It is common with the Prevost conversions, I had a Marathon that would run 1 cruiseair 4 hrs or 2 cruiseairs for 2 hrs. The inverters were 4K and the battery bank was 6 Lifeline 4D's. There were stories of some running 2 cruiseairs while driving many hours and the 270 amp DC alternator couldn't keep up and it would run down the house batteries. Like Tuga said, run the gen, they're good for 30,000 hrs according to Powertec.
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