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Old 08-28-2014, 10:01 PM   #1
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Generator

We are totally new to motorhomes. Just bought a 2014 georgetown XL 378TS. First trip put, I ran the generator, Onan 5.5, with both airs and the house type refrigerator. Found out later the electric water was also on. When I got to my campsite the generator was still running but none of the items I turned on were running. The breakers on the gen weren't tripped. Was it just overloaded? The dealer says the generator will run everything in the coach at once but I find that a little hard to believe. What's the truth from those of you who are experienced?
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Old 08-28-2014, 10:21 PM   #2
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It will not run everything, I just pulled my Rv out of storage today, fired up generator, turned on both a\c units to cool it down, usually turn off the back unit before I leave out and about 20 minutes down the road, transfer switch kicks out and everything goes off. I shut everything off and let the transfer switch kick back in and then turn front a\c back on. If you run the fridge on propane and the water heater on propane that will help, but in the heat of the day, it's hard for to run both a\c units on the generator! I have tried and tried to have this fixed and am just gonna have to live with the fact that this is the way it is.......


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Old 08-28-2014, 10:26 PM   #3
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in motion, i have had issues running both AC's in high heat situations. but parked, i have had no issues. i think it is a heat and in motion thing more than a power thing. i think the genset does not cool itself as efficiently while in motion.

anyone else have a theory ?
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Old 08-29-2014, 08:25 AM   #4
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You will only be able to run one AC unit safely with 5.5 kw. That is why 7kw generator is an option so that you can run both
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Old 08-29-2014, 02:11 PM   #5
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Originally Posted by willingtonpaul View Post
in motion, i have had issues running both AC's in high heat situations. but parked, i have had no issues. i think it is a heat and in motion thing more than a power thing. i think the genset does not cool itself as efficiently while in motion.

anyone else have a theory ?
Was looking at an Onan spec sheet and if I understood correctly it noted a 1% drop in the generator output for every 10 above 77F and a 3.5% decrease for every 1000 ft above 500 ft sea level.
I can run both AC's and residential fridge without any problems. Maybe it's because I'm on the coast at sea level? Maybe I'm just lucky and tomorrow it won't do it anymore.
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Old 08-29-2014, 02:25 PM   #6
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Haven't had any problem with running both AC units on the generator when parked with the fridge on also {ours is not a full size residential fridge}, water heater on propane. If we use the microwave I have to turn off the front AC for a little while. When driving I use the front AC and just run the fan on the back unit. There's usually no one back there and just run it so the back doesn't get like an oven. Both units share the same ductwork so it works fine that way for us.
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Old 08-29-2014, 06:57 PM   #7
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Thx, everybody. I thought "everything" was a little much for a 5.5 kW. I'm sure I'll be pestering y'all with some more dumb questions soon. We're taking it out again next weekend.
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Old 08-29-2014, 07:33 PM   #8
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Thx, everybody. I thought "everything" was a little much for a 5.5 kW. I'm sure I'll be pestering y'all with some more dumb questions soon. We're taking it out again next weekend.
I think I'd be checking Generator "condition" not "capacity". 5000 watts is more than sufficient to operate two a/c units of 13 amps each at full load. The res refridge is 7 amps while drawing full current less than 20% of time. Fuel filter, governor or some other mech fault is to blame. The folks that do it with no problem aren't just lucky.
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Old 08-29-2014, 08:54 PM   #9
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generator

We just took a 10 day trip from NY to Disney and ran both a/c's and occasionally the micro while in motion(fridge on propane) the entire way there and back in 98+ heat and had no issues at all. Lucky
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Old 08-29-2014, 09:29 PM   #10
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Is it possible that with everything on and both air conditioners happen to start at the same time the genny could be tasked at the ragged edge of maximum output (single phase at 45.8A) and temp exceeding 120deg "F"?
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