A car alternator is typically 2kW-3kW at most, and is very roughly 50% mechanically efficient, so it uses 4-6kW of mechanical power. Ie: 1/18th of the 150hp (1

A car alternator is typically 2kW-3kW at most, and is very roughly 50% mechanically efficient, so it uses 4-6kW of mechanical power. Ie: 1/18th of the 150hp (111kw) engine's capacity...about 5%. Cars are already designed to run A/C and alternator almost continuously, and the AC not only generates load, it pumps a lot of heat into the air coming through the radiator because the condenser is in front of the radiator. They're designed (if the manufacturer did their environmental testing properly) to do that even in ~110+ degree weather. Methinks you should stick to things you know something about. PS: Many cars, even regular passenger cars - can handle being driven around a track, where you can go through a full tank in under an hour's worth of driving, and are either on the gas or braking during most of the session. There are also things called hills and mountains, which may take minutes to climb, or more. Plenty of cars make it up the Mt. Washington auto road (where the challenge is making it back down without overheating one's brakes; engine braking must be used.) There's something called "towing", which lots of people do the world around with minivans and passenger cars (not just pickups and SUVs.)