![]() With the EVSEAdapters parts that they build now, they buy official Tesla adapter plugs that match the amps of what they are going to build for. Using half the voltage or double the voltage will not change the amps at all. It looks and acts like a real adapter to the UMC. The EVSE one does, because it includes the little chip from the original official Tesla part that they cannibalize to build theirs. You're right, that most of those simple ones from other places that are just wire remapping don't do that. You're usually very on top of this, so maybe this is a brain fart, but not much of this is making sense. It's kind of unnecessary risks since there is a better version of adapter available now. But those don't tell the car to proper current limit, so you would have to remember to manually dial it down, so I don't really recommend those. So you can find some of these kinds of adapters that are specifically marked for EV charging that wire it differently inside in an "improper" way to put the 120V and ground across those two hot1 and hot2 pins to make it work. An RV is only looking for 120V connections from either side to ground anyway, so that's fine-just less total amps to work with.īut an EV charging unit is trying to read a voltage difference across hot1 to hot2, and when they are hooked up to the same wire, there is 0V, so it just sits there doing nothing. So those pigtail adapters take the 120V hot line from a TT-30 outlet in the pedestal and put it on BOTH "hot1" and "hot2" of the 14-50 receptacle end. They just have a lot of 120V loads that they need to spread out across two different circuits, so they don't overload something. RVs are not actually trying to use 240V, which was a surprise to me when I learned it. It will automatically announce the appropriate 24A limit to the car too.Īny of these kinds of 14-50 to TT-30 adapter plugs you find in RV supply or camping supply places just will not work for electric car charging because they are wired the wrong way for what an EV points out the problem. We had to do workarounds and such years ago, but this is 2020 now, and you can just buy the perfect almost official looking TT-30 adapter from EVSEAdapters, and you're good to go. TT-30P to NEMA 14-50R Adapter for EV Charging at Campgrounds – EVSE Adapters So it might just work and be fairly safe. I think it will pull a full 20 Amp at 120V (I think). Wait, a "normal" 14-50 (50Amp) at half voltage might actually be ok. But they really should make it a 30 Amp Socket not 14-50, risky you pull to much load on the 30 Amp outlet. Won't be a huge difference between 20Amp 120V and 30Amp 120V anyway, both pretty slow. The RV 30 amp should be grounded fine and perfectly safe. He can certainly do is a 20Amp 120V UMC adapter. I don't think it cares about Voltage, it does care about voltage drops over time but I don't think it cares about absolute voltage across its "load". It might see that one hot "leg" is grounded though and barf. For more information on using, enjoying and maintaining your RV visit RV Education 101.I'm not sure, but if you feed 120V across the 30Amp UMC Plug it might run ok (that's all the 120V UMC adapters are doing). ![]() Mark’s favorite past times are RVing in their 35-foot Type A motorhome, and restoring vintage RVs, classic cars and trucks. Since that time RV Education 101 has helped educate millions of RV owners and RV enthusiasts on how to properly and safely use and maintain their RV. KOA’s resident RV expert, Mark Polk, and his wife Dawn started RV Education 101 in 1999. Want to learn more about living on 30 amps? Check out this video for tips for RV living on 30 amps. Conversely, if you use an adapter for a 50 amp RV, you’ll be limited to 3,600 watts.Even with an adapter, your 30 amp service RV won’t receive more power than the 3,600 watts it can handle.A 50 amp service RV provides a maximum 12,000 watts.A 50 amp plug has four prongs – two 120 volt hot wires, a neutral wire and a ground wire – that supply two separate 50 amp, 120 volt feeds.A 30 amp plug has three prongs – a 120 volt hot wire, a neutral wire and a ground wire – and is generally used on RVs with lower load requirements.Plugs on RVs with 30 amp service and 50 amp service differ in design. ![]() What’s the difference between a 30 amp and a 50 amp RV electrical system? In this handy RV how-to video, Mark Polk explains why you can use more electricity in an RV with a 50 amp service then you can in an RV with a 30 amp service. Learn everything you need to know about the difference in RV amperage from our resident RV expert in this video. ![]()
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