I have portable panels with my Jackery. Two hundred watt panels would be the max a normal car could handle. Then you have to park in a place with optimal sun e

I have portable panels with my Jackery. Two hundred watt panels would be the max a normal car could handle. Then you have to park in a place with optimal sun exposure to max out. Even at max, that's only enough power for hvac, and it won't be great in long cold Winters. Its probably more efficient to spend the panel money on a slightly larger battery.