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Do you have the water heater on AC mode? That is the usual cause of this OR some other AC use that is overloading the circuit.
Are you starting this on high fan and then moving to high cool after a few minutes?
Yes.........and they are usually marked clearly as to "Hi Fan", Lo Fan", High Cool, and Lo Cool and "Heat" if you have a heat strip. No manual for this?
Can you attach a photo of the controls to your post so I can see them?
Is this a Coleman or a Dometic A/c?
Did they wire this up on a 20 amp breaker and use #12 wire or do you know?
Take a look at the attached link and tell me if this is your control panel. http://www.ebay.com/itm/Dometic-3310741-016-Polar-White-Non-Ducted-Manual-Air-Conditioner-Controls-AC-/131402789205
You would be surprised at how often this gets messed up by these specialized vendors. You can check by going to the breaker and see what wire size is coming out of there.
Attach a photo of those tomorrow if you can and I will try to get one from my shop so I can this up close.
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?
Lights like that don't draw much. Chances are your water heater is on AC mode. Turn that to LP mode and your fridge to LP mode to save power. As the ambient temps rise, so does the power consumption on the A/C. It can draw an additional 5 or 6 amps on a very hot day.
Shade the A/C if you can to reduce the ambient temps AT the unit. That can save you several hundred watts.
How big is the generator here? Most units can't support any microwave use when the A/C is running. Even a small one uses about 800 watts. Did someone wire up the trailer for AC uses? I am wondering if they used the wrong wire sizes or breakers? Do you know what those are here?
I see we convered part of this before...........had to go back and re-read some of what was discussed. 4K should work here, but no other big draws. How many watts are the lights each? It might be the wire size here. We need to find that out.
Keep in mind that 30 amp under ideal conditions (120 VAC input) gives you 3600 watts of power. AC on a real hot day can use almost 20 amps or 2400 watts. If the input AC voltage is lower, the amount of watts drops as well. Add up the uses. See what that total is and let me know.
What is the make of your generator? You might be able to upgrade to a slightly larger unit and solve this. No hurry.......just wanted you to know I was here if you needed more.
Sell it and get a good unit. Generac makes some good ones. Get at least a 5K unit and best with electric starter. That would save you some headaches now and down the road.
Hopefully, you got this resolved as I didn't hear back from you. You can always return to this posting again if you Bookmark it and we can do a follow up. All part of our service and please take time to enter a rating as that is the only way I get credit for my time spent helping you. Thanks! Be safe........