Our previous camper was a 30 Amp service andit had no problem running the AC and WH simultaneously. The AC was a 13500 unit. Perhaps a 15000 unit may have had problems.
The only things I could not run with the AC WH was the Microwave and/or my wifes hair dryer. Like a previous poster I ran a 20 Amp line but I put it into a receptacle beside the lavatory. That was for DWs hair dryer. It worked perfectly.
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2012 Wildcat Sterling 32RL, Gladiator Qr35 ST235/85R16 Load rating G, TST 507 TPMS w/ Flow-thru Sensors & Repeater, Reese Sidewinder 16K Pin Box, PI EMS HW50C
2009 Chevy Silverado 2500HD CCSB LTZ Diesel, Fumoto Oil Drain Valve, Turbo Brake activated, 39 gal Aux Tank W/ Fuel Pump transfer, Air Lift Loadlifter 5000 air bags.
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