I have a couple of these bluetooth module BMS units ranging from 30 amps to 100 amps.
I charged a 57ah (usable) pack up to 3.46VPC last night which made the BMS read 100%, 57/57ah remaining. I disconnected all charging and load and went to bed. This morning that pack reads 50ah remaining / 89%.
I'm fairly certain this is due to the settings in the Xiaoxiang BMS app for 80% Cap Voltage, 60, 40, 20%. The pack rested after charge, voltage dropped, and the BMS is now relying on those capacity voltages I entered.
Is this normal behavior? If I discharge 30 amps with a constant load, my math and the BMS are accurate, like it's actually using current out to determine SOC. But let it rest and that number could be completely different the next time I open the app. Oddly enough I don't have any of this happening with my larger Lifepo4 setup using their 60amp bms, but all my 30amp packs do this.
I charged a 57ah (usable) pack up to 3.46VPC last night which made the BMS read 100%, 57/57ah remaining. I disconnected all charging and load and went to bed. This morning that pack reads 50ah remaining / 89%.
I'm fairly certain this is due to the settings in the Xiaoxiang BMS app for 80% Cap Voltage, 60, 40, 20%. The pack rested after charge, voltage dropped, and the BMS is now relying on those capacity voltages I entered.
Is this normal behavior? If I discharge 30 amps with a constant load, my math and the BMS are accurate, like it's actually using current out to determine SOC. But let it rest and that number could be completely different the next time I open the app. Oddly enough I don't have any of this happening with my larger Lifepo4 setup using their 60amp bms, but all my 30amp packs do this.
