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Old 05-06-2012, 10:19 PM   #15
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Originally Posted by joelm View Post
I have a 1996 Winnebago Adventurer with 2 ac units. I can run 1 unit on 30 amp shore power or both units with generator running. Can I adapt my 30 amp plug to a 50 amp plug and plug into 50 amp shore power without causing any damage. This should allow mw to run both ac units when pluged into shore power, right?
The real answer is: Yes, it can be done, but only by someone who is knowledgeable in RV electrical systems.

The other half of that answer is: No, because if you have to ask this question, you cannot do it yourself.

If you REALLY want this done, hire a qualified electrician who understands how 50 amp RV service works.

Best of luck,

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Old 05-07-2012, 02:55 PM   #16
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As was mentioned previous;ly, your generator has two output circuits, one of 30A to power the coach main distribution panel and a secondary 15A that bypasses the main panel to power the rear a/c directly. Or you may have a switch that allows the secondary circuit to power either the front or the rear.

Hooking up to a 50A outlet using a standard 30A/50A adapter makes 50A available to your main distribution panel, but the 30A breaker there prevents the panel from ever drawing more than 30A. And that is necessary because the components and wiring are only designed to handle 30A max. Plus, there isn't even a way to get power through the distribution panel to feed both a/c at the same time.

This could all be modified, of course, if you are willing to spend some money. It may or may not be difficult/expensive, depending on just what you now have. An RV electrical expert would have to look it over to see.

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Old 05-08-2012, 02:31 PM   #17
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Assuming it's really hot where you are and you would like to do this ASAP:

Quick and inexpensive way to do it is to remove the rear inside AC cover, find the input power leads, black & white, (there will also be a green or bare ground wire connected to the metal frame of the AC), disconnect the black and white supply wires and cap off with wire nuts. Then wire in a heavy duty extension cord, the shorter the better, in place of the original wires, connect the green ground wire directly to the metal frame. Route the cord out a window. Plug that cord into a shore power 20A outlet. Generally, they will have a circuit breaker already there at the post, but if it's remote (I do see this occasionally), I'd add a box with a 20A breaker or a 120Vac, 15A slo-blow fuse.

What you're thinking about, using the 50A outlet somehow, probably isn't the best method with a 30A RV. First thing you'd need is a 30A shore cable that has 4 wires instead of just 3 like yours does now. Or buy a 50A shore cord to replace your 30A. Both ideas are kinda spendy just for the cord.

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Old 05-08-2012, 09:32 PM   #18
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The difference between a 30 amp and 50 amp RV is simple. The 30 amp is 1 leg (115 volts), a nutrual and a ground. The 50 amp is 2 legs of 115 volts (230 volt), a nutrual and a ground with each leg capable of 25 amps x 2 = 50 amps. It would be major surgery to split the entire circuit in your coaach
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Old 05-08-2012, 11:32 PM   #19
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Originally Posted by chuckftboy View Post
The difference between a 30 amp and 50 amp RV is simple. The 30 amp is 1 leg (115 volts), a nutrual and a ground. The 50 amp is 2 legs of 115 volts (230 volt), a nutrual and a ground with each leg capable of 25 amps x 2 = 50 amps. It would be major surgery to split the entire circuit in your coaach
Close, but no cigar. First, it's neutral, not nutrual; second, you get 50A on each leg of the circuit, not 25A.
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Old 05-08-2012, 11:37 PM   #20
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Originally Posted by Alan_Hepburn View Post
Close, but no cigar. First, it's neutral, not nutrual; second, you get 50A on each leg of the circuit, not 25A.
Yep, it's two legs with 50 amps each or 12,000 watts rather than 3,600 watts on a 30 amp circuit.

2 X 120 X 50 = 12,000 watts
120 X 30 = 3,600 watts

We were in one campground near a casino in OR and they advertised 50 amps. Looked at the breakers and they had a 30 on one leg and a 20 on the other rather than two 50 amps that are required for 50 amp RV hookup. Worked OK but it was cool and we didn't need the heat pumps then.
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Old 05-09-2012, 02:10 PM   #21
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Still say you can do it.. Run one leg of the 50amp to the distribution like it is now. Run the other to a 20amp breaker, then to the AC. Total separate circuit would be required..

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