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ElectricVehicle
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Re: Adapters for Ingineer's L1 to L2 EVSE mod NOW AVAILABLE

Mon Apr 25, 2011 11:30 am

Progressive Industries ADT-230 Cheater Box Retail: $79.00
Features:
The Cheater Box plugs into and 30amp and a 20amp source on separate circuits to give user a 50amp output.
Will not operate on a GFCI circuit.
Designed for outdoor use.
Their "features" description is a little misleading, as it combines two single 120V circuits to give a 120/240V circuit.
The amperage at 240V is limited by the lowest amperage of the source 120V circuits. It's a NEMA 14-50R 50 Amp receptacle, rated for 50 Amps but it's connected to sources that supply less than 50 Amps. So it's a 50 Amp receptacle on effectively a 30, 20 or 15 Amp circuit depending on the source circuits you plug it in to.

This image shows the source plugs which helps to understand this little box better:
Image

This Google search on part number "230-ADTP30" digs up more suppliers and a few reviews.
Here's yet another nice diagram of the NEMA configurations: http://www.nooutage.com/nema_configurations.htm
Stay On Line's reference center: http://www.stayonline.com/reference-home.aspx
NEMA Straight Blade: http://www.stayonline.com/reference-nem ... blade.aspx
NEMA Locking: http://www.stayonline.com/reference-nema-locking.aspx
Last edited by ElectricVehicle on Mon Apr 25, 2011 5:17 pm, edited 2 times in total.
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davewill
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Re: Adapters for Ingineer's L1 to L2 EVSE mod NOW AVAILABLE

Mon Apr 25, 2011 12:39 pm

garygid wrote:The 50-amp "cheater" (2 posts above) is advertized as providing 50-amps when plugged into a 30-amp (120v) and 20-amp (120v) socket. However, I suspect it provides 208v or 240v, and only 20 amps maximum.

If plugged into two different phase TT-30 sockets, it would be 30 amps maximum.

I have two TT-30P to 5-15R adapter "cubes" (about $6 each), and a 2x 5-15P to L6-20R "Y" adapter (about $16 in parts) to get the 240v (or maybe 208v) for my Mod-L1 EVSE.
You're correct, 240/208v at 20a. But I don’t think the RVs use it that way. They simply connect some of their 120v plugs to one side and some to the other. So one circuit has 120v 20a and the other has 120v 30a.
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Re: Adapters for Ingineer's L1 to L2 EVSE mod NOW AVAILABLE

Mon Apr 25, 2011 3:03 pm

I think the reason it's called a 50amp cheater is that even RV'ers don't know enough technical detail, and simply expect a NEMA14-50R (receptacle), which they refer to as "50 amp service". The actual amperage supplied is of less importance to them than the compatibility with the plug they use.
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TEG
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Re: Adapters for Ingineer's L1 to L2 EVSE mod NOW AVAILABLE

Mon Apr 25, 2011 3:22 pm

Yes, RVer terminology is a bit weird. If they can plug a 20amp air-conditioner into one (120V) leg, and a 30amp air-conditioner into the other 120V leg then they call it "50 amp service" (20+30). I think a typical RV may only have 120V appliances, and even though they use a NEMA14-50 240V plug/socket it is really just a way to get two feeds of 120V.

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ElectricVehicle
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Re: Adapters for Ingineer's L1 to L2 EVSE mod NOW AVAILABLE

Mon Apr 25, 2011 3:51 pm

TEG wrote:Yes, RVer terminology is a bit weird. If they can plug a 20amp air-conditioner into one (120V) leg, and a 30amp air-conditioner into the other 120V leg then they call it "50 amp service" (20+30). I think a typical RV may only have 120V appliances, and even though they use a NEMA14-50 240V plug/socket it is really just a way to get two feeds of 120V.
That's not correct as I understand it. NEMA 14-50 is a 120/240V circuit that is rated at up to 50A for 120V or 240V applications. If you nave an electric barbeque pit (mythical) that used 240V at 40 Amps (Can only use 80% of circuit rating for a continuous load, per NEC), you can plug it in to a NEMA 14-50 on a 120/240V 50 Amp circuit.

Thr trailer park may ask you to draw less current than the NEMA 14-50R receptacle is rated for if they have it on a smaller circuit, the power is shared etc. NEMA 14-50R is often used on 40A circuits since there isn't a NEMA 40 Amp configuration. For 6.6 kW charging, you'd use a NEMA 14-50 on a 40 Amp circuit and the charger draws about 30 Amps continuously. When we have 6.6 kW charging for hte LEAF in future generations (some other EVs have it now), there's a big difference in charge time between a NEMA 14-50R on 20 Amps, vs 40 or 50 Amps.
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garygid
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Re: Adapters for Ingineer's L1 to L2 EVSE mod NOW AVAILABLE

Mon Apr 25, 2011 10:25 pm

Roughly $66 + $10 shipping at tweetys.com
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Re: Adapters for Ingineer's L1 to L2 EVSE mod NOW AVAILABLE

Mon Apr 25, 2011 11:47 pm

ElectricVehicle wrote:
TEG wrote:Yes, RVer terminology is a bit weird. If they can plug a 20amp air-conditioner into one (120V) leg, and a 30amp air-conditioner into the other 120V leg then they call it "50 amp service" (20+30). I think a typical RV may only have 120V appliances, and even though they use a NEMA14-50 240V plug/socket it is really just a way to get two feeds of 120V.
That's not correct as I understand it. NEMA 14-50 is a 120/240V circuit that is rated at up to 50A for 120V or 240V applications.
I think the RVers use the 14-50 plug/socket in ways that aren't typical.
For instance, check out the "Dogbone" adapters:
http://www.google.com/products/catalog? ... CDEQ8wIwAg#
Image
The way they state it you get "50 amp service from a 30 amp plug".
The RV terminology just seems to be "50 amp" means NEMA14-50, but they may only have one 120V leg active on the 14-50, and it may be fed by a 30 amp breaker on the other end.
Basically what I am saying is that when you see a cord with a NEMA14-50 on the end at a campground, don't assume it has 50amps of 240V available.

---

http://www.rvtravel.com/publish/120-Vol ... tems.shtml
...Campground hook-ups often have three receptacles: 20, 30 and 50 amps.
...This is because the 50-amp receptacle actually conducts two 120-volt circuits in order to supply the 50 amps that big rigs need.
In effect, it is a 240-volt receptacle, like those used for electric clothes dryers in a house.
RVs with two air conditioners need the 50-amp circuit in order to run both air conditioners at the same time, because each air conditioner runs on a separate 120-volt circuit.
...Adapters are available that will allow you to hook up your RV to any campground receptacle regardless of what type of plug is on the RV power cord. Of course, you are limited to the available amperage at the receptacle. A 20-amp receptacle will limit the number of appliances that can be run at the same time and may not be sufficient to run an air conditioner. An RV that has a 50-amp plug may find that only one air conditioner will operate if plugged into a 30-amp receptacle.
If your RV is connected to a receptacle that is higher than what is required (for example, when a 30-amp power cord with an adapter is plugged into a 50-amp receptacle), you must limit your electrical usage to 30 amps at any one time. Even though 50 amps are available, the main circuit breaker will trip if the RV is pulling more than 30 amps...

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Re: Adapters for Ingineer's L1 to L2 EVSE mod NOW AVAILABLE

Tue May 31, 2011 3:24 pm

I'm not sure what the primary applications for the NEMA 6-20 are, but I made an adapter for it and as the Brits say, "works a treat".

Image

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Re: Adapters for Ingineer's L1 to L2 EVSE mod NOW AVAILABLE

Sat Jun 11, 2011 7:10 pm

z0ner wrote:I'm not sure what the primary applications for the NEMA 6-20 are, but I made an adapter for it and as the Brits say, "works a treat".

Image
At the train station in Hamilton NJ they have 5 EV parking spots: 4 are 5-20R 120V but 1 is 6-20R 240V.

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Re: Adapters for Ingineer's L1 to L2 EVSE mod NOW AVAILABLE

Sun Jun 12, 2011 6:30 am

z0ner wrote:I'm not sure what the primary applications for the NEMA 6-20 are, but I made an adapter for it and as the Brits say, "works a treat".
The (not yet released) Leviton Evr-Green chargers have a NEMA 6-20 plug. That's why I had to rig a 2-stage adapter:
1) modified 10-30 dryer cable plug to 6-20r (for the Leviton)
2) molded 6-20p to L6-20r adapter (for the modified L2 EVSE)

I'll probably start off with the Nissan EVSE until Leviton (or someone else) starts selling a wall-mount EVSE at a reasonable price (like less than the AE unit). They certainly don't make it easy!
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