Before we had our solar installed and they day of having it wired in. We used it to keep the fridge cold and the Internet going. As well has my husband’s computer for work. Randomly we have used it to air up friends tires when they had flats in remote spots. But lately it’s not been used at all.
Depends on the ev and the evs trim package. Our ev6 uses a resistance heater for initial heat the swaps over to a heat pump that sources it’s heat from the battery pack, motors and other electronics for heat. Newer Teslas use only a heat pump. Older Teslas use resistive heat only. Some cats only had resistance heat some heat a coolant loop then it goes through a heater core.