Hello. Recently I kicked up some simple system for home usage with one 12v 150ah LiFePO4 battery and MultiPlus 12/1600/70-16, also added VRM portal connectivity. The battery has its own bms system without any cable connection capabilities, just bluetooth and a separate app for it. The battery description says that the max charging current - 75A and max voltage is 14.6. My MultiPlus config looks like this:
A few hours after charging the battery to 100%. I have this picture on the VRM portal.
First question. Why does MultiPlus indicate battery current consumption?
Second question. When I leave a battery in this state without charging and using it (only grid power), after a few days VRM shows the battery SoC on something around 80%, but BMS app shows 99%. As I understand the battery voltage moving slowly to 13.6 - 13.8V (full charge regular voltage) which is the normal behaviour for LiFePO4 battery, but MultiPlus consider this transition also as discharging, because the "State of charge when Bulk finished" is 95% is based on charging voltage. Do I need some additional sensors for the battery like a smart shunt to fix this issue, because I can't find any related setting for MultiPlus battery monitoring related to that?