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Old 07-16-2015, 03:55 PM   #1
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Generator Output Test?

I have Champion 3500-4000 watt Gen. it will not power my TT A/C.
the A/C on my load tester shows 540 watt draw when hooked to shore
power. the Gen. should have way more than enough power, any ideas?

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Old 07-16-2015, 04:43 PM   #2
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What size is your AC? We've a Harbor Freight 3200/4000 generator that'll power our 15k btu one fine.

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Old 07-16-2015, 05:34 PM   #3
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Is the Champion Generator a real AC Generator or an Inverter generator like the Honda?

If the former it could be shutting down because the starting current is higher than it's safety sensors can tolerate. If the latter it should big down but keep running as the AC motor spins up.
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Old 07-16-2015, 06:03 PM   #4
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If it is an inverter generator, and if you have it in economy mode, the AC starting current might be too much for it.

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Old 07-16-2015, 06:18 PM   #5
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A true load test on a generator requires a special electrical load bank that is usually not available to a DIYer. Any reputable generator repair shop, or service centre should have the appropriate tools and able to load test your generator for a fee.

Some 15K BTU/hr air conditioner have a large in-rush current as mentioned. I installed a Supco SPP6E boost capacitor on a previous trailer. Here is a link to a mod page, and a .

Hope this helps,
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Old 07-16-2015, 06:32 PM   #6
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Originally Posted by kekker View Post
I have Champion 3500-4000 watt Gen. it will not power my TT A/C.
the A/C on my load tester shows 540 watt draw when hooked to shore
power. the Gen. should have way more than enough power, any ideas?

A 15000btu Air Conditioner draws 14amps running and 20+ surge when the compressor starts. That is 1680 watts running. Given that, your 540 measurement is incorrect.

I looked up that model generator and its 30amp twist-lock outlet is protected by a 25amp circuit breaker. With that said, your air conditioner and anything else running such as your Converter in your trailer will overload that specific generator.

Often the advertised ratings of generators are a stretch of the truth. In fact in that specific case, the continuous rating is 2850 watts not 3000 or 4000.

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Old 07-16-2015, 08:54 PM   #7
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I had the same Champion Gen. on the back of my Excel 5th wheel it ran the 15000 A/C just fine. Ran lights, T.V., A/C, water pump, all at the same time no problem. Great generator for the $$ IMHO

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