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Thread: Charging at Campgrounds and RV Parks

  1. #11
    mod squad TEG's Avatar
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    Quote Originally Posted by ToddLa View Post
    an adapter like this....
    A smaller version of the same adapter can be found here: 30 Amp Male / 15 Amp Female Adapter
    (To let you plug an MC120 into one of those RV park TT-30 sockets.)
    Last edited by TEG; 2011-06-04 at 12:02 AM.

  2. #12
    mod squad TEG's Avatar
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    Quote Originally Posted by ToddLa View Post
    RV parks have two common power hookups
    30a/110v NEMA TT-30 plug, or "30amp" for short.
    50a/220v NEMA 14-50 plug, or just "50amp" for short.
    Again from the Wikipedia NEMA link:
    NEMA TT–30 is a 30 A, 125 V recreational vehicle standard which may also be known as RV 30. It is frequently (and sometimes disastrously) confused for a NEMA 10–30.
    Note, Martin's kit shows:
    NEMA
    10-30 208V-240V 30A
    So I gather you could cause a problem if you plugged that into a campground TT-30 by mistake.

    From Wikipedia:
    NEMA 10-30:

    NEMA TT-30:


    Apparently they are slightly different sizes, but close enough that you can jam one into the other if you feel determined.

    Another quote from Wikipedia:
    Due to the appearance of this plug, many people assume that it is to be wired for 240 V, but this is a 120 V device.
    ---

    Is the following mis-information?:
    Burning Man Power Grids with Big Generators
    ...Rarely on playa do people need 240v. RVs do not use 240v even though their plugs remind you of dryer plugs. ...
    ...Big RVs with two ACs have a special 50 amp plug. These are rare and probably not worth supporting in your grid. They do it using two phases, and even have adapters to let them plug into two TT-30s at once. They do not try to get 240v...
    The above suggests that some RVs use 50 amp 120V service... I thought all the 50amp sockets were 240v not 120v... Is there such as thing as a TT-50?

    What about something like this?:


    It appears to let you plug a NEMA14-50 into a TT-30?!
    Danger will Robinson? It sounds like there are plenty of adapters that let you plug 240V equipment into a 120V RV outlet. Also to plug something meant to draw 50 amps from a socket designed to provide only 30. It sounds like you better know your volts & amps clearly (both source and destination) before you start playing with RV adapters!
    Last edited by TEG; 2009-06-03 at 04:31 PM.

  3. #13
    mod squad TEG's Avatar
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    Yet another adapter that lets you plug NEMA14-50 equipment into TT-30s:


    This RV adapter includes a 30 amp RV plug (TT-30) and a 24" piece of 10/3 cord that connects to a box with a 50 amp 125/250 volt NEMA 1450 receptacle. Made with UL Listed components.

    So, is the idea that some RVs use NEMA14-50 to get 125V@30amps?


    The description of this and other boxes seem to imply that you can magically turn a 30amp@120V socket into a 50amp@240V socket...

  4. #14
    mod squad TEG's Avatar
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    More campground fun:

    CHEATER BOX
    The Cheater box plugs into a 120-volt/30-amp and a 120-volt/20-amp source on separate circuits to give the user a 240-volt/50-amp output. This adapter will not operate on a GFCI circuit.
    Progressive Industries Cheater Box 50 AMP
    Last edited by TEG; 2009-06-03 at 04:54 PM.

  5. #15
    mod squad TEG's Avatar
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    CHEATER BOX
    The Cheater box plugs into a 120-volt/30-amp and a 120-volt/20-amp source on separate circuits to give the user a 240-volt/50-amp output. This adapter will not operate on a GFCI circuit.
    From here:
    The biggest problem with these devices is... THEY DO NOT WORK

    Unless you happen to be in a very very old park, most all parks today comply with the National Electric Code and of course local codes. these codes require the 15/20 amp outlet be protected by a GFCI. The "Cheater box" will trip a GFCI 100% of the time, every time, no exceptions as soon as you plug in the 2nd plug the GFCI trips

    The only way they work is if you are in a campground that, due to less than 50% occupancy during part of the year, lets you plug into two sites

  6. #16
    ERIC VFX vfx's Avatar
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    The Cheater box plugs into a 120-volt/30-amp and a 120-volt/20-amp source on separate circuits to give the user a 240-volt/50-amp output. This adapter will not operate on a GFCI circuit.
    I was under the impression that amperage would be the lessor of the two.

  7. #17
    mod squad TEG's Avatar
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    Quote Originally Posted by vfx View Post
    I was under the impression that amperage would be the lessor of the two.
    Me too... I think 'creative marking' has run amok there.

  8. #18
    mod squad TEG's Avatar
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    Quote Originally Posted by TEG View Post
    Thanks for that!, but why does it matter if they have 30amp or 50amp hook-ups? It looks like you are using a MC240, so I thought you would be limited to pulling <30amps regardless.
    Moderator's note: Ongoing discussion about plug standards etc has been moved to the Charging the Roadster thread. Let's keep this one for the road trip stories.
    By the way, my question got answered. The campground 30 amp connections are apparently 120V not 240V. So using a TT-30 adapter one would have to use the MC120@12 or 16amps, not the MC240 at 24amps+. So, yes, a Tesla with an MC240 visiting campgrounds really wants to find the sites that have so-called "50 amp" service.
    Last edited by TEG; 2009-06-05 at 08:51 PM.

  9. #19
    Roadster#433, Model S#S37 Cottonwood's Avatar
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    Quote Originally Posted by TEG View Post
    By the way, my question got answered. The campground 30 amp connections are apparently 120V not 240V. So using a TT-30 adapter one would have to use the MC120@12 or 16amps, not the MC240 at 24amps+. So, yes, a Tesla with an MC240 visiting campgrounds really wants to find the sites that have so-called "50 amp" service. (Any additional responses should/will go to the charging thread)
    That is a fact that is not explained many places. It is very important to know that in the RV world, 50 Amp service is 240 Volts at 50 Amps from the NEMA 14-50 receptacle that you can plug an MC240 into. On the other hand 30 Amp service is 120 Volts at 30 Amps from a TT-30 receptacle.

    Also, I have been looking at 14-50 installs in many home sites, RV connections in homes and oven/range installs. Many times the circuit breaker is 40 Amps. If you use an 80% derating for one of these, then you get 32 Amps which is just right for an MC240.

    See RV Electric for more details.

    The bottom line is that if you want to use an RV Park with an MC240, look for 50 Amp service.

  10. #20
    mod squad TEG's Avatar
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    Campground charging

    (This is North America centric for now)

    Although there is already a Charging the Roadster topic that covers some of it, I thought it would be helpful to have a topic specifically dedicated to the particular situation found with campground power hook ups.


    The two most common sockets to find at North American campgrounds are the NEMA TT-30 ("30 amp 120V 'Travel Trailer' socket") and the NEMA 14-50 ("50 amp RV socket").

    NEMA TT-30 plug & socket:


    NEMA 14-50 socket:

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