My Ac will run fine for about 2 hrs and then bog down creating a significant voltage drop and if connected to a generator will trip the overload switch on the generator. This only occurrs after the temperature is reached and he compressor is restarting. This is a penguin 13500 Duo therm ac with an auto thermostate located on the wall. could this be a bad thermostate or a time relay switch that is faulty?
Try replacing the wall thermostat with an electronic unit. It sounds like it is short cycling. If there is not at least 5 min delay before trying to restart the compressor this is what happens. Most electronic thermostats have a delay feature built in to solve this problem.
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If it is a normal AC for RV then I would suggest something over 4000 watts, the AC's have a very high start amps.
You would really need to know how many amps the unit draws or is rated to draw when looking for a generator. Too small of a generator and it won't work, plus you could damage the generator and the AC unit. I would call an RV store and ask them as that is something simple for them to answer.
there is a fuse located under the shroud on the roof AC on a circuit board that controls the thermostat to turn on the power to the Air Conditioner replace it it is marked F-1 or, on some F-2 etc. the air conditioner works on both DC voltage for the thermostat and AC voltage for the compressor
Unit may pull as much as 17-18amps when compressor starts up, but level out to 12-15 amps when up and running. Keeping in mind that is all relative to proper 120v incoming voltage, heavy enough wire to run the application etc. If your AC unit needs cleaning , it may draw an extra amp or 2 . With that said, when your at the park, first thing I'd question is their incoming voltage to RV, and try running fridge etc and anything else on propane if possible. The AC alone should not cause 30amp at source breaker to trip, before 15 0r 20 amp breaker in RV that is connected to AC trips. If it doesn't trip your breaker at home, and all is connected same at park, then I certainly would suspect bad breaker or voltage/wiring at park is the cause. P.S. I noticed you said you have 12 gauge wire (rated at 20 amps) connected to a 20amp breaker at panel, but RV is plugged in to a 15amp receptacle, I will assume with a 15 amp adapter from 30 amp plug. Do you see any hazard regarding 15 amp rating on receptacle? ( just a little advice.)
Thermostat on wall, or manual controls at AC? Did it work for you on low before now? Reason I ask, is that normally they are only a 2 speed fan ( low and high) so if it's a wall thermostat and has been changed from original, perhaps it the way the thermostat is wired.
Your wire size and breaker is correct and should be fine as long as all connections are tight and plug and receptacles are OK. Does any part of the wire get warm? Check the temperature of the plug (plugs/sockets) and cable at each end.