I'd hesitate before buying a propane gas detector that runs on AC. Often, these detectors require about 1 W or more of power for the sensor to operate correctly - which is why they are typically connected to either AC or a 12 V source. The battery backup probably won't allow the device to run much more than a few hours and if you're not connected to AC or there's an AC failure, you may not have protection.
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Al, K6IV
2015 30' Classic, "Chez Nu"
2014 RAM 2500 w/Cummins Diesel
ProPride Hitch, 400 W Solar
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