
Use up and down arrows to adjust set point value.
5.
Press 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 Commit.
7.
Press center button save the setpoint change.
009656
009895
Figure 2-6. SoC Setpoint Screen Example
