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RV connection to marine plug

We're in Anacortes, WA for the summer and need somewhere to store our coach.  One available space is in a boat storage lot and the power source has a 30amp marine plug (see attached).  I can find an adapter on Amazon that will yield a 15amp connection (see attached), but not a 30.  Has anyone found a commercially available 30amp adapter? 

Thanks in advance,

George
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George Hatfield

  Never ever use World Line Motors of Nacogdoches for service!

Re: 30amp rv connection to 30amp marine plug

Reply #1 –
George,

No first hand experience with this one: Power Grip Generator Plug Adapter for RV Power Cord - 30 Amps - 3 Prong...

I don't know if a 30 amp generator twist lock is exactly the same as a 30 amp marine.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: 30amp rv connection to 30amp marine plug

Reply #2 –
Not sure about the 'marine adapter' either;  whether it's the same as our RVs. Progressive makes a 50 to 30 adapter that we use.
1993 U-240 "La Villa Grande"..CAT 3116 w/ Pacbrake PRXB...Allison 3060 6-speed..
Previous: 1983 Airstream 310 turbo diesel, 1979 Airstream 280 turbo diesel
                                      Build # 4297
                                      PNW natives
                      Home base:  'Cactus Hug' (Ajo, Arizona)
                        DW Judy & Chet the wonder dog
                        Full-Timers 'Sailing the asphalt sea'

Re: 30amp rv connection to 30amp marine plug

Reply #3 –
Notice the configuration of the marine female plug.  One leg has a "L" connector which is meant to secure the plug since a boat can move around a bit at the dock while plugged in.  Brett may be on to something in using a generator plug for it.  I will check with the yard and see what they have to say. 

George
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George Hatfield

  Never ever use World Line Motors of Nacogdoches for service!

Re: 30amp rv connection to 30amp marine plug

Reply #4 –
The marine is twist lock receptacle.  Looks like the nema is L5-30  That says what the volt, amp and configuration is.    Once you have that nema number you can mix and match with adapters.  The L5-30 is the standard 30A  120V 3 wire twist lock
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: 30amp rv connection to 30amp marine plug

Reply #5 –

Found one.  I went down to the parking lot where we plan to keep he FT and talked to a guy that had a commercially produced adaptor.  He got it on Amazon. 

Amazon.com: Parkworld 886399 Shore Power to RV & EV 50A Adapter Power Cord...

Problem solved. 

Thanks for the input.

George

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.
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George Hatfield

  Never ever use World Line Motors of Nacogdoches for service!

Re: 30amp rv connection to 30amp marine plug

Reply #6 –
George, your link is to a 50-amp adapter.

Re: 30amp rv connection to 30amp marine plug

Reply #7 –
Barry...  Sorry, we ended up with a 50amp site for the coach.  The place has both 30 and 50 amp sites.

George
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George Hatfield

  Never ever use World Line Motors of Nacogdoches for service!

Re: 30amp rv connection to 30amp marine plug

Reply #8 –
Quote from: George Hatfield –
Barry...  Sorry, we ended up with a 50amp site for the coach.  The place has both 30 and 50 amp sites.
I'm going to assume you have a EMS hooked-up.  ^.^d
1993 U-240 "La Villa Grande"..CAT 3116 w/ Pacbrake PRXB...Allison 3060 6-speed..
Previous: 1983 Airstream 310 turbo diesel, 1979 Airstream 280 turbo diesel
                                      Build # 4297
                                      PNW natives
                      Home base:  'Cactus Hug' (Ajo, Arizona)
                        DW Judy & Chet the wonder dog
                        Full-Timers 'Sailing the asphalt sea'

Re: 30amp rv connection to 30amp marine plug

Reply #9 –
Quote from: mike leary –
I'm going to assume you have a EMS hooked-up.  ^.^d

OR, have checked at the female end of the adapter with a voltmeter:

Outer straight to outer straight= 240 VAC
Either outer straight to center straight or center round= 120 VAC
Center straight to center round= 0 VAC

If these aren't your readings, let us know what you find.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: 30amp rv connection to 30amp marine plug

Reply #10 –
Mike...  always have one inline.  See attached.
 
George
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George Hatfield

  Never ever use World Line Motors of Nacogdoches for service!

Re: 30amp rv connection to 30amp marine plug

Reply #11 –
Quote from: George Hatfield –
Mike...  always have one inline. 
I don't know that brand, here's what Progressive has to say:
1993 U-240 "La Villa Grande"..CAT 3116 w/ Pacbrake PRXB...Allison 3060 6-speed..
Previous: 1983 Airstream 310 turbo diesel, 1979 Airstream 280 turbo diesel
                                      Build # 4297
                                      PNW natives
                      Home base:  'Cactus Hug' (Ajo, Arizona)
                        DW Judy & Chet the wonder dog
                        Full-Timers 'Sailing the asphalt sea'

Re: 30amp rv connection to 30amp marine plug

Reply #12 –
Brett...  Good idea.  I contacted the company that makes the adapter and they sent me the attached wiring diagram.  Looks OK to me.  But I will check.  There are three other coaches with this adaptor at the storage site.  Also, I have a friend here in Anacortes that is an electrician.  I will have him check it!

George
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George Hatfield

  Never ever use World Line Motors of Nacogdoches for service!

Re: 30amp rv connection to 30amp marine plug

Reply #13 –
Receptacle posted in first picture  is not the same as the adapter 

In a 30 amp 120v  to 50 amp adapter  if you test between the outer blades voltage will be 0 zero since they will be the same phase
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: 30amp rv connection to 30amp marine plug

Reply #14 –
Quote from: turbojack –
In a 30 amp 120v  to 50 amp adapter  if you test between the outer blades voltage will be 0 zero since they will be the same phase

That works well with our motorhomes since they have no true 240 V circuits--just two seperate 120 V 50 A circuits.
David and Carolyn Osborn
1995 U320C SE 40' Build 4726 Feb 1995
FMCA 147762
Motorcade 17186

Re: RV connection to marine plug

Reply #15 –
Yes, there are two different marine 50 amp services-- and the prong configuration is DIFFERENT.  One is 50/125, the other 50/125/250.  Either will work for George's needs as even the "lessor one", the 50/125 will give 50 amps @125 VAC..  The 240 one is similar to our RV 50 amp service= TWO 50 amps hots @ 125 VAC.

On the sailboat, we carry both styles of adapters.

Scroll down to"Shore Power Cords"  see the box on the right showing the different marine configurations.

DIY Shore Power | West Marine
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020
 

Re: RV connection to marine plug

Reply #16 –
Finally in storage.  The "slip" is not quite level, but not too bad.  Turned off the HWH, refrigerator (residential), the inverter, and the salesman's switch.  Anything else to turn off when stored with no power?  The plug adaptor will not be here until next week.  I'll check on the coach frequently.  Might even turn the "auto" on for the generator.

George

Update 6/5/19...  The 50/50 amp adapter (see above) arrived and worked perfectly.  Checked the voltages and they are as expected.  Surge Guard did not object. 
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George Hatfield

  Never ever use World Line Motors of Nacogdoches for service!