Coast Resorts Open Roads Forum: Class A Motorhomes: Doris is Dead!


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Groover

Pulaski, TN

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Joined: 10/17/2007

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Posted: 09/18/23 07:24am

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CA Traveler wrote:

So glad for all of you. But please note that running 2 A/Cs on 30A can be questionable. Why? The NEC recommends a max of 80% to limit the heat or 24A for sustained operation and 2 AC's are sustained operation. And your family member issue likely contributed. But your dedication is fantastic and I admire you guys! Thanks for sharing.

You can run both AC's on 30A IF all other power draws are shut down with the exception some LED lights and a radio or TV. It really helps if you have soft starters on both of the AC units. Start with the batteries fully charged so that you are only doing maintenance charging and make sure that the water heater is not running on electricity.

My coach has both AC's and the water heater are on the same circuit but just about everything else is on a different circuit. I did have to put in a soft start system for one AC and plan to do the second one soon. It hasn't been a problem when on shore power. I have to watch it when on the 6kw generator. The starting load on an AC can hit 30amps all by itself. It is very short duration with the running load dropping down to about 11amps. The generator doesn't have as much in reserve as shore power does and starting both at the same time will trip its breaker without a soft start.