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Old 11-02-2015, 10:37 PM   #15
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If you have a generator compartment pre wired for 50 amps install one of these. Rated at 58.3 amps with two 30 amp breakers.

Cummins Onan QG 7.0 Gasoline RV Generator | 7.0HGJAB-900 - Norwall PowerSystems
Still not a 50 amp unit as the OP asked about. An RV 50 amp plug has 100 amps potentially available.
A 50 amp RV plug when wired correctly gives 12,000 watts (50 X 2 X 120). Both L1 and L2 have 50 amp breakers which is why a 50 amp service has far more potential output than a 30 does (30 X 120 = 3,600 watts).
The Onan above gives a little over half the required output for a 50 amp unit.
We did run into a situation at a reservation where they advertised 50 amp service, but there was a 30 amp breaker on L1 and a 20 amp on L2. Luckily we didn't need the heat pumps then.
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Old 11-02-2015, 11:25 PM   #16
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Still not a 50 amp unit as the OP asked about. An RV 50 amp plug has 100 amps potentially available.
A 50 amp RV plug when wired correctly gives 12,000 watts (50 X 2 X 120). Both L1 and L2 have 50 amp breakers which is why a 50 amp service has far more potential output than a 30 does (30 X 120 = 3,600 watts).
The Onan above gives a little over half the required output for a 50 amp unit.
We did run into a situation at a reservation where they advertised 50 amp service, but there was a 30 amp breaker on L1 and a 20 amp on L2. Luckily we didn't need the heat pumps then.
Yes, I know that. However, the Onan is a better option then the threshing machine he's looking at, and will never find a 12,000 watt portable or gas one.
My coach is 50 amp with a 5,500 watt generator, can run both AC's and other low wattage items when on generator. Just need to know how to manage your power usage when on generator. If we want to run the micro I put one of the AC's on fan only until finished with it.
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Old 11-03-2015, 06:18 PM   #17
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Not within 1/4 mile.

Now that's funny !


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Old 11-03-2015, 08:43 PM   #18
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I'm looking for a generator for my Montana 3750 that I can hook up to my 50amp cord. Lots of generators have the 50amp receptacle but only rated for 30amp. Is there some kind of adapter or a way to modify them for 50amp service? I'm looking at the Champion dual fuel Generator. Thanks
Hurricane, what you probably want is a generator with a 50A connection that's wired to provide enough power to do both ACs, and moderate components, correct? That can be well under 12,000 watts.

As pointed out, if you want true "full" 50A - you're looking at 12,000 watts or better.

My guess is that you're probably fine in the 5500 - 9000 watt range, but the trick is finding a generator that has a 220V output with a circuit breaker of over 35A. If you shop, make sure you verify the ACTUAL circuit breaker that's installed - typically in the parts diagram. Don't depend on the sticker.
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Old 11-04-2015, 12:48 AM   #19
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The 50 amp receptacle at the RV parks use either 2- 25 or 30 amp breakers. One for each 120v leg for side of the plug or circuit in the RV. I've noticed several times that a 5000-6000 watt gen using some kind of an adapter from both the 120 30amp outputs. Our Montana isn't pre wired for a onboard Gen set, but I need to have enough power on both 120 legs to run both AC's. We are out sometimes when its close to 100 F out and need both working. Furnace works on a 35amp plug in, just fine. Any one ever use one of these adapters?
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Old 11-04-2015, 01:40 AM   #20
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The 50 amp receptacle at the RV parks use either 2- 25 or 30 amp breakers. One for each 120v leg for side of the plug or circuit in the RV. I've noticed several times that a 5000-6000 watt gen using some kind of an adapter from both the 120 30amp outputs. Our Montana isn't pre wired for a onboard Gen set, but I need to have enough power on both 120 legs to run both AC's. We are out sometimes when its close to 100 F out and need both working. Furnace works on a 35amp plug in, just fine. Any one ever use one of these adapters?
Nope! A 50 amp RV plug has two 50 amp breakers, one on each leg. That's how you get 12,000 watts. 120 X 2 X 50 = 12,000

See here: http://www.myrv.us/Imgs/PDF/50-amp%20Service.pdf
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Old 11-04-2015, 02:03 PM   #21
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Nope! A 50 amp RV plug has two 50 amp breakers, one on each leg. That's how you get 12,000 watts. 120 X 2 X 50 = 12,000

See here: http://www.myrv.us/Imgs/PDF/50-amp%20Service.pdf
If this is the case then my 50 to 30 amp adapter cord is supplying my 30 amp trailer cord with 50 amps?????
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Old 11-04-2015, 04:14 PM   #22
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If this is the case then my 50 to 30 amp adapter cord is supplying my 30 amp trailer cord with 50 amps?????
50 amps is the maximum capacity for each leg of the circuit. By using reducer adapters, you can connect to equipment designed to carry less amperage.

Just as your house may have a main feed and circuit breaker rated at 200 amps, you attach appliances that "use" much less to your individual branch circuits.




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Old 11-04-2015, 10:17 PM   #23
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The 50 amp receptacle at the RV parks use either 2- 25 or 30 amp breakers. One for each 120v leg for side of the plug or circuit in the RV. I've noticed several times that a 5000-6000 watt gen using some kind of an adapter from both the 120 30amp outputs. Our Montana isn't pre wired for a onboard Gen set, but I need to have enough power on both 120 legs to run both AC's. We are out sometimes when its close to 100 F out and need both working. Furnace works on a 35amp plug in, just fine. Any one ever use one of these adapters?
When in camp grounds that only have 30 amp service I use a 30 amp to 50 amp dog bone and can run both AC's but nothing else. If we want to run the micro I put one of the AC's in fan only mode until finished. I think you would be much happier with this Honda then the Champion noise wise, cost more but much quieter and neighbor friendly. Have nothing against Champion, I have one of their 2000 watt inverter generators runs good starts on first pull every time.
Honda EU7000IS 5500 Watt Electric Start Portable Inverter Generator | eBay
This is the dog bone adapter I use, works fine to run both AC's on 30 amp service.
Amazon.com: Camco 55185 PowerGrip 30M/50F AMP 18" Dogbone Electrical Adapter with Handles 3750W/125V: Automotive
If what ever generator you end up with has a 30 amp 240V 4 conductor twist lock this 30 amp 4 prong twist lock to 50 amp RV plug will give you 120V on both legs
http://www.amazon.com/gp/product/B00...r_1_29&sr=8-29.
Also make sure your converter or inverter charger is not in boost or bulk mode when running both AC's.
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Old 11-04-2015, 10:26 PM   #24
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If this is the case then my 50 to 30 amp adapter cord is supplying my 30 amp trailer cord with 50 amps?????
When you use an adapter you are getting one 50 amp leg feeding into your 30 amp plug. But, since the trailer has a 30 amp breaker you will "blow" it before the cord or the pedestal breaker even notices.
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Old 11-06-2015, 09:09 AM   #25
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A similar need for 50 AMP RV generator

I was about to start a new thread when I saw this. I'm a neewbie, so, please bear with me.

So, some are saying to get a true 50 AMP service for my Heartland Big Country 3650RL, I will need at least a 12000 watt generator?

Is there a simple solution to our need for a 50 AMP service to run two air conditioners, power a residential size refrigerator, etc?

Do we need an inverter generator (pure sine wave), or a regular (modified sine wave) generator will do fine?

The recommendations I've seen so far seem to cover both types. So, does it not matter?

Anyone out there in a similar situation with a similar rig as me?

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Old 11-06-2015, 11:08 AM   #26
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So, some are saying to get a true 50 AMP service for my Heartland Big Country 3650RL, I will need at least a 12000 watt generator?



Is there a simple solution to our need for a 50 AMP service to run two air conditioners, power a residential size refrigerator, etc?

This is a difference between getting a generator capable of supplying the FULL capacity of a 50 amp power pedestal, and supplying just what you NEED.

Most luxury DP Motorhomes still only have diesel generators in the 7,500 - 10,000 watt range...and they mostly have power to spare.

To to find out how many amps your appliances use. Then calculate how many you NEED to run simultaneously, and which if you had to, could run at other times. Remember this is in a boondocking situation. For example, you may want to just run 2 air conditioners and your residential fridge simultaneously. On average each AC runs on about 12 amps(YMMV) and the fridge could be between 1 and 4 depending on variables. You could try plugging into a 30amp service and see if you can run what you want off that.....then you know a generator of about 4000-5000 watts might work. Startup currents exceed running amps, so the appliances would need to be turned on in a staggered manner, so they don't all draw their startup amps simultaneously.
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Old 11-06-2015, 11:58 AM   #27
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True 50 amps for an RV is 12,000 watts (50 amps X 120 volts X 2 (L1 and L2)), does Champion even have one that large?
Mr_D


What killowatt output generator is needed to produce 100A of 120VAC power?

As you say 50A for an RV is actually 100A....(50A from each of the 2 120V legs in "so called" 50A pedestal receptacle).

I too doubt that Champion makes a generator large enough to produce as much juice as an ordinary 50A campground pedestal receptacle can supply.

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Old 11-06-2015, 12:10 PM   #28
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100 amps times 120 volts = 12,000 watts. (12KW)


As already mentioned, with a little power management, 8 to 10KW should be more than enough.


My MH has an 8KW, and I have never been anywhere near short on power even with both A/C units running.
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