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Old 02-28-2014, 01:43 AM   #1
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Question Generator Undersized

I have done some research on Cummins/Onan generators, the 5.5kw and 7kw have the same size engine, but operate at different rpm's. My unit has 3 A/C's that can't be powered at same time by the 5.5KW but could possibly, with the 7KW
Has anyone learned the secret to converting there 5.5kw to the 7kw?
Look at the engine CC size and then look at the carb part# identical they operate at 2400 the 5.5kw and 2880 RPM for the 7kw and both make their power at 60Khz......Am I missing something, if I raise the rpm's on my 5.5kw then the Khz goes to high also.....
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Old 02-28-2014, 01:44 AM   #2
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Old 02-28-2014, 01:52 AM   #3
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Old 02-28-2014, 02:01 AM   #4
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Onan says the 7kw has an amp output of 58.3 amps while the 5.5kw has a 45.8 amp output. Their website says the 7kw will power 2 a/c but doesn't mention 3: "Runs one or two air conditioners with power to spare".
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Old 02-28-2014, 02:04 AM   #5
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Reworded original, but just do not understand this phenomenon to me!
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Old 02-28-2014, 02:10 AM   #6
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If my camper was closer, I would walk back and see what size breakers for my A/C units, just guessing 15A, So X 3=45A so if true the 7kw should work.
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Old 02-28-2014, 03:57 AM   #7
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AC units need 20 amps to start. Generator output listings are for maximum startup loads, not running loads.

Just because the motors are the same size doesn't mean the generators are. The motor just drives the generator.
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Old 02-28-2014, 10:00 AM   #8
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The engine size may be the same, but I would bet that the generator unit is completely different. The windings are probably bigger and that is how it runs at a higher RPM while still making 60HZ. I would bet that you can't make a 5.5 generate 7KW. (but I am no expert, just a mechanic)
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Old 03-01-2014, 02:03 AM   #9
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True, never thought about the windings side all good points. Off subject but here it is 9pm been home since 5pm and still not ready to pull out for camping in the morning...checking air pressures, shot of grease in the hubs, hooking up to the truck, loading clothes and loading up the groceries, was going to load the toys, but exhausted from working/fighting traffic so gave up to finish bright and early or really whenever I wake up! Getting a little too old for the weekend warrior camping!
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Old 03-01-2014, 02:16 AM   #10
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Quote:
Originally Posted by lakebuster View Post
so gave up to finish bright and early or really whenever I wake up!
That sounds just like me! More off subject. Have you hit the CAT scales yet. Just wondering.
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