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Old 03-26-2015, 09:21 PM   #11
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You won't find one with that outlet, you will have to wire it up direct with a transfer switch. Generac makes a few units that the class a motorhomes use that can supply enough power for two ac units, which is what your 50 amp service is for.
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Old 03-26-2015, 09:25 PM   #12
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Originally Posted by wmtire View Post
That's why I said that the 50 amp is often misunderstood. As the others have pointed out, it is 50 amp per leg (100 amps total).



Here are some more links that explain it better than I can.

RV Electric
(click the 50 amp service tab on the left side of the screen)

RV Electrical Systems
(scroll down to 50 amp vs 30 amp)

The main thing to remember that even with a 50 amp service, the two hot legs are utilized separately and everything in the RV is still 120 volts.

It took me awhile to get my head straight on all this too.
Thanks...I stand corrected and your link was most helpful. Obviously...I'm a 12V guy!
Now...I got my impression from marinas where I've both stayed and worked that use 50amp pedestals with 100 amp service TO the pedestal and one 50 amp plug on each side...each with a 50 amp breaker....
I know that boats trip the 50 amp breakers with well under 100 amps in use...so am I correct that it is the breaker that is the limiting factor and that "50 amp service" at RV parks and marinas is a result of the breaker and supplied current rather than the plug?
If so...are there RV parks which actually use 100amp breakers on their "50 amp" plugs to enable that 12000 watt capability?

*****Thnks also to the others to jumped in to clarify! Ya learn something new here every day!******
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Old 03-26-2015, 09:26 PM   #13
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Originally Posted by iowasparrow View Post
You won't find one with that outlet, you will have to wire it up direct with a transfer switch. Generac makes a few units that the class a motorhomes use that can supply enough power for two ac units, which is what your 50 amp service is for.
Not true, my Champion came standard with the 50amp outlet. While a rarity, they do exist.
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Old 03-26-2015, 10:04 PM   #14
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Quote:
Originally Posted by iowasparrow View Post
You won't find one with that outlet, you will have to wire it up direct with a transfer switch. Generac makes a few units that the class a motorhomes use that can supply enough power for two ac units, which is what your 50 amp service is for.
In post #2, I have a link to a Champion generator at Home Depot. It may be the same one jonrjen has.
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Old 03-26-2015, 10:18 PM   #15
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no, because both legs are hooked to one 2 pole breaker, and if either leg exceeds 50 amps, both circuits are dead. Basically you could draw 1 amp on 1 leg and hit 51 on the other, and blow the breaker. To be 100 amps of service it would have to be wired on a way that you would need to exceed 100 amps to blow breaker
davel1971 has the right premise. The 50 amp service is a 120/240 volt split phase service. It utilizes a double pole breaker (L1 and L2), that is connected together. You get 50 amps from L1 and the other 50 amps from the L2. In simple terms, the system has to do with load balancing and wire size.

I found the site I was looking for that explains it better with diagrams. If you read the 50 and 30 amp parts, it will do it more justice than I can.

If it wasn't a 120/240 split phase service, then you would have to have wire sized for 100 amps single phase (and you think your 50 amp cord now is heavy and hard ). With the way the breaker and split phase service works, then you can safely use wire for 50 amps (instead of 100 if single phase)

Electrical Tutorial - Chapter 3 - 30 Amp versus 50 Amp
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Old 03-27-2015, 04:07 AM   #16
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Thank you

Thank you everyone for some great insight.
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Old 03-27-2015, 01:54 PM   #17
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The OP asks for a 50amp generator but I can't help but wonder if he would rather have a 50amp Inverter. The difference in noise between an open frame generator and a somewhat sound enclosed inverter is significant. I use the Champion 3100 Inverter with a 50amp to 30amp dogbone and it works fine so long as I don't do both A/C and a microwave for instance.

I just upgraded to a 50amp fifth wheel and I initially was looking for a 50amp inverter. I found two that seemed acceptable, although as previously stated, that 50amp receptacle only gives you 50amp not the 50amp-per-leg (ie 100amp) that is the standard. None the less, if you get a 50amp inverter, you can run both A/Cs.

The two I found are the:
-- Honda eu7000is $4,000 262lbs 52-60 dbA Wise Sales (High price, excellent reviews)
-- Lifan Energy Storm 5600iER $1,700 192lbs 59db Home Depot (good price, mixed reviews)

One last tidbit is that I ended up speaking to the National Sales Manager for Lifan and he said they will be replacing the Energy Storm 5600 with an Energy Storm 7000. The 5600 is rated 45amp, the 7000 will be the same amps as the Honda (50 or more). The weight, cabinet size and loudness will be the same. Like Honda, they are going to fuel injected, thus the increase in power without an increase in weight. Price is expected to hit Home Depot and others at $1,999.
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Old 03-27-2015, 02:48 PM   #18
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Lot of going back in forth on electrical service. I guess I'll put my 2 cents in. Bigger RVs require more power mainly cause of the 2nd air conditioner, and possible bigger fridge or another outlet circuit. If Load balance is correct then both legs should have about equal amp draw. Since you are using 50 amp 220 service and as said before if both legs are utilized correctly then you have more than enough power on both legs. Question is do you really need it and use it. I would think 30 amp 220 service would be plenty. That would be to confusing to most rv owners making reservations or etc. Hey do you need 30 amp 110 or 30 amp 220. Its easier to say do you need 30 amp or 50 amp. Anyways back to original question I havent seen a portable generator with a 50 amp plug, but you should be good with like a 5500 or 6500 watt that has the 220 volt 25 amp twist lock outlet. Just make you a pigtail/adaptor yourself to plug in to it. If your questioning my judgement think about this. Most TT with 50 amp service requirements with onboard generators are 5500 watts.
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Old 03-27-2015, 02:50 PM   #19
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Originally Posted by JohnRiordan View Post
Lot of going back in forth on electrical service. I guess I'll put my 2 cents in. Bigger RVs require more power mainly cause of the 2nd air conditioner, and possible bigger fridge or another outlet circuit. If Load balance is correct then both legs should have about equal amp draw. Since you are using 50 amp 220 service and as said before if both legs are utilized correctly then you have more than enough power on both legs. Question is do you really need it and use it. I would think 30 amp 220 service would be plenty. That would be to confusing to most rv owners making reservations or etc. Hey do you need 30 amp 110 or 30 amp 220. Its easier to say do you need 30 amp or 50 amp. Anyways back to original question I havent seen a portable generator with a 50 amp plug, but you should be good with like a 5500 or 6500 watt that has the 220 volt 25 amp twist lock outlet. Just make you a pigtail/adaptor yourself to plug in to it. If your questioning my judgement think about this. Most TT with 50 amp service requirements with onboard generators are 5500 watts.
30 amp 220?
I don't think so.
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Old 03-27-2015, 04:35 PM   #20
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Harbor freight has some cheep and work well but 70+ DB Mine starts easy and runs well but loud.
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