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Old 09-11-2016, 03:12 PM   #1
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Dual air conditioner and Generator

Hello everybody,
I have a 2008 Winnebago Journey, The problem that I have is what I am not sure of.
My situation is I have my motorhome hooked up at my house on a 50 amp breaker no problem, I can turn on and off the air conditioner while its hooked up.
I disconnect the electrical cord from my home 50 amp outlet.
Then I turn on my generator from my RV and the air conditioner will not come on after 10-15 minutes.

Can someone please help?

Thank you!!
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Old 09-11-2016, 03:19 PM   #2
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Have you checked the circuit breaker on the generator to see if it has been tripped or not?

Does anything else in the RV work when the generator is running?

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Old 09-11-2016, 03:22 PM   #3
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garzaes do you have AC power on both legs in the rest of the coach? Does the fan on the AC unit come on? There is a long delay after a power interruption before the compressor will come on.
If you don,t have any ac power in the coach the transfer switch is bad or the breakers on the generator at tripped.
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Old 09-11-2016, 03:47 PM   #4
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Thanks for that response,
yes everything else inside works. I had forgotten all about the circuit breaker on the generator. I will go now and check.
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Old 09-11-2016, 03:50 PM   #5
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Thanks for your response!
I do have power on the rest of the coach. I am going to check the generators circuit breaker.
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Old 09-11-2016, 06:12 PM   #6
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The circuit breaker was tripped on the generator, I switched it back to on. I turned on the generator then turned the air conditioner to the on position, after about 30 minutes or more the air conditioner still would not come on.
But the air conditioner still comes on with the motorhome power cord plugged in to my 50 amp box.
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Old 09-11-2016, 06:27 PM   #7
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Your electrical system should be exactly the same as my 2008 Meridian.

Try this: Make sure that your inverter is switched off. With the shore power connected and the A/C unit working, what indication do you get on the EMS readout?

Now disconnect shore power and start the genny. What indication is on the EMS and does the microwave work?

I am trying to keep the steps simple at this point, in order to focus the diagnosis.
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Old 09-11-2016, 06:28 PM   #8
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i'll try to help but need more info.

what type of a/c?
what type of generator?
you say you have a/c power to everything else. when plugged into shore power? when disconnected and running the a/c?
is this a portable generator or hardwired? if portable how do you connect the rv to the generator? are you getting power from the generator to both sides of the 50 amp circuit? are you able to take a meter and confirm that you have 110 volts ac on both legs at the circuit breaker box?
any idea why the generator circuit breaker tripped? did you check it to see if it tripped again after resetting it and waiting the 30 minutes for the a/c?
is the a/c circuit breaker internal to the rv tripped? (not the one on the generator).
if you have the generator going are you able to turn on the a/c fan (not the compressor)? you should not have to wait very long (seconds) for this to come on?
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Old 09-11-2016, 07:12 PM   #9
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bluepill,

I'm not sure which one is the inverter box, there is an inverter box beside the motorhome power cord it appears to have like a small circular fan cage type. If that is the one I did not see any switch.
I posted a pic of what I think is the inverter, see if you can open it.
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Old 09-11-2016, 07:34 PM   #10
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I did not see a link for the photo on the post.

The Inverter/charger control panel should be with all the other electrical controls - probably in your hallway next to the bathroom door if you have a 37H floorplan.

Looks somewhat like this:



This is a newer style panel than supplied in 2008, but has the same basic features.

Press the "Inverter power" switch to toggle to "OFF".

The LCD display should then indicate inverter off.



Now for the EMS display. This is what you should have displayed when on shore power:



Note that the "AC LINE AMPS" loadmeter display is NOT lit. That is normal when 50 amps shore power is being supplied.

30 seconds after starting the generator, the "Gen Set" light should come on and the loadmeter display should come on. Also, all four "Power Status" lights should come on.

Your microwave should now work normally. That is a sign that the power circuits from the generator are working correctly. If the A/C still does not function, the fault is with the A/C circuit or thermostat.

There is a fault indicator light on the A/C circuit board that can be seen by opening the outside A/C cover panel and removing the cover on the electrical box. The box cover has a diagram and chart inside it.
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Old 09-11-2016, 07:39 PM   #11
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Bigchick,
Name of the Air conditioner is True Air Residential Central heating and air conditioning.
Name of the generator is Onan Quiet Diesel 8000.
I have a 2008 40ft Winnebago Journey motorhome, the generator came with the motorhome.
With the generator on the AC does not come on after about 30 minutes or so nor does the fan come on.
With the generator off and the shore power connected to my home 50amp the AC will work.
Thanks
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Old 09-11-2016, 08:16 PM   #12
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Bluepill,
Thanks for trying to help me out!
I did find the panel where the inverter read out is at.
The EMS readout is showing 50 amps is lighted and also lighted is the
.water heater
.A/C comp #2
.Fan speed
.Refrigerator

Okay the microwave does work.

The inverter readout says
.CHGR-COND MODE
14.8VOLT, 5AMP
I pressed the inverter button then it displayed this.
. CHGR-OFF AC BAD
INVERTER-OFF
Was I not supposed to press the inverter button again?
Thanks
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Old 09-11-2016, 08:38 PM   #13
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If the display says inverter off, that should be what you want to test the system.

BTW, is this your style of display:



Now switch to generator and see if the micro works and the EMS display is as indicated in my last post.


I have PDF copies of manuals for the generator, EMS, and inverter/charger if you need them.
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Old 09-12-2016, 08:07 AM   #14
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it works on shore power so the circuit breaker in the distribution panel is ok. certainly the generator is large enough to supply adequate power. my thoughts are that one of the power legs between the generator and the power panel has a problem. either a 2nd circuit breaker on the generator or a faulty transfer switch that is not switching both legs. sure would be nice to get voltage readings on the generator leads into the transfer switch and voltage readings on the output leads from the transfer switch while on generator. these should be the same as the power leads into the distribution panel.
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