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Old 01-16-2022, 09:06 PM   #1
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Join Date: Jun 2020
Location: Dallas, Texas
Posts: 506
Connecting Onan 5500 to Home Transfer Switch

Last winter during the Great Texas Freeze, I hooked up my Portable 3500 KW generator to our home Connecticut Electric 7500 watt Transfer Switch. It proved to be very valuable to us. However; as I only had a 3500 watt generator at the time of original install, I did not include the pool equipment (20 amp breaker) in one of the 4 available 20 amp breakers on my home transfer switch. As a result I watched my pool, pool heater and pool pumps freeze as there was nothing I could do. ( Well we could Ice Skate on the pool which was kind of cool

We keep our RV at home and it has 5500 Onan. If I had a L14-30R inside my electrical bay, I could have connected my RV Genny to the House Transfer Switch. If I am successful with getting the L14 - 30R above in the RV, I will rewire one of my existing 20amp circuits to supply backup power to the pool equipment. I will then use the RV to genny to supply the house and retire my 12 year old 23500 genny.

My question is how hard is that to do or should I have a Dealer install?

I have ordered the below receptacle, to get things started even if I can't do myself.


My genny has two 30amp breakers, the L14-30R requires 4 wires (2 hot Red & Black) to go over 3750 watts. How do I select which of two 30 amps breakers to use, or is it just only 4 wires coming out of the generator period?

I am thinking I will need a junction box for the feed from generator that goes to the receptacle I ordered, and a line out that goes to the RV Automatic Transfer Switch?

Or should I look to wire it some other way, have an electrician do, or just not attempt to do at all?

Thanks
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