#1-You don't need a 50 amp service to your unit to keep the batteries charged up (a normal 15 amp will be fine) get a 50 to 15 amp adapter so you do not have to get the anaconda cord out. 50 amp would only be needed if you were going to use it in place (running the a/c etc.)
#2- as long as you keep an eye on the battery water levels, leaving it plugged in 24?7 will keep the batteries charged and will not over charge them (should have a smart charger)
#3 All though I have never owned a camper with a residential fridge, I would assume that when plugged into shore power it only uses 120 volt a/c power. Make sure any inverters are turned off.
Hope this helps you out.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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