In a reasonable budget the answer is easy. Gather pop bottles wash them out and if the power fails use the last of the hot water to fill the bottles to 94º this will cool down but it should buy you a number of hours. Cover the enclosures with blankets (if you have che or lamps turn them off before you cover things... It will not do to burn the place down when it comes back on...)
These should help if it is a few hours long term I hope you have a camp stove and can heat more water. A catalytic heater will also work but they may or may not be an off the shelf item.
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I have been playing with a battery back up system if I may ask can you describe it?
I was looking at 4 deep cycle batteries with an auto switching inverter (transfer switch) to run a on/off t-stat set to 80ºF and a lenght of heat cable. The cost stopped me. I would be interested in hearing what you have done.








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