For the AC200L Custom UPS: the “Charging” slider doesn’t seem to work as expected.
My understanding is:
- when Charging is “Off”, the grid will only be used to bypass the load, starting when SOC discharges to the SOC Low threshold. Since the load is bypassed by grid, SOC will remain at SOC Low until solar charges the battery to SOC High.
- when Charging is “On”, the grid is used to charge the battery to SOC High, starting when SOC discharges to the SOC Low threshold (is it charges battery in addition to helping bypass the load).
However, when Charging slider is “Off”, the desired behavior doesn’t occur: SOC continues to drift below SOC Low value, all the way until the battery discharges.
In other words, the grid’s bypass load matching isn’t exact and is smaller than the load, so SOC continues to drop forever (though more slowly than if bypassing wasn’t occurring).
For example, I have SOC Low set to 10%. And when SOC reaches 10%, I see grid load bypass turning on, and trying to match my ~100-150W load. But, SOC continues to drop all the way to 5%, since it seems to not be bypassing correctly.
So I had to manually turn the Charging slider to On to prevent the unit from discharging to 0.
Why isn’t SOC staying near 10% when Charging is set to Off?
Is my understanding above correct, on what should occur when Charging slider is set to Off? If so, then the load bypassing isn’t working as expected.