Boomerweps wrote:
You could use jumper cables to parallel your house battery with your vehicle battery and let it charge your vehicle battery BUT LiFePO4 batteries are not made for starting heavy motors, like an engine starting motor. The power surge could cause the BMS to shut down the house battery, then you’re really screwed.
Most auto parts stores will test your battery and alternator because they want to sell parts. Let them test it.
LiFePO4 batteries can be made for high current or .. Well I have a small (10 amp hour capacity) that has started 3 cars with dead batteries so far (Strangely never my car).
I used to use a 27 amp hour AGM for jump starts.. Not always successful.
Normally I use a 73 amp hour maintenence free to start my car (The car's battery)
I have a 12 amp hour LiFePO4 I normally pull up to 25 amps off of with no problem.
A 200 AH LiFePO4 should have no problem at all jumping a car.
The resting voltage of the LiFePO4 is a bit low for charging a 12 volt Lead Acid. the Charging voltage is on the high side for that job but about what GM sets their voltage regulators at (Based on owning GM vehicles and reading the voltage on a digital meter)
