sizing and BMS Help

bytlan

I got an RV solar setup at 600w of panels. I had a 12v golf cart battery/inverter (3000w) 110v AC set up. I am looking or thinking to change it all. Now looking to go LiFePO4. I have 4 - 300Ah 12v batteries. 1 also have a bad BMS on 1. I'm thinking I need to crack it open, the 1 battery or all 4 and fix with some other BMS set up?

Here are the specs I have on the battery:

Specifications

Battery type: LiFePO4 Battery

Delivery date: 2023

Nominal voltage: 12.8V

Nominal capacity: 300Ah

Maximum charging current: 50A

Instantaneous discharge current: 200A

Continuous discharge current: 100A

Life: ≥6000 cycles or more

Charging temperature: 0~45°C

Discharge temperature: -20~60°C

Storage temperature: -20~65 °C

Size: 310*193*172mm (+/-10mm)

Operating voltage range: 10.0 V-14.6 V

Overload protection voltage: 14.6 V 0.05 V

Protection voltage against overload: 10.0 V 0.05 V

Protect battery temperature: 60°C plusmn 5°C

Output and parameters: high current positive / negative connection column (red positive, black negative);

Package includes:

1pcs 12V/12.8V 300Ah High capacity lifepo4 Battery pack, with BMS build-in.

1pcs charger

China Made Batteries with no more support - learned the hard way. RV AC unit works on a 5000w generator. Could I have enough power to run this AC unit and how long? And any ideas as to changing to a 24v or 48v Inverter for the system change? And what is my best method for repairing or replacing the BMS for the 1 or all those batts via cutting them open?  Any Help??