Sorry if this has been asked before tried to do a search and was not to successful. I'm looking for a good solar battery maintainer any suggestions, I live in southern Ontario so kind of limits the options. I've checked on Amazon.ca and there was one for about $60 bucks but said it's operating range was 0-60 degrees so not good for the winter. Have seen the ones that you mount to the vehicle and plug in to a a/c outlet but was hoping for a solar one. Any ideas ?