My coach came with a 15k unit and I added an 11k unit to the bedroom. Both run on 4K gen set as long as frig, micro, water heater are off or on gas. The 11k is a "power saver" model, costs a little more but draws less amps. They may have a 15k power saver model, not sure.
If a 4k generator will push a total of 26K BTU air conditioning, I would think a 5.5K would push 30K BTU.
Don't know if it matters, but I installed hard start kits to both units.
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1998 Min Winnie, 2000 Winbago Journey, 2015 ACE 29.3
2016 Thor Miramar 34.2
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