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Thread: 30 Vs 50 Amp
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06-12-2022, 04:57 AM #11
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Thank you. This makes sense. I set up a plug at home to keep the RV plugged in, and only ran a 10-2 wire, assuming that I could leave one leg void of power. I had read that a 4-3 adapter, like the one we can use in a campground when only 30 amp single phase is available, simply drops one of the hot legs. I was wrong. The adapter clearly does more than just drop a leg. I reran 10-3 with 2 hot legs and bingo, everything works fine now.
As I said earlier I know just enough to get myself in trouble. But your response does clear a lot of this up. And yes, when I look at the plug, it is obvious that the ground in on the outside of the connector. Thank you2015 F350 King Ranch
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06-12-2022, 06:34 AM #122023 Momentum 398M-R
2023 Ford F-450
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06-12-2022, 06:54 AM #13
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On standard North American split-phase 120/240 service, the legs are 180 degrees out of phase which means the average neutral current is 0 if both legs are equally loaded. Maximum neutral current is 50A in an RV circuit if one leg is fully loaded and the other has no load.
Phases 120 degrees apart is what you see on 3 phase service where the typical non-industrial service is 208V line to line and 120V line to neutral. You have the same neutral average current being zero with the phases having zero load.John & Kathy
2014 F250 Lariat FX4 6.2L SBCC
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06-12-2022, 08:18 AM #14
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2015 F350 King Ranch
2021 Reflection 260RD 5th Wheel
From the Green Mountain State
(but spends as much time in the Sunshine State as possible)
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06-12-2022, 08:39 AM #15
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If I'm not running the AC, I just use a large extension cord from a wall plug with the correct adapter at the 5W. Fridge works fine along with other items except the microwave...
My solar keeps the batts fully charged.Dan and Rita
2021 Reflection150 260RD, built June 2020, w/400W solar + 2 size 31 AGMs, added 2" lift blocks to match the
2022 F350 SCSB 7.3 GdZa 4x4, 10 Sp w/4.30s - Lariat Sport in Atlas Blue
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06-12-2022, 03:58 PM #16
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What breaker did you hook this new 10AWG up to? Hopefully it was a 2-pole 30A CB. So are you saying that you wired it from the panel to a receptacle rated 50A 250V? If so then you're still only going to have 30A available on each leg, not 50A. Keep in mind that with a 30A 120V power supply you have a max of 3600 Watts available for use. 30A x 120V = 3600W.
On a 50A 120/240V power supply you have
50A x 120V = 6000W
+ 50A x 120V = 6000W for a total of 12,000 Watts available to use.Bill & Colleen ~ Schwenksville, Pa
2019 Reflection 337RLS
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06-12-2022, 06:56 PM #17
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Yes, 2 pole breaker, 30 amps with 10 gauge wire, 2 hot legs, a neutral and a ground. Yes, the camper is rated at 50 amps, but in my wildest dreams I cannot imagine using that much juice for a few lights and to charge the battery in my driveway. If I ever do, I assume the 30 amp breaker in my garage will trip and I'll know it. (We camped this past weekend and only had a 30 amp single pole service, ran the AC, fridge, lights etc and had no issues). I'm also assuming the camper is rated at 50 amps in case I decide to add a 2nd AC unit. Everything is pre-wired and the hole is even cut. This way you can just add the 2nd AC unit and not have to rewire the entire thing. But that is just my guess....
2015 F350 King Ranch
2021 Reflection 260RD 5th Wheel
From the Green Mountain State
(but spends as much time in the Sunshine State as possible)
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06-13-2022, 03:46 PM #18
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You are probably correct about the 2nd AC wiring being installed... everything should be done if it was included in your package. I know when Grand Design preps for a future second AC unit they frame the opening, run the wire from the CB to the ceiling, and the T-stat wire down inside the wall by the bedroom light switch. You will be fine with the power setup you have at your driveway...I always keep my RV plugged into a standard 30A 120V RV receptacle while at home. Fridge stays on, battery is charged, and AC is used from time to time. With your setup it depends on what RV appliances are on each "30A hot leg" in the RV to determine what you can and can't run simultaneously. You could possibly run an AC unit, water heater, together along with the fridge, the converter and other items in your RV. Enjoy your RV!
Bill & Colleen ~ Schwenksville, Pa
2019 Reflection 337RLS
2006 GMC Sierra 3500 8.1L V-8
Firestone Ride-Rite Air Bags
Front Stabilizer Bar
Rear Anti Sway Bar
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06-14-2022, 08:45 AM #19
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When at our home I run my 50 amp rv on my 30 amp 4-wire dryer outlet with an adaptor that connects the 2 hots, neutral and ground properly. I can run both AC units since they are connected to opposite legs. I monitor current on each leg with our EMS and I never exceed 24 amps on either leg.
Be careful using some adaptors that are designed for Teslas because they don’t connect either the ground or neutral.
Here are 2 that claim all 4 wires are connected
https://www.amazon.com/CircleCord-Ch...dp/B08XNX8KQ6/
https://www.amazon.com/Rophor-Charge...dp/B09SHXVGBY/Jerry & Linda
Emma & Abby our Mini Golden Doodles & JR our Amazon Parrot
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07-03-2022, 07:13 AM #20
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Found this thread while seeking info on 30 vs 50 amp...we are currently camping and are having power issues with the 50 amp connection at our site. EMS kicking out regularly. Showing as low as 98 volts on one leg at one point. So I adapted to 30 amp and plugged into that. Worked ok Friday, then voltage dropped and EMS started kicking out. Campground maintenance comes out and their solution is to plug into my neighbors's pedestal on 30 amp (neighbor is using 50 amp) and they would do a permanent fix after the holiday weekend (we're here for the month). Worked for several hours then voltage dropped again and EMS kicking out. Problem lets up in the evening through early morning then voltage drops again. Called maintenance again yesterday and, well, they never showed up.
My panel looks as thought half of the trailer is on one leg and half on the other. The 50 amp breaker is in the middle and there are breakers above and below it, but there are 2 breakers for the fridge...one on one side and one on the other. Soooo, my question is, when I am working on 30 amp using an adapter, how does this power those two sides? Am I limited to 15 amps per side? My EMS shows draw on both legs occasionally while on this 30 amp setup.
Thanks in advance for taking time out of your holiday weekend!Jeff & Sherry
2020 Imagine 2670MK
2019 F150 SCrew, Eco, 4x4,
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Channging Battery Type?
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