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Old 08-28-2015, 04:32 PM   #1
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Would this plug work with 50A?

I am considering this 7500W generator that has this plug set (see picture)

My RV is a 50A 5er. I do have a 50A > 30A conversion cable.

Anyway, I notice that this round outlet is 120/240v. Campgrounds have 120 volts at 50A.

So, can I plug in my RV to this generator? If so, would it be powerful enough to power 2 ACs and lights?

PS. Made by Westinghouse..


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Old 08-28-2015, 04:35 PM   #2
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What size breakers? Looks like 240 v 30 amp. Will work but running a AC on 30 amp would allow you run both but wise use of other things like HW Heater etc. Lights and TV would work, maybe a Dometic fridge as well.
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Old 08-28-2015, 04:42 PM   #3
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So can I plug in my 50A cord directly to this as it is? I was concerned because it is labeled 120/240, and I wouldn't want to put 240v into my RV that is supposed to be 120v.

Or am I misunderstanding the voltage issue here?
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Old 08-28-2015, 04:48 PM   #4
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You will need on of these......

50 Amp 125/250V RV Female to 30 Amp 4-Prong Twist Lock Male Generator Adapter - Lippert Components Inc FP52GEN4-SB - Generator Accessories - Camping World
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Old 08-28-2015, 04:58 PM   #5
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Fonzie has you fixed up with the proper adapter for the generator.

I can't tell from the pic of how many amps the twistlock outlet can provide. I can guesstimate it being a 7500 watt generator, but wouldn't want to provide false info.

This link may help you better understand what 120/240 split phase service is ....as far as at the campground.

Electrical Tutorial - Chapter 3 - 30 Amp versus 50 Amp
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Old 08-28-2015, 04:59 PM   #6
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I agree with fonzie here you will need a cable adapter to connect the gen to your RV. The gen looks to have a 30 amp out twist lock type connector so the adapter fonzie talks about would work great. The 30 amp twist lock connector on the gen will only use three pins for 120v the forth pin is if you need 240v for some application. The RV type adapter will only use the three leads so only 120v. Of course you will be limited to 30 amps on this arrangement although you can use your 50 cable directly.
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Old 08-28-2015, 05:10 PM   #7
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Quote:
Originally Posted by clr View Post
I agree with fonzie here you will need a cable adapter to connect the gen to your RV. The gen looks to have a 30 amp out twist lock type connector so the adapter fonzie talks about would work great. The 30 amp twist lock connector on the gen will only use three pins for 120v the forth pin is if you need 240v for some application. The RV type adapter will only use the three leads so only 120v. Of course you will be limited to 30 amps on this arrangement although you can use your 50 cable directly.
Clr, it should work just like it would at the campground on a 120/240 volt split phase outlet as he has a 50 amp RV. It will use BOTH hots, the neutral and the ground. The panel in the RV keeps the legs separate (thus no 240) and utilizes EACH hot leg separate for 120 volts only. It's explained in the link I posted above.

The OP will be limited to a max of 7500 watts, and that could be peak watts, not running load watts. A campground 120/240 volt 50 amp split phase service is capable of providing 12000 watts.

However, when you are plugging a 30 amp camper into a 120/240 split phase outlet, then what you stated is true. The adapter in that scenario, only utilizes one hot leg, the neutral, and ground.....and the second hot leg is basically capped off inside the adapter.

EDIT: This schematic should help in understanding how the two hot legs are separate in the RV and thus remain 120 volt. You would need both hot legs running to an outlet or appliance in the rv for it to be 240.

The problem is when someone hooks to a 240 outlet that is wired in a way that the allows the second 120 volt leg to go thru the normally neutral wire.




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Old 08-28-2015, 05:20 PM   #8
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this is why I am confused...

Some people here say that they can run their campers A/C with as little as 3000 watts generators. Such units certainly don't have 30 amp outputs but they will run at least one AC unit

OTOH, this is a 7500W generator. I have looked and the only generators I have seen with the 50A output PLUG (but labeled as 30A service) are 10,000 watt generators.

This generator is labeled as 30A at the 120/240 plug, which is the same as the 10,000W generators. SO I wonder how it is that getting 2,500 more watts also gets me a genuine 50A plug outlet, but still is rated at the same amperage as this 7500W generator?

Furthermore, why do I have to go up to 10,000 watts in order to get the plug I need for my 50A RV, especially seeing as they both provide 30A, though the watts are different?

What I really want is just enough watts to run my camper at least on one A/C, with the right plug on it without needing an adapter. I have been reading here and see that some people have had success with as little as 3600W gennys. Getting a 10,000W genny seems like overkill, but then again, that is the only genny with the correct plug. Any other generators have this kind of plug, and you have to get an adapter. What's up with that?
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Old 08-28-2015, 06:03 PM   #9
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If you were to check voltage on the 120/240 plug it will be 120 to ground/neutral and 240 between the two hot legs. With 30 amp breaker for each leg that equals 7200 watts 30x240.
A 50 amp RV uses two hot legs 120 each it could be two parallel 120 as in an adapter plug or two separate legs that has 240 across them.

Finding a generator with an RV 50 amp plug will be a challenge. The generator shown should be more than enough to power you RV.

You might be able to change the generator plug.


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Old 08-29-2015, 01:24 PM   #10
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I have the same plug on my generator at home and use a plug to power my home when the electric is out. It splits the electric into two 120volt lines to power three air conditioers in the house. The generator is a champion 7500 watts. It does an excellent job. I bought an adapter for for my trailer that goes from 4prongs twist lock to 50 amp plug for the trailer
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