Generator and rear A/C

i'm confused about your statements on generator wiring

either you have TWO single pole breakers
or ONE double pole
if you have one double pole you do NOT have a single 30amp main

if read 28amps on one leg and zero on the other, you have an open circuit
someplace

please post the model# of your generator
and a picture if possible
and picture of the breaker you are talking about

Thanks for the replies so far. To answer and clarify for the above questions and suggestions. It's only when I try to run both AC's at the same time. I made sure fridge was on gas and inverter/charger was not charging at the time. Clamped meter on main 30 amp lead and had 0 amp draw prior to checking. The week before I cleaned both coils on both units. With one AC running I'm drawing 13-14 amps after start up. Only 0.2 amp difference between units when running one at a time. Amps level off around 28 amps with both running and slowly creep up until breaker trips (5 minutes or so).
I'm also confused if the second leg of the gen powers the rear AC only why am I seeing the draw on the wire feeding the 30 amp main?

I had a problem somewhat like that.. one A/C was popping the 20 amp inside the RV that feeds it... Well, went topside, "Popped the top" (Properly removed the covers) popped the cover on the condenser.. Said OH MYYY". cleaned a whole bunch of crud off the coils... Problem solved. And then replaced covers.. Been 2.5 months since problem and not one trip since.

A single 30 amp two pole breaker, would indicate the generator is wired for 230v output and 6900VA aka Watts
The problem with this is that over loading only one side trips the breaker and kills power to everything in the house
Also a 230v system should have the loads evenly distributed between both legs
Not wired like smaller RV generators with a dedicated 20 amp circuit for one a/c
Have you put the fridge and the water heater on propane, not on auto mode or electric
What is the condition of your batteries, If they are drawing a heavy charge, that adds to the load on the generator
On hot days like today 102°F
I try to start early charge the batteries before running the A/C
Then try to get the A/C going before it's 90° + inside
And try running only one for awhile, don't start both only minutes apart
They are working the hardest when they first startup
Two starting up one after the other will be a very heavy load

There should be a switch for the rear air to power it off either shore power or genset power- IIRC, Fleetwood often put them in overhead compartments.

FWIW- I disagree with Fred about the SPP4E- that is not the correct capacitor for a 13.5k btu unit, and capacitors are not at all your problem, anyway.

This is from another question asked a few weeks ago.

By installing a SPP4E, you can quickly start the compressor, and it will be in "Locked Rotor" amps for less time, making it easy on the generator. It shows pictures of the capacitors, and that might be the broken part on your A/C unit.

Beyer wrote:
I have a 1996 camper with a Coleman A/C. I bought the Supco SPP4E. My A/C has 2 round capacitors, one small and one large. The small one has 2 wires and the large has 3 wires. Which one do I replace? Both?
Pics:

http://i1372.photobucket.com/albums/ag321/beyer25/Mobile%20Uploads/image_zpsf3f66b5c.jpg

The small capacitor with wires going to the outside fan is the wrong capacitor. THe one with wires going to the compressor is the correct one. Typically the red and another color wire go to the compressor along with a black one. Don't connect to the black one. Use the red wire and yellow wires. You want those two connections.

You do NOT take out the factory capacitor, just add the second one to the compressor circuit to help shorten the time it spends in "Locked rotor" amperage, and shorten the time it takes to get up to full speed.

Make SURE that you put a screw into the existing capacitors tie down strap, or it can short to ground if the metal from the wires shorts our to the metal of the clamp.

If your compressor is not working right, then replace the small round capacitor with the red and yellow wires on it. It might be 25 MFD or 35 MFD, replace with the same size. Shape is less important, you probably can find one for about $10 that is oval, or round one for a couple bucks more.

Fred.

Yes a 7500 watt generator is able to produce 30 amps per leg.

You might want to check the rooftop A/C and see if it has a bad capacitor? It is something significant if it trips a 30 amp circuit breaker. Is it only when the rear A/C is put in cooling that the circuit breaker trips?

Are you running anything else, such as the water heater on electric, or coffee maker or microwave? The water heater might draw 8-11 amps, while a coffee maker can be 8-12 amps, same with the microwave.

Fred.