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I have a closed loop system using two 25 evac tube system with a 80 gallon storage tank. The system is filled with glycol. I've always been concerned as to what would happen in case we had a power outage. I decided to hook up my controller to a battery back-up system which is also used to supply power to my pellet stove in an emergency. It happened today. We lost power for over an hour and the sun was just as bright. If I hadn't been connected to the back-up, I know tha the glycol would have boiled and would have venedt out to the atmosphere. I have a pressure regulating valve but it would have been useless because my well pump would not have worked. My question is could there have been any permanent damage caused by an outage if I didn't have the back-up? Thanks for any input.