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07-02-2018, 10:29 PM
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#1
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Senior Member
Brand: Thor Motor Coach
Model: Challenger 37TB
State: Pennsylvania
Posts: 412
THOR #4486
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Question about the 5500 Onan Gen
Tried running both AC units while Onan 5500 gen running but only one AC unit would operate although both were on and set to a temp lower then the room temp. Is this normal as I was under the impression that a 5500 gen could run both AC units simultaneously.
__________________
Tom and Lisa
Pennsylvania
2015 Challenger 37TB
2015 Ford Taurus toad
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07-02-2018, 10:43 PM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 35C
State: South Dakota
Posts: 1,132
THOR #3761
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How many amps is your service? If 30 amp, you may be limited to one AC unit (along with any other power draws.) 50 amps should run both.
__________________
John
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
Blog - https://traversity.us
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07-02-2018, 11:01 PM
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#3
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Senior Member
Brand: Thor Motor Coach
Model: Challenger 37TB
State: Pennsylvania
Posts: 412
THOR #4486
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According to a power calculator, the 5500 watt gen has enough amps to run both AC's. I read in another forum to check the gen to make sure both breakers are on as one might have tripped. I will do that and provide an update.
__________________
Tom and Lisa
Pennsylvania
2015 Challenger 37TB
2015 Ford Taurus toad
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07-02-2018, 11:21 PM
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#4
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 4,157
THOR #6411
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Quote:
Originally Posted by schreinertms
Tried running both AC units while Onan 5500 gen running but only one AC unit would operate although both were on and set to a temp lower then the room temp. Is this normal as I was under the impression that a 5500 gen could run both AC units simultaneously.
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You only have about 20 amps left over with the A/Cs running. Frig and converter take up most of the spare (both on L1). Turn on the microwave or the electric water heater and something will pop. You have 30 amps on L1 and 20 amps L2 usable. An EMS helps with this problem.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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07-02-2018, 11:22 PM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 35C
State: South Dakota
Posts: 1,132
THOR #3761
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I just saw that you have a Challenger 37TB so you should have 50 amp power. The next thing to do is what you said - check the breakers on the generator. That has happened to us before when one leg of the power went out.
__________________
John
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
Blog - https://traversity.us
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07-02-2018, 11:44 PM
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#6
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Senior Member
Brand: Thor Motor Coach
Model: Challenger 37KT
State: Michigan
Posts: 282
THOR #2628
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Checked all breakers, all were on, I was driving so just the AC's and Fridge were on.
KC
__________________
2015 Challenger 37KT
Progressive Industry EMS-HW50C, Winegard Trav'ler Sat dish, Magnashades, 5 star tuner, lots of indirect lighting.
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07-03-2018, 12:52 AM
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#7
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Member
Brand: Thor Motor Coach
Model: ACE 32.1
State: Michigan
Posts: 85
THOR #11442
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My ACE 32.1 has the Onan 5500 and I can run both A/C's at the same time. Try operating the one that didn't work just by itself. It may be a blown thermostat fuse.
Sent from my SM-N910V using Thor RV Forum mobile app
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07-03-2018, 11:44 AM
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#8
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Senior Member
Brand: Thor Motor Coach
Model: THOR Chateua 35SF
State: Florida
Posts: 5,850
THOR #11130
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It will run both, period. Check the thermostat button thingy sensor under one of your cabinets in the area of the a/c that doesn't run. You may have a bad sensor. Either way, sounds like the problem is in the power to the a/c...not a generator issue. Test incoming power to a/c unit. Do both of them work when connected to shore power?
__________________
Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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07-03-2018, 09:47 PM
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#9
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Senior Member
Brand: Thor Motor Coach
Model: Challenger 37TB
State: Pennsylvania
Posts: 412
THOR #4486
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Both units run on shore power just not on Gen power. Checked the two 30 Amp breakers on the gen and neither was tripped.
__________________
Tom and Lisa
Pennsylvania
2015 Challenger 37TB
2015 Ford Taurus toad
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07-03-2018, 10:10 PM
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#10
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Senior Member
Brand: Thor Motor Coach
Model: 2017 Windsport 29M
State: Indiana
Posts: 3,692
THOR #5196
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Quote:
Originally Posted by schreinertms
Both units run on shore power just not on Gen power. Checked the two 30 Amp breakers on the gen and neither was tripped.
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The breakers might be tripped but not appear to be. Physically turn breakers off and back on. Also check your “house” breakers, especially the AC, flip off and back on again. Will both AC’s run when plugged in to 50 amps? Is it only the front or the back that won’t run, if it is a specific AC you may want to check the connections at your transfer switch. Just a couple of things you may want to try. Things like this are very frustrating!!!
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07-05-2018, 06:59 PM
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#11
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Senior Member
Brand: Thor Motor Coach
Model: Challenger 37TB
State: Pennsylvania
Posts: 412
THOR #4486
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Reset all relative breakers, tested and both AC's now are able to run simultaneously with the gen running, no shore power. Thanks for all the feedback.
__________________
Tom and Lisa
Pennsylvania
2015 Challenger 37TB
2015 Ford Taurus toad
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