Battery Bank/BmS issues questions

I have 16 of the LifePo4 100amp 3.2 volt cells hooked up to give me 400 amp hours at 12volts. I use the 120a 12v 4s BMS from overkill. I also have a 3000 pure with 6000 surge inverter. Everything works well until 1. I start pulling around 1500-1600 watts. The BMS shuts batteries off. 2. If I go skiing and temperatures go below freezing it not only shuts batteries off, but they are completely dead when temperatures get above freezing. I understand the temperature protection shuts them off but confused why the are dead when temperatures go back. My 400 watt panels charge them up usually by the end of the day. But no breakfast and coffee in the cold sucks. Solution greatly appreciated. I don’t want to go 48v battery set up because inverter is 12v. Thank you

The BMS shuts off at around 1500W because at 12V it requires 125Amps to feed the Inverter the required power. Your BMS is doing its job, you need a bigger BMS, at least 200A. This is the reason 24V Inverters are favorable once you get into the 3000W range. Not sure why the batteries would be dead just because they went below freezing and then heated back up. Perhaps its the way you are taking the measurements?

BentleyJ said:

The BMS shuts off at around 1500W because at 12V it requires 125Amps to feed the Inverter the required power. Your BMS is doing its job, you need a bigger BMS, at least 200A. This is the reason 24V Inverters are favorable once you get into the 3000W range. Not sure why the batteries would be dead just because they went below freezing and then heated back up. Perhaps its the way you are taking the measurements?

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Thank you

Jasondrumguy said:

Thank you

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Anyone know where to get a 12v 200a BMS for lithium

This forum a thread dedicated to BMS issues specifically. Not endorsing any of these, FYI only.
Chargery, Daly, Current Connected, Electrodacus, QUCC, GWL, Overkill, JK BMS, Batrium.