Running Both Air Conditioners On 30 Amp System

My slightly newer Suncruiser has an energy management system that allows easy operation of both air conditioners on 30 amp service (all the MH is setup for). It will shed an A/C if the microwave or something is used. If weather is hot, I run the hot water heater on gas so it doesn't cause an A/C to shed.

I use to have a 30 amp motor home. Under "just the right conditions" you could run both AC's, but that was rare, you certainly couldn't count on it. I did some research and found a box to install that allowed both AC's to run. I can't remember the name, but do some searching and I'm sure you'll find it. If I remember right the generator is wired like a 50 amp service so there's separate legs to each AC, and you split off one of those lines into this box and then plug into two separate outlets. I believe that's how it was, like I said can't remember, but it did work, and was somewhat easy to install.

I have run both of mine on 30 amps and have blown some circuit breakers on some 30 amp shore power. Not all 30 amp are full 30 amp, wired with large enough wire or is on an overloaded circuit.

supercub wrote:
I use to have a 30 amp motor home. Under "just the right conditions" you could run both AC's, but that was rare, you certainly couldn't count on it. I did some research and found a box to install that allowed both AC's to run. I can't remember the name, but do some searching and I'm sure you'll find it. If I remember right the generator is wired like a 50 amp service so there's separate legs to each AC, and you split off one of those lines into this box and then plug into two separate outlets. I believe that's how it was, like I said can't remember, but it did work, and was somewhat easy to install.

It's called the Power Solutions Dual Power Adaptor.

Thank you all. A lot to take in here.

My 30 amp Winnie runs 2 all the time and has since 2008. I din't do a thing but adjust the temp how I want it.

Multiple methods
1: if the condensers are clean, and the batteries are full, and I do not heat water, cool food or watch TV, 30 amps is just precisely enough (27 actually) to run both my A/Cs.

2: Some Rv's have an Energy manager (Load shedder) system that can alternate between Front and Rear A/C.. Running first one, then the other, on 30 amps.


3: There used to be a company Power Solutions RV, however their web page has not been accessable for a long time, and there still is another comnpany that makes a much more complex and expensive product. The following is the PSRV design simplified

Existing RV wiring

{lots of stuff} (see below) ========wire to rear A/C======Rear A/C

Modify as follows:

{Stuff}======xx========A/C

{Stuff}=======Outlet/plug={20 amp breaker}= =======A/C

Now the plug and outlet (and the breaker) are in a box in an outside compartmetn.


On the PSRV the outlet was a pigtail and the PLUG was a fixed inlet but you can do it the other way around,, Just be sure to use 20 amp rated hardware

Normal use,, plug goes into outlet RV works exactly as designed/shipped

30 amp site

Pull plug, and using a 12ga Extension cord extend it to the 20 amp outlet in the park's pedistal..


I said "Lots of stuff"

Shore cord, Generator (if any) Automatic transfer seitch (If any) Breaker box, and all the other electrical stuff in teh RV

How I did it

I disconnected the line from the circuit breaker,, ran a new line to an outside compartment,,, Ran a line back from the outside and hooked up in a junction box (Breaker can be added to the junction box) NOTE: Wire nut connections between flexible (Stranded0 and solid (Romex) wire are not the world's best invention, i've had two of them fail.. that was one.

By the time you rig up something special it might be just as easy to upgrade your RV to 50 amp service. Permanently more convenient for every day use not just the two air conditioners.

Need a 50 amp cord and a 50 amp panel. Only hard part depending on access will be to pull new 50 amp romex from the cord inlet to the panel. Possibly upgrade your generator transfer switch if you have one.

Hi,

It sounds like a variation on the "cheater" cables that are sometimes used by 50 amp rv's when in a 30 amp park. The want a mere $700 bucks for it, including the installation kit. They get around the 30 amp main breaker by having a 20 amp breaker in their "box". I'd rather run a secondary shore power cord for say $30 bucks total?

http://www.pplmotorhomes.com/parts/rv-power-cords/jtb-power-solution.htm

Tinstar wrote:

supercub wrote:
I use to have a 30 amp motor home. Under "just the right conditions" you could run both AC's, but that was rare, you certainly couldn't count on it. I did some research and found a box to install that allowed both AC's to run. I can't remember the name, but do some searching and I'm sure you'll find it. If I remember right the generator is wired like a 50 amp service so there's separate legs to each AC, and you split off one of those lines into this box and then plug into two separate outlets. I believe that's how it was, like I said can't remember, but it did work, and was somewhat easy to install.

It's called the Power Solutions Dual Power Adaptor.

Always looking for simple and inexpensive. My generator is wired so that it runs the house power off of its 30 amp breaker and includes the rear A/C unit. The front A/C unit is wired to a separate 20 amp breaker. So I simply put a transfer switch on the 20 amp line to A/C unit and installed a box beside it with a plug for an extension cord. You have to set two switches and plug in the cord to a separate 20 amp circuit. Cost < $30.