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Marine Shore Power Connector

GOPJEW

Member
Jul 5, 2015
571
255
Potomac, MD
So, I need to go visit my "in-laws" and, considering they are in Erie, PA which does not have a Supercharger...yet...I am thinking the best place for me to get a quality charge is off of the marine shore power at their marina.

I have been trying to find the proper adapter and have had little luck.

I think the proper shore power connector is an L5-30P for the 30 Amp terminals which is what their marina offers (there are a few 50 amp ones but they are at the far end of the dock and that would be 100's of feet of extension cords).

Does anyone know if this is correct? before I order one and build a connector I want to make sure.

Thanks.
 

linkster

Active Member
Apr 22, 2013
1,128
267
USAX2
Might you consider assembling a kit/adapter(s) that can charge on your in-laws (or anyone's) dryer receptacle (10-30 pre '96 construction, 14-XX '97 and later) that has a higher probability of re-use over a 120V marina receptacle/adapter such as the one shown below that charges at 288 miles/day, is light weight, uses a 12AWG 50' un-adulterated 5-20 terminated extension for both 120 and 240V charging and requires no manual amp adjustment?
image.jpg


please keep in in mind that the use of any home made/3rd party adapter is NOT recommended by Tesla and carries tremendous risk
 

Lanny

~
Nov 29, 2011
938
1,665
MD
Linkster,

Do those adapters take NEMA 10-30 and 14-50 and plug them into a NEMA 5-20, 12AWG 50' extension cable to carry 240v to the UMC? If so, how many Amps? I could use a kit like this.

Thanks,

Lanny
 

Cosmacelf

Well-Known Member
Mar 6, 2013
8,425
20,096
San Diego
Careful guys, there are two common marine shore power connectors. The OP asked specifically about one that looked like an L5-30, which delivers 120V at 30A. In particular he said he couldn't reach the 50A receptacles (which are typically 240V at 50A). So the other thread posted here (Need Help Using Marine Power Receptacle) isn't relevant to the OP since that one shows an adapter for a 50A connection.

Here is the adapter you can use to plug into the marine 30A connection: L5-30P to 14-50R EV Adapter, 30A, 125V | EVSE Adapter Cord

It converts the 120V/30A connection to a NEMA 14-50, for which you can use your Tesla 14-50 adapter, dial down the amps to 24A, and charge away. This should give you about 9 miles of charge per hour of charging (since it is only 120V).
 

GOPJEW

Member
Jul 5, 2015
571
255
Potomac, MD
Might you consider assembling a kit/adapter(s) that can charge on your in-laws (or anyone's) dryer receptacle (10-30 pre '96 construction, 14-XX '97 and later) that has a higher probability of re-use over a 120V marina receptacle/adapter such as the one shown below that charges at 288 miles/day, is light weight, uses a 12AWG 50' un-adulterated 5-20 terminated extension for both 120 and 240V charging and requires no manual amp adjustment?
View attachment 89859

please keep in in mind that the use of any home made/3rd party adapter is NOT recommended by Tesla and carries tremendous risk

Thanks for the idea Linkster but 12 AWG maxes out (under reccomendation) at 20 amps - too low for my concerns - I'd rather have a 6AWG that i know can carry the heavier loads when I can access them and just have too much for those other times (erroring on the side of having access versus not).

Unfortunately, my in-laws' dryer is in their basement so - otherwise that would've been my first option.

Thank you Cosmacelf for the referral - it looks like I was right that the L5-30 is the marina plug - that was my big concern. I know I won't get a lot out of it, but if I spend the night at the marina at least I can get a good charge since! I wonder if there is a way to pig-tail two-into one 14-50 in order to get 240v....hmmmm....business opportunity.

Thank you everyone for the help!
 

Cosmacelf

Well-Known Member
Mar 6, 2013
8,425
20,096
San Diego
No, do not pigtail two 120v into a 240v. Assuming you found two 120v connections that were out of phase, you would run into a shock hazard. You plug everything together and all works well, charging the car. You then go to unplug one of the 120v plugs. A circuit is created through the car and now you have 120v on the pins of the 120v plug you just unplugged. Zap!

There is a way to combine 120v circuits safely, but it requires an active box with relays. I built one, isn't too hard to do, but requires a bit more knowledge.

Also, when was your car built? I have no definitive info on this still, but it seems that cars built prior to about January 2014 are limited when charging from 120V sources to 20A. Cars built after January 2014 can draw a full 24A at 120V.
 

FlasherZ

Sig Model S + Sig Model X + Model 3 Resv
Jun 21, 2012
7,024
1,013
There is a way to combine 120v circuits safely, but it requires an active box with relays. I built one, isn't too hard to do, but requires a bit more knowledge.

And that "safely" is only when the infrastructure is properly operating. There are a few failure cases in which the device won't be safe. Admittedly, they're remote and require failure of a neutral in campgrounds wired using 3-wire methods, but I've seen them.
 

GOPJEW

Member
Jul 5, 2015
571
255
Potomac, MD
And that "safely" is only when the infrastructure is properly operating. There are a few failure cases in which the device won't be safe. Admittedly, they're remote and require failure of a neutral in campgrounds wired using 3-wire methods, but I've seen them.
Thanks for the notes of caution. I will stick with my plans.
 

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