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RV adaptor recommendation

‘Merica

S85 and S100D
Jun 3, 2019
132
162
Las Vegas
Im planning a few long road trips in the S in the coming months, and Id like to bring along a couple of extra charging options for peace of mind in case we get into a jam with a non functional supercharger along the way.

I currently have the standard UMC with a standard plug, 14-50, and a J1772. I’ve seen a couple of RV campground adaptors on eBay, listed for EV use. Has anyone one used one of these or have a recommendation? I don’t mind paying extra for one that’s confirmed to be safe and effective.

Thanks!
 

gilscales

Banned
Jul 16, 2016
1,694
2,035
Long Beach, CA
I used this one at Little Creek Casino's RV park 2 days ago:
TT-30 Adapter for Tesla™ Model S™/X™/3™ Gen 2 – EVSE Adapters

It properly set the 24A limit in the car. I dropped the amperage down to 10A because I wanted to time an overnight 100% charge for ~6AM. No issues. Haven't tested at full 24A for extended time yet.
I bought this exact adapter for the "just in case" fringe usage, I have not tested it out yet, it looks like the RV park you mention has the 50A 14-50 outlets, is there a reason that you used the 30A 120v TT-30 instead? just trying to learn for any road trips I might be on.
 

brianman

Burrito Founder
Nov 10, 2011
17,610
3,207
I bought this exact adapter for the "just in case" fringe usage, I have not tested it out yet, it looks like the RV park you mention has the 50A 14-50 outlets, is there a reason that you used the 30A 120v TT-30 instead? just trying to learn for any road trips I might be on.
I rented out a spot for the 14-50, but only needed a little for overnight and the spot had both receptacles present and hot. I was expecting some fellow Tesla owners to stay at the Casino as well (we were meeting at The Ridge Motorsports Park on Saturday), and wanted to leave the 14-50 open to share the spot.

For future events, it's good to know that at least some of the spots (I didn't check them all) will be useful for 2 cars as long as you can swap the cords around partway through the night or one of the cars doesn't need as much charge.
 
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Reactions: gilscales

bpjod

Supporting Member
Supporting Member
Nov 5, 2016
500
2,707
Alberta, Canada
In Canada and US campsites offer 30 Amp service and 50 Amp service.

The 30 Amp service is 120 Volt and uses a TT-30 connector. At 24 Amps (max draw) you'll get 2.88 kW charge rate.

The 50 Amp service is 240 Volts and uses Tesla's NEMA 14-50 connector. With the UMC Gen 1 you can draw 40 Amps for 9.6 kW an with the Gen 2 UMC that drops down to 32 Amps for 7.68 kW.

An 8 hour overnight charge yields:
30A: 23 kWh added = 27% of 85 kWh battery
50A (Gen 1): 77 kWh added = 90% of 85 kWh battery
50A (Gen 2): 61 kWh added = 72% of 85 kWh battery

In my experience, almost every campground that offers electrical hookups will have 30 Amp service, but many won't have 50 Amp service. 50 Amp service is for the large trailers and motorhomes -- typically those with two A/C units. In a campground with 30A sites and 50A sites to choose from, the 30A serviced sites are typically cheaper. Furthermore most 50A sites are fully serviced with sewer and water hookups, but many campgrounds have 30A sites that are fully serviced and also sites that just have electrical. These are even cheaper.

After considering all of the above, 50A is best for charging, but having a TT-30 adapter is great if you would rather save a little money when you don't need that much charge and also will allow you to charge up at more campgrounds. It's a nice option to have. Here's the adapter I use and it works great. Just remember to dial back the charge rate on the car to 24A or less!
 

‘Merica

S85 and S100D
Jun 3, 2019
132
162
Las Vegas
35014932-5228-4927-B0F9-C7EC158D544E.jpeg
 

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