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Old 10-28-2018, 07:18 PM   #31
whutfles
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Join Date: Apr 2015
Location: Omaha
Posts: 256
M.O.C. #17319
A few years ago in Texas temp got down to 24 and the power went out during the morning after 8AM. The furnace came on and ran for about 15 mins. Was off for about 30 mins then furnace came on again for another 15 mins. I watched the battery gage go down. After the 3rd 15 min cycle the battery got down to 1/3rd. I plugged into truck and ran it for about 25 mins to fully charge the 2-12 volt batteries the dealer had installed. After 3 more cyclings of the furnace had to recharge again. I think the power was off about 3-4 hours then came back on. I now have bigger batteries so might be able to go a little longer before charging. I think we had the thermostt set to around 71 degrees so if I had it down around 50-55 degrees the furnace wouldn't have cycled on as often.
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