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Ok. Good luck drawing 200 amps for hje heat pump from a standard 70-100ah lead acid starter battery for more than a few seconds. It would be tha eqvivalent of driving your gas car on the starter engine. I guess you would go through a lot of trouble, and a lot of expensive big atea wiring...

Dude no. It does not work like that. You need to read up. You need about 2-6 kW to generate any kind of cabin heat. That is about eqvivalent of what the car i drawing out of the traction battery for driving on flat. The 12V keeps interior instruments and light on. Thats about it. Get a bigger...

Dont listen to the Naysayers. I think this is an awesome idea, and i would like to try it out myself as i have just swapped my old gen1 63% SOC pck forva fresh one. This has been done on a large scale in a massive battery park in California, but to do it "Down and dirty" DIY i guess one would...