Forum Discussion
What is the power cord going to the shop? Is it a 4 blade 50 amp cord or a 3 blade 30 amp cord? Are there any adapters or extensions on the cord?
When the 30 amp breaker trips does the main AC continue running? If so you are probably on 50 amps.
Without having any more information I can only hazard a guess.
If the 30 amp breaker is working fine with the portable AC unit running right up until there is a second significant load on the system. A load such as the water heater (on electric) coming on. Or the Microwave turning probably trips the breaker. If this is the case then you just need to be careful of your loads. Turn off or put the water heater on propane when you're running the portable AC. Temporarily turn off the portable AC to run the microwave. You can turn it back on once the microwave finishes.
Lack of water pressure can be many things. Are you running your water off the onboard fresh water tank and pump? Or are you hooked up to water from the shop?
If it's lack of pressure and flow out of the faucets try unscrewing the aerators out of the end of the faucet. With the aerator off you'll know immediately if it was plugged up and causing the problem. If you're on shop water try putting water in the fresh tank and run off the pump. Is there a difference?
I can only run both my air conditioners on SOME 30A circuits.
I am thinking of getting a portable AC but I would run a heavy extension cord to an extra receptacle - not through the RV panel. Of course, her husband's shop might not have another circuit available.
My 5er is 42' and it needs THREE ACs.
- Slackware1995Jun 28, 2025Explorer
I was going to say that very very very few 40 foot 5th wheels come with a single AC. Even two 15K btu AC units is tough with that large of a 5th wheel.
I have a 35.5 foot (floorplan) 5th wheel with a 15K btu and 13.5K btu AC and if I don't start them early (before the inside temp hits 70F) they will really struggle in 90F temps. I'm thinking about upgrading the 13.5K btu AC to a 15k btu.
- StirCrazyJun 29, 2025Moderator
a lot do, depends where you live. in the northwest and Canada almost all 40 and 42 foot 5th wheels have 1 ac and are prewired for a second. yes you can get them with two, but those are special ones from the factory or the dealership ordered it with two. a second or third ac is an addon and a "money maker" so usually they are not in the base. my 5th is 42 feet long (overall) and has 1 ac prewired for a second, no way to add a 3rd unless you fish new wires through the walls and celling. it was a 89K 5th wheel.