Motorhome is at the shop, ill get more info off the box when i get it back. Sorry im not well versed in this sort of thing. We tested the battery at the shop, im not sure how much load was put on it or if it was a carbon pile tester or not. I have the paperwork on the converter or inverter iwhichever it is ill look through it in a bit to find out for sure, but i do know it is the original one for the motorhome. Which is a 84 national dolphin. The box rating is 50 and it has two breakers a 15 and a 20 installed.