Which adapter is needed for 50amp shore power cord?cord?

[_AJ_]

A friend just bought a 41' boat and had it delivered from San Diego. His shore power cord is a 50 amp 4 prong with a grounded locking ring.

His distribution panel is divided in two parts with the heavy loads like reverse cycle AC on one side and lighter loads on the other.

He has an adapter to convert to a 30 amp receptacle but only supplies power to the lighter load side of the panel.

During recent stay at a large local marina, the dock assistants ran an extension cord from way down the dock and had an adapter that provided him power on both sides of his panel.

Unfortunately, he didn't get a chance to see what they did or which adapter they used. Today, he went to the local marine store and they were not able to help him get the adapter he needs.

Has anyone run into this issue? If so, can you help identify what he needs to buy to make it work properly?

Here is a picture of his plug configuration.
View attachment 107843

 

[tiltrider1]

Sounds like he has a 50a 125/250v power cord. The normal Marinco 30a to 50a 125/250v adapter would power both legs. Remember you only get 30a total, not 30a per side. The adapter your friend has sounds like a home made adapter. I have made both a 50a 125v and a 30 a adapter that feeds only one panel, this prevents some one from turning on the washer and tripping the dock breaker.

 

[Giggitoni]

A friend just bought a 41' boat and had it delivered from San Diego. His shore power cord is a 50 amp 4 prong with a grounded locking ring.

His distribution panel is divided in two parts with the heavy loads like reverse cycle AC on one side and lighter loads on the other.

He has an adapter to convert to a 30 amp receptacle but only supplies power to the lighter load side of the panel.

During recent stay at a large local marina, the dock assistants ran an extension cord from way down the dock and had an adapter that provided him power on both sides of his panel.

Unfortunately, he didn't get a chance to see what they did or which adapter they used. Today, he went to the local marine store and they were not able to help him get the adapter he needs.

Has anyone run into this issue? If so, can you help identify what he needs to buy to make it work properly?

Here is a picture of his plug configuration.
View attachment 107843

This photo may not answer your particular question. I add it here for others searching in the future. Sorry the photo is flipped 90* to the side.

 

[Bacchus]

Hard to guess what power was available on the dock and what the marina attendant did?
Could have been 50A 125V/250V power further down the dock on a different pedestal and it was another 50A 125V/250V cord? That would provide 50A / side.

Or may have been a reverse Y to use two 30A 125V to feed both sides. That would provide 30A to each side of his panel.?
https://www.marinco.com/en/ry504-2-30
This would be the one if marina used his pedestal in addition to a second one w/ the extension?
Call the marina and inquire?

 

[O C Diver]

This adapter will work when you have two 30 amp outlets available and you have no 220 amp appliances on the boat. It will give two 120 volt feeds with 30 amps on each.

https://www.amazon.com/dp/B01KLA4PJ0/ref=cm_sw_r_cp_apa_i_UjjyFbCGSYCHF

This adapter will work when you have one 30 amp outlet available and you have no 220 amp appliances on the boat. It will give two 120 volt feeds with 30 amps in total.

https://www.amazon.com/dp/B01KF359K2/ref=cm_sw_r_cp_apa_i_SsjyFbKT1FV1X

Ted

 

[_AJ_]

The boat definitely has 250 VAC needs as the heating system is 250.

Is it common for a marina to offer opposite phases of 125vac?

 

[_AJ_]

Here is a picture of the AC distribution panel and the cord end.

 

[O C Diver]

The boat definitely has 250 VAC needs as the heating system is 250.

Is it common for a marina to offer opposite phases of 125vac?

Then you need to use an adapters as referenced in post #4. They have isolation circuitry that makes sure the two 30 amp plugs aren't on the same phase and will give you 220 - 240 volts. If the two 30 amp plugs are on the same phase, only one side will be energized.

Generally, if a power pedestal has two 30 amp outlets on the same side, they're on different phases. Have found a
couple that weren't.

Ted