30A vs 50A

tropical36 wrote:
Not sure I get this and there should be a relay of sorts somewhere and even if your rig doesn't use a transfer switch for powering the rear ac from either the genset or shore power.
Simply spitting this 20amp rear ac genset circuit by using a 20amp plug and receptacle, will allow one the option of plugging into a separate pedestal circuit and thus freeing up the full 30amps for the rest of the coach. It's called a dual power adapter and there used to be a company out there that coined the term and sold a kit of hardware items, along with the instructions to go with it.
What you have shown, looks pretty elaborate and seemingly unnecessary. On the other hand, I really don't know what you have there without doing an evaluation of my own.
Also, on second thought, I did have an old coach at one time, with an inside switch for choosing the front or rear ac, but still could be wired as I've explained and as long as the genset has a 20amp breaker for solely feeding the rear ac.

Motor home did not have a 2nd A/C originally installed but was wired for EXCLUSIVE running from the generator.

The motor home has 30 AMP input.

I added a 2nd A/C unit (15,000 BTU) and wanted to be able to run both A/Cs while at campgrounds in high temperature Summer heat. Most campgrounds will not allow you to run the generator.

I can now plug into 50 AMP service at the campground - plug the 30AMP shore cable into the 30 AMP receptacle on my box, and plug a 20 AMP cord for the 2nd A/C into the 20 AMP receptacle on my box.

Most campgrounds have both 30 AMP and 15 or 20 AMP receptacles, but sometimes they may not be reliable. Plugging into a 50 AMP campground receptacle increases reliability. My outlet box splits the two 50 AMP feeds via the 30 AMP and 20 AMP breakers shown. My box is configured with a 6 gauge 4 wire pigtail.