Thanks ed, I appreciate the insight with the cold. I'm in embarrass which is often the coldest spot in Mn. The night Tower broke the official MN record low at -60, the official Embarrass thermometer broke at -64. I'm starting to wonder if solar panels are the right option for the amount of time I spend at my cabin and the time of year I use it. I can run my generator to charge the batteries for less than $5 per day. I stay at my cabin about 40 days per year. That's only $200 per year with no up front costs and no risk of damaging anything due to the cold. It would be next years project so I'll keep studying the benefits.