Comment by hedora

I’ve often wondered:

It’s -30C and the heat pump doesn’t really work. Is there any advantage to heating the cold side with, say, a resistive heater?

Conservation of energy says no, but what if it’s also being heated by waste heat from charging the batteries?

(Maybe the answer is “if that’s the case, you are actively cooling the batteries with the heat pump!”, but I’d like to think someone more clever than me could make the scheme work.)