If you do, I just finished a project that you might be interested in. If you worry about power outages, this is the ticket....It is Auto-Switching and auto charges when power is restored. Batteries are 6v 242ah batteries for a capacity of 484ah @ 12v...This setup doesn't break the bank and gives me about 7 hours run time on my furnace down to about 50% capacity left in the batteries. I've heated my home with a wood furnace for over 20 years and have always been concerned with a power outage after going to work. Not any more! This thing is sweet! I ran it on backup for 4 hours today. The batteries only dropped .1v in 4 hours and never even got warm to the touch.