Again I will post the PSRV solution and some notes
Original: 30amp on many rvs
Breaker----Transfer switch and generator-----A/C
Modified
Breaker----Transfer switch and generator------Outlet/plug--breaker---A/C
They disconnected the A/C at the generator junction box and wireds it to a "inlet" (*I call it a plug in the diagram) with a 20 anp breaker then on to teh A/C.
NOTE: all added wiring is 12 ga and I really suggest 20 amp connectors, (I used 15's)
On many 30 amp with generator the transfer switch switches the line from the breaker panel to the generator then for some reason Well.. Look up the transfer switch wiring diagrams.
On my 50 amnp rv is was easier since the line runs direct from the breaker to the A/C.. I just unhooked it from the power panel, added a junction box and ran both the 20 anmp line from the breaker (12 ga wire) and the junction box, to an outside comnpartment where I plug 'em into each other.. Works great.
Oh and also use 12 ga extension cords.
