I have been meaning to post this prior to the Fall, but better late than never. I will try to post pics later of my basic solar system. I have a 1 story home with the original solar panels on the roof (not sure which previous owner installed them). We live in in Alameda County, which is the East Bay of San Francisco. Per the average winter temps, temps could dip to the high 30s, but I assume this would be a rare occurence, and for not too long. Basically, I am curious if I need to drain my solar panels? I don't see any drain valves or ways to drain my system. Hopefully, you all will be able to help after I get some pics uploaded.