I wanted a one item solution and I am not thinking that freezing will be a big issue in Portland, Oregon area. I want to use this ( https://smile.amazon.com/DALY-LiFePO4-Battery-managment-Discharge/dp/B087BXR4TZ/ref=sr_1_1?dchild=1&keywords=8s+daly+bms&qid=1590030056&sr=8-1 ) will I need a...