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Generator bogging when A/C is turned on

randybobandy
Explorer
Explorer
We like to camp on the beach in Port Aransas and have used our Champion 4500 generator with two previous small RVs, AC unit ran fine. Got a Gulfstream Vintage Cruiser 19R and it also has a single 13,500 BTU AC (same as our previous ones) but when the AC is turned on, it bogs down real slow and eventually shuts the generator down. Only had the generator 3 years but I changed the brushes and voltage regulator anyway, same result. This rooftop AC appears to have a heating mode as well but have never used it. I have made sure the electric water heater nor any other heavy draw components were on. Does anyone out there have suggestions?
10 REPLIES 10

jimh406
Explorer III
Explorer III
I agree a 4500 W generator should run everything with a single AC. I agree it's more likely the fuel for the generator or air. I'd change the air filter if you haven't, fuel filter, and clean the carburetor with carburetor cleaner.

'10 Ford F-450, 6.4, 4.30, 4x4, 14,500 GVWR, '06 Host Rainer 950 DS, Torklift Talon tiedowns, Glow Steps, and Fastguns. Bilstein 4600s, Firestone Bags, Toyo M655 Gs, Curt front hitch, Energy Suspension bump stops.

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RLS7201
Explorer
Explorer
What you describe, I believe is a lean run issue. I.E. carb or fuel filter.

Richard
95 Bounder 32H F53 460
2013 CRV Toad
2 Segways in Toad
First brake job
1941 Hudson

LouLawrence
Explorer
Explorer
With a 4500W generator you are going to have around 35 amps available for the coach. The A/C should only be drawing around 12-14 amps except at startup and that only lasts a few seconds. I would go with the first step of shutting off all 120V breakers and seeing what happens when you turn only the A/C breaker on. Let us know what you find.

MrWizard
Moderator
Moderator
Is this fresh gas?
Stale fuel can do this..
It's also possible the A/C unit needs a new start/tun capacitor, this is a low vost part and easy to replace, try running just the Fan Mode , what happens, how does it sound,
3 things in the a/c can cause this problem, bad capacitor, bad compressor, bad fan motor.
8
I can explain it to you.
But I Can Not understand it for you !

....

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valhalla360
Nomad
Nomad
Something is wrong. We have the same generator and it has no issue getting the air/con going. In fact when we bought it, I was testing and ran a 1500w space heater while starting the air/con.

One test would be to kill all the breakers except the air/con. That way, you know nothing else is drawing 120v AC.
- If it starts fine, you had something else drawing a lot of power.
- If it still struggles, it's either the air/con or the generator.

You might try starting a friends air/con with your generator.
- If it starts fine, the problem is likely in your RV.
- If it struggles, the problem is likely in the generator.
Tammy & Mike
Ford F250 V10
2021 Gray Wolf
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katysdad
Explorer
Explorer
Does the AC work on shore power?
Dodge Ram 3500 DRW Diesel

CA_Traveler
Explorer III
Explorer III
NOW you can track down the problem which can be the gen, A/C, wiring or other appliances. Observe all safety precautions or get help.
2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
750 Watts Solar Morningstar MPPT 60 Controller
2014 Grand Cherokee Overland

Bob

CA_Traveler
Explorer III
Explorer III
Buy this Clampon Meter and measure the amps.

Never leave home without it and you'll be a happy camper.

Your A/C should draw about 15A and it's input voltage should be 108V+ when running.
2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
750 Watts Solar Morningstar MPPT 60 Controller
2014 Grand Cherokee Overland

Bob

haste_maker
Explorer II
Explorer II
You may have to use a larger cord from the camper to the generator than in the past.
Retried Teamster
2007 Allergo

QCMan
Nomad II
Nomad II
Is it possible more is on the 110 feed than you think? If the reefer is a two way it will default to electric and if the water heater electric is on you now have three items getting fed by your generator along with the converter making 12 volts to power lights and other items like propane and CO detectors and other items.
This may add up to more than your generator is comfortable with.
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