What Size Generator Do I Need to Run a 15,000 BTU RV Air Conditioner?
A larger roof air conditioner needs a higher start. This page is only that question.
Full breakdown: RV generator sizing.
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Running and starting watts
| Load | Running watts | Starting watts | Source |
|---|---|---|---|
| RV AC, 15,000 BTU | 2,000 | 3,300 | Honda |
| RV AC, 15k BTU | 2,000–2,500 | 3,500–4,500 | Champion |
Honda's wattage guide lists starting watts, then running watts. Champion's chart lists running watts, then starting watts. This table puts every figure in the Running and Starting columns. Not listed means that source does not give a separate starting figure.
How to size it
Add the running watts of every load that will be on together, then add the single highest starting surge (Generac; Honda). Generac notes that starting watts are often 2–3 times running watts, and that standby units should get a dealer survey.
A single EU2200i is rated 1,800 W with a 2,200 W maximum, which is below both the 2,000 W running figure and the 3,300 W start. The smaller 13,500 BTU roof air conditioner is a separate page.
Check a full load list on the generator size calculator.
Run the generator outdoors only, 20 ft from the house (CPSC).
FAQ
Can parallel EU2200i generators run a 15,000 BTU RV AC?
They reach up to 4,400 W. Champion's upper start is 4,500 W, so the parallel figure is short of the chart that covers both sources.
What does Honda list for this air conditioner?
2,000 running watts and 3,300 starting watts.
What does Champion list?
2,000–2,500 running watts and 3,500–4,500 starting watts for a 15k BTU RV air conditioner.
Which published generator rating covers both?
The Champion manual lists 5,000 W running and 6,250 W starting, which is above 2,500 W running and 4,500 W starting.
Related questions
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