Dometic ac and Onan generator

[Kpackpackkelley]

Ac starts and runs fine on shore power but compressor tries to kick in on gen but can’t in two minutes it’ll try again. Ac start up amps are around 15 amps , running amps 10 or so amps on shore power.
Generator volts around 120 volts 62.5 hz no load and will run and start a microwave and heat gun at the same time no problem.
Generator is a 4k onan microlite spec p I’m stumped seems like the generator is doing everything it’s suppose to.

[wa8yxm]

One thing which is your friend is the Kill-a-watt meter. I measures many things. in this case we are just going to plug it into an outlet not plug anything into it

HZ and Volts are what we need to monitor as teh A/C tries to start.

Some multi-meters can do that as well but the Kill-a-Watt is so easy. and 20 bucks.

Page 2
Be sure to turn off the A/C for at least 3 minutes when switching from Shore to Generator or the other way around.. I like to just shut down the motor home for 3 minutes electrically when "Transferring".

[Kpackpackkelley]

enblethen wrote:
If the hertz does not drop to right at 60, then it is set too high or the regulator is failing.
Start with cheap items first! I had to replace my regulator. Got an after market one. Flight systems

I know what you mean. If I have to I’ll wire the gen straight to the ac and bypass everything to check it . Somethings going on screwy but when l get it tracked down I’ll post what the problem is.

[enblethen]

If the hertz does not drop to right at 60, then it is set too high or the regulator is failing.
Start with cheap items first! I had to replace my regulator. Got an after market one. Flight systems

[Kpackpackkelley]

enblethen wrote:
I would start by checking all the connections. Inspect, disconnect and re-terminate all the wiring in 120 volt distribution panel and transfer switch. Pay special attention to the neutrals in the back portion of the distribution center. Get some electrical de-oxidation grease. Coat the bare conductors prior to terminating. Look for melted insulation and burnt conductors
Genset is running a little too fast which is causing the higher then normal frequency.

Thanks that’s where we usually set the no load hz but I know what you mean. I’ll start with the connections. Thanks it’s kind of a weird one.

[enblethen]

I would start by checking all the connections. Inspect, disconnect and re-terminate all the wiring in 120 volt distribution panel and transfer switch. Pay special attention to the neutrals in the back portion of the distribution center. Get some electrical de-oxidation grease. Coat the bare conductors prior to terminating. Look for melted insulation and burnt conductors
Genset is running a little too fast which is causing the higher then normal frequency.