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Old 08-15-2022, 06:39 AM   #1
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Maxing out 200 Amp Main?

Slightly puzzled here... and probably thinking too much

So my property had a mobile home on a separate meter, I've repurposed that cement pad and meter for my Class A.

The panel has a 200 Amp main GE THQMV2200 so does that mean my max load would be 4 friends with 50 Amp RVs blasting AC?

Simple math 4 x 50 = 200. Or does it?

It is often said a 50 Amp double pole can provide 50 Amps on each leg. Most I've seen on the PowerWatchdog app is 30 to 35 on each leg.

Using the logic a 50 Amp double pole can provide max 50 per leg does that mean a 200 Amp main is also providing 200 max per leg or 800 total?
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Old 08-15-2022, 06:47 AM   #2
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It provides 200 amps at 240 volts.

It can have 4 120/240 branch circuits at 50 amps each. That gives you a grand total of 400 Amps at 120 volts, not 800 amps.

Theexperts will soon be here to explain how the 200 amp breaker won't support 200 amps but 4 RV will never be drawing exactly 50 amps each.
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Old 08-15-2022, 06:49 AM   #3
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As you note a typical RV with 50A power never actually pulls 50A from each leg. I bet two A/Cs, a microwave and an electric water heater all running at once will only pull a max of 35A and only on one leg as the A/Cs are usually on separate legs.

So figure 200/35 = 5 or maybe 6 RVs hooked up simultaneously. What are you trying to do, start an RV park?

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Old 08-15-2022, 06:51 AM   #4
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Quote:
Originally Posted by KenZ71 View Post
Slightly puzzled here... and probably thinking too much

So my property had a mobile home on a separate meter, I've repurposed that cement pad and meter for my Class A.

The panel has a 200 Amp main GE THQMV2200 so does that mean my max load would be 4 friends with 50 Amp RVs blasting AC?

Simple math 4 x 50 = 200. Or does it?

It is often said a 50 Amp double pole can provide 50 Amps on each leg. Most I've seen on the PowerWatchdog app is 30 to 35 on each leg.

Using the logic a 50 Amp double pole can provide max 50 per leg does that mean a 200 Amp main is also providing 200 max per leg or 800 total?
A 200 amp main is just that, 200 amps max based on it's recommended setup. In a house you rarely use all of that at once so there are many breakers within the panel that would total more then 200 amps. But the main breaker of that panel should be 4 50amp breakers in unison. So two coaches running 50 amp service, (50 amps per leg,) would be the max for your setup. Larger coaches can run close to the 50 amps per leg so why stretch it. Especially if you have other breakers in use as well. Just my opinion.
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Old 08-15-2022, 07:32 AM   #5
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Not looking to setup an RV Park but plan to setup to allow friends to visit. Say a pig roast with a few RVs - what is ideal setup given the 200 Amp main as the limiter?

DavidEM and Dutchstar411 have different opinions - that is what makes the world fun.

For now I'll go with a 2 x 50 and 1 x 30 then adjust as needed. Easy enough to run out to lowes for a couple more breakers and plugs or just tell visitors to boondock it 🤔😀

If anyone says consult a qualified electrician that is the trick. Can't find qualified "pros". We've all seen the posts where a pro sets up a plug that fries the RV

While renovating my home I had a couple pros tell me this box is safe. I kicked them out faster than you can say fire
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Old 08-15-2022, 07:38 AM   #6
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Quote:
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Not looking to setup an RV Park but plan to setup to allow friends to visit. Say a pig roast with a few RVs - what is ideal setup given the 200 Amp main as the limiter?

DavidEM and Dutchstar411 have different opinions - that is what makes the world fun.

For now I'll go with a 2 x 50 and 1 x 30 then adjust as needed. Easy enough to run out to lowes for a couple more breakers and plugs or just tell visitors to boondock it 🤔😀

If anyone says consult a qualified electrician that is the trick. Can't find qualified "pros". We've all seen the posts where a pro sets up a plug that fries the RV

While renovating my home I had a couple pros tell me this box is safe. I kicked them out faster than you can say fire
In theory, you could have 4 friends at 50 amp service, so adding 2 50's and 1 30 would be the bomb and very safe

As long as your wiring doesn't look like that picture you posted.
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Old 08-15-2022, 07:50 AM   #7
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Playing it safe is the way to go.



If i run everything in my coach I can pull about 70 amps. As long as your visitors have some common sense you should be fine. If you start having problems and your visitors don't want to conserve you may have to force them to use a 50 to 30 dog bone to limit amperage.
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Old 08-15-2022, 08:07 AM   #8
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Quote:
Originally Posted by KenZ71 View Post
Slightly puzzled here... and probably thinking too much...

so does that mean my max load would be 4 friends with 50 Amp RVs blasting AC...

Simple math ...

Or does it...

It is often said ...

Using the logic ...

does that mean ...?
I picked out a few phrases from your post to illustrate the basis for my suggestion to you: why not wire it in accordance with code? Why not give your AHJ a call to become familiar with local requirements? The NEC provides you the answers to your questions in terms of utilization factors to apply for multiple connections to a campground electrical circuit.

Kudos to you for asking good questions. Unfortunately, the use of what seems like common sense combined with a minimal understanding of how electricity works, compounded by uninformed but confident advice from somebody on an online forum, leads to expensive equipment damage and possible injury, not to mention disappointment and bewilderment. Good luck.
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Old 08-15-2022, 08:38 AM   #9
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Ken,

Hopefully, you can shop out your job by contacting a few electrical contractors and see what they suggest as to how THEY would build out your job based on your requirements. With their suggestions, you can decide on how you would proceed with your project.
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Old 08-15-2022, 08:52 AM   #10
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This will require installation of a 100 amp subpanel.
Two 50s in the main panel and two 50s in the subpanel.
OP's water pump, if he has one, stays on the main panel, along with any other outdoor lighting fixtures and such. Good luck!!
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Old 08-15-2022, 08:54 AM   #11
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In theory, you could have 4 friends at 50 amp service, so adding 2 50's and 1 30 would be the bomb and very safe

As long as your wiring doesn't look like that picture you posted.
Might as well add a second 30 amp service, on the opposite leg the first is on.

Four 50s, on their own breakers, would be fine. Of course they'd bring the installation cost up.
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Old 08-15-2022, 09:12 AM   #12
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While renovating my home I had a couple pros tell me this box is safe. I kicked them out faster than you can say fire
And please do tell us why you say this box is safe. Inquiring minds want to know.
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Old 08-15-2022, 09:17 AM   #13
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Quote:
Originally Posted by KenZ71 View Post

...So my property had a mobile home on a separate meter, I've repurposed that cement pad and meter for my Class A.
One thing not stated here is whether or not you replaced the mobile home with a permanent home. If you have or are planning to, does your electric company allow for 2 separate services on your property?

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Old 08-15-2022, 09:51 AM   #14
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The main breaker is, and should be, a 200A breaker, not 4, 50A breakers as mentioned previously.

Whatís ideal? It depends.

Downstream of the main breaker you could have 4, 50A breakers feeding 4, 14-50 outlets, 4, 30A breakers feeding 4, TT-30ís and a dozen 15A breakers feeding various circuits.

Will you be able to have 8 RVís running full tilt boogie and 12 air compressors running simultaneously? No.
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