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Your inverter only powers the reefer when it is turned on and you aren't on SP. Your batter(s) supply 12 volts to the inverter which ups it to 120 volt to run reefer. When the batteries drop below a certain level no more power to reefer. Mine has run on inverter/batteries (2 Group 27 wet cells) for 13 hours without quitting but very little else was being fed by batteries.
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2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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