(I've searched for an answer to this, to no avail. Feel free to link to something I might have missed.) Rented a nice place in the woods on the north coast of California for a few days. Everything around here is old wooden cottages. Including the one we have for two nights. The birds are singing, the ocean rumbling in the distance, it is pretty awesome. The garage has NEMA 5-15 outlets, you know standard 120 volt outlets, with a ground. Not a newer 5-20 (you know, the one with the notch in your bathroom) or anything better in sight. The place definitely dates from the 1970s or a bit earlier. From the lack of anything but 5-15 all over, and the look of the wall plates, electrical is from that vintage. I want to get a trickle charge going, but I don't want to die a fiery death overnight by stressing an unknown and old electrical outlet, system and panel. I've set the charge to be 6 of the 12 amps available. What would yo do?