So this guy showed up to my house and asked me if he could charge his trailer batteries- all 7 of them. So I said ok, figured I'd help the guy out.Well hes come back a couple times, Hes using a makeshift 70 amp charger for about 3 hours at a time and connects all the batterys together using very thin wire....I was wondering how much power/ money this charging will cost though the power bill cause I don't want my power bill racked up because of him. Any help would be great.
Thanks