ESS GX system, 5kW MP-II, 3kW SmartSolar, just 5kWh LFP battery (no networked BMS).
The battery has a high internal resistance and as soon as charging at over 20A, it’s voltage peaks to the bulk set voltage, hence percentage jumps from whatever calculated value to the set percentage as set on “State of charge when Bulk finished” by VEconfigure on the MP-II.
Is there a way to disable this adjustment of percentage?
I’ve adjusted “State of charge when Bulk finished” to 60% (because that’s roughly where it really is), but now SoC jumps all the way to 100% for some reason half an hour later, while the battery still sips 1kW of power for at least two hours.
Only thing I can think of regarding the 100% jump, is that the BMS kicks in and cuts off charging for a blink, so Victron translates this as full. Depending on your perspective, that could make sense, so I will be trying to cap charge current a bit and see how it goes.
However, SoC with no adjustments could also be an option. Is it really that difficult to leave SoC alone and only adjust it according to the measurements made by the interal MP-II coulomb meter?