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Old 06-11-2017, 10:51 AM   #21
Bus Nut
 
Join Date: Jun 2013
Location: Picton,Ont, Can.
Posts: 776
Year: 1997
Coachwork: Bluebird
Chassis: GMC
Engine: Cat 3116
Rated Cap: 72
Just a thought when the ac starts... what settings do you have it on? try low cool and low fan to see if any difference. Let it run like that and avoid opening the doors, windows etc as little as possible. Tests like this take a bit of time to check out both the ac and the genny. I'm really thinking the genny is undersized at this point.

746 watts is 1hp
At 110v and 15amps you should be drawing 1650 watts continuously, or about 2.3 hp.
The genny maxed out at 3000watts or 2800 watts continuously or 3.75hp which should be enough for that ac unit when nothing else is running, like the inverter charger combo. Yet it won't run but will run on the 4kw genny.
I can't see any other solution from here without clamp-on ammeter readings. They are a tool that will pay for itself many times over so, think about buying one or have an electrician verify what's going on.

You may get by running it on the lowest settings but not when ih high heat/humidity with your setup. And that just plain doesn't cut it does it?

John
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Old 06-11-2017, 03:11 PM   #22
Mini-Skoolie
 
Join Date: Jun 2016
Location: Bellbrook OH
Posts: 49
Year: 2000
Coachwork: Bluebird
Chassis: International
Engine: DT466E
Your right. Today won't cut it with the A/C on low. When I turn on the A/C, I turn on the fan only first. That runs OK. As soon as I turn it to the lowest cool position, it kicks off. If the generator is too small, do you think a 3400 would do the job? The issue I'm having is the larger generators are much bigger and louder. Unless you want to put out the big bucks for an Onan. Again bigger and not portable. I like the size and noise level (58 db) of this Champion. They have a 3400 version that is basically the same size and noise level as the 3100. But if it doesn't work, it doesn't really matter. Any suggestions are appreciated. Thanks again.
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Old 06-11-2017, 03:24 PM   #23
Bus Crazy
 
Join Date: Mar 2011
Location: Oregon/Philippines
Posts: 1,660
fwiw.. i just hooked up my 44 line rated amps 220v to an size 12 extension cord, and it started and ran... so your wire size of 8 for sure is OK. In my last two conversions, I purchased used Onan generators for cheap out of motorhomes, and then purchased automatic switch over breaker boxes to hook to the shore power. Have had no problems with either of those. As for the generators, I used auto fuel tanks with fused electric fuel pump in the lower compartments.
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Old 06-11-2017, 06:24 PM   #24
Bus Nut
 
Join Date: Jun 2013
Location: Picton,Ont, Can.
Posts: 776
Year: 1997
Coachwork: Bluebird
Chassis: GMC
Engine: Cat 3116
Rated Cap: 72
Ok, I am questioning your method today. The fan starts first on low.
The lo cool position must be already selected,not after the fan starts or the ac starts at higher amperage which trips the system. Am I right thinking you switched to lo cool from a higher setting with the fan running.

For another test, connect the ac feed in the panel to the 30 amp breaker that runs the battery charger and try the same method as above. That eliminates the 20 amp breaker for now, which might just allow the unit to start and run. Worth a try.

Next - how and where is the genny mounted, is it permanent? I know you like that genny for your reasons but I cannot see it being of big enough capacity as the load increases, so you have to make a choice I think.
Not sure what loads you might have in future but if changing to the 30 amp breaker won't let it run correctly then it has to go if you want any other power. The present genny should run it all by itself no problem.

I have a 2500 watt genny out back of the bus that runs 2 ac units for a total of 18000 btu and a small fridge, an electric water heater and other outlets for comparison sake. Mind you they won't run all at the same time ever so I can get by just fine till I get my 6.5KW Onan mounted. I have a 4kw Onan in my motorhome that runs everything just fine with an ac unit eqivalent to yours.

So, try changing the wiring for the ac to the 30amp breaker and lo settings on fan and compressor to start. If the bigger breaker lets it start then you can up the settings till you find out what it is capable of.

If that doesn't work, go for the soft start capacitor as mentioned back in post #3 I believe.

Even if you get it running I don't think that genny is of sufficient size to be totally comfortable and reliable. Up the size to about 5-6 KW if you buy another, not the 3400 you mentioned.

Hope to hear how this works out. I'm out of suggestions I think for now.

John
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Old 06-11-2017, 07:48 PM   #25
Mini-Skoolie
 
Join Date: Jun 2015
Posts: 35
That's because u need 30 amp


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Old 06-11-2017, 07:49 PM   #26
Mini-Skoolie
 
Join Date: Jun 2015
Posts: 35
Needs 30 amp breaker it's not the plug on the cord besides those champion generators are junk that's why there so cheap


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Old 06-12-2017, 12:53 PM   #27
Bus Crazy
 
Join Date: May 2016
Location: Pacific North Wet
Posts: 1,739
Year: 2002
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Chassis: All American RE (A3RE)
Engine: Cummins ISC (8.3)
Rated Cap: 72
MANY people are using the Champion 3100 with very good success on their RV and running a single roof air. Check out the discussions on I2rv and RV.net.

If I had to choose between the Honda and Champion, regardless of cost, I would pick the Honda. If the $ are coming out of my pocket I would be looking at the Champion.

Seriously, if you plug in to shore power and the AC runs but when plugged into the generator it will not start the compressor I would be looking more at the AC.

The soft start kits are cheap. I will bet that $20 and 20 minutes of your time would have that AC running from your Champion generator.
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Old 06-12-2017, 01:33 PM   #28
Mini-Skoolie
 
Join Date: Jun 2015
Posts: 35
I got a 4000 Onan BFA love it 2 nd one in 18 years


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Old 06-12-2017, 01:34 PM   #29
Mini-Skoolie
 
Join Date: Jun 2015
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Old one after 78000 hrs


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Old 06-12-2017, 01:47 PM   #30
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Location: Willamina, Oregon
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Coachwork: 97 Bluebird TC1000 5.9
Didn't I see that geny on Craigslist?
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