I am on the market for a Roadster HPWC. I am learning that there are 2 models. The first appears to be indoor rated only with 70amps max. The currently sold model is indoor/outdoor and also has a 70amp max. Please correct me if I am incorrect here. I am also trying to learn more here. Is the original one a valid/safe option? I do not need to have a need to install outdoors. Overall, I want to charge up to 70amps.