Configure Inverter for off grid solar system

[marlinb619]

Hey guys, I'm using 2 of the BluePower SP6548 SOLAR INVERTER and 6 of the EG4 (48V/100AH) LL Battery.
The inverters switches to the grid mode when the batteries runs out of power (0% SOC). How can I make my inverters switch to grid mode when the batteries are about 10% of charge?
Please see attached files for the inverter and battery manuals.

 

[Hedges]

Inverter manual says, "If “User-Defined” is selected,battery charge voltage and low DCcut-off voltage can be set up inprogram 26, 27 and 29."

"12 Setting voltage point back toutility source when selecting“SBU” (SBU priority) inprogram 01.Available options for 48V model:46V (default) Setting range is from 44V to 51V.Increment of each click is 1V."

"29Low DC cut-off voltage: If battery power is onlypower source available,inverter will shut down. If PV energy andbatterypower are available,inverter will chargebattery without ACoutput. If PV energy, batterypower and utility are allavailable, inverter willtransfer to line modeand provide outputpower to loads.48V model default: 44.0VIf self-defined is selected in program 5, this program can be setup. Setting range is from 42.0V to 48.0V for 48V model.Increment of each click is 0.1V. Low DC cut-off voltage will befixed to setting value no matter whatpercentage of load is connected."

I don't think it tracks Ah and SoC, but you may be able to set a voltage in the lower knee of LiFePO4 curve to do about what you want.

 

[sunshine_eggo]

If communications are setup, settings 12 and 13 should indicate SoC instead of voltage.