Originally Posted by ericlakin
I have the 3.2KW diesel gen in my Sunseeker 2400R. I occasionally get a "Short Circuit" error on the Cummins Onan display when the AC compressor starts up, resulting in generator shutdown. The dealer looked at it last year and said a wire was loose in the AC unit and it seemed to be fine since. This past week it gave the error again right when the AC compressor started up, but with subsequent tests I could not reproduce the error. Nothing else was running. Fridge was off. Microwave was off. Not on shore power. MBS engine not running. Not extremely hot outside.
I have read that switching to an Atwood AC unit results in less load on the generator. Not sure how difficult that switch would be nor the cost. If we keep this little MBS for a while I might look into that. Has anyone done this sort of switch recently? There have been some similar posts but they are so old I could not reply to them to get the conversation going.
We were fed up with the noise level of the Dometic 13.5K A/C and the hard starting of that unit on our Forester MBS. We also have the Cummins/Onan 3.2KW diesel generator. I installed an Atwood 15K BTU heat pump and it works great. Cooling is better, noise level is much less and there are three noticeably different fan speeds. The diesel generator starts the Atwood with no issues even with the converter charging on high.
The install took me the better part of a day, as I am not an experienced RV tech. I have a forklift and a scissor lift which made getting the A/C off and on the roof doable by one person. Obviously without that kind of equipment, the job is not easy. The inside work was straightforward once I figured out the wiring differences for the Atwood thermostat.
It's not an inexpensive mod, but the Atwood was on sale at PPL Motorhomes when we bought. For us, the expense was worthwhile given the lower noise, better cooling (and heat function too) and lower load on generator.