Generator Will Not Run AC

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Bob Rivers

New member
Joined
May 12, 2019
Posts
3
Location
Louisa, VA
2003 36LD Horizon,
New basement AC unit (2 compressors), Same issue with old AC unit.
Well maintained Onan Diesel Generator
AC runs without issue on shore power.

Problem:  Generator turns off when AC is running.  It does not rev up or bog down under the load, it simply turns off.  The generator will restart immediately, run for a few minutes then shut down again.  Any suggestions?
 

Isaac-1

Well-known member
Joined
Dec 3, 2016
Posts
5,858
Location
SW Louisiana
You likely have one of 2 things going on, the air conditioner is pulling too many amps (may be a bad capacitor), or the generator is not adjusting to load.
 

John Hilley

Well-known member
Joined
Mar 11, 2009
Posts
1,949
Location
Buxton, ND
Sounds like a generator problem. You can test with electric space heaters and microwave to see if it does the same thing.
 

Bob Rivers

New member
Joined
May 12, 2019
Posts
3
Location
Louisa, VA
Not sure, but it does speed up when under a load (speeds up when coffee is brewing).  It does not speed up or bog down when it shuts off when only the AC is running.
 

Gary RV_Wizard

Site Team
Joined
Feb 2, 2005
Posts
76,153
Location
West Palm Beach, FL
Both types of generator increase engine power when under load, but only the inverter type actually changes rpm. The other type is applying more power to maintain  constant rpms. It may be hard for a non-tech novice to tell the difference.
 
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