50 amp to 30 amp - options/ suggestions?

[Soul Mate II]

My summer marina has a 50 amp connection which I can plug directly into. Where I am today prior to coming out of the water has 30 amp pylons (electrical towers with receptacles). What do you use to split the power. I have a Hubbel YQ230 but it isn't working - see picture. What other options to I have to power the boat.

In addition, as I head into winter layup, I will have to go from the 50 amp to the 2 30s to then 110v.

Your help is appreciated!

 

[ttmott]

The 50 amp connection has four conductors: two 120 volt hot legs that are out of phase (sometimes called "split phase"), one neutral, and the outer part of the plug housing is the ground. You should get 120 volts between each of the hot legs and neutral. 240 volt power is derived by the two 120 volt out of phase conductors and the neutral is not used.
The 30 amp connection has three conductors: one 120 volt hot leg, one neutral, and one ground.
Many marina's will provide two 30 amp connections per slip. The two 30 amp connection hot legs should be out of phase so with the correct adapter you will be able to provide the boat's 240 volt requirement. Take a DVM meter and measure the voltage across the two 30 amp hot legs (assuming there are two 30 amp connections). and if you get the 240 volts your Hubble device should work. If you are getting 0 volts when measuring the two 30 amp connections that then means the 120 volt is in the same phase and your Hubble device will not operate. Hope this helps - Tom

 

[JVM225]

My summer marina has a 50 amp connection which I can plug directly into. Where I am today prior to coming out of the water has 30 amp pylons (electrical towers with receptacles). What do you use to split the power. I have a Hubbel YQ230 but it isn't working - see picture. What other options to I have to power the boat.
View attachment 76701
In addition, as I head into winter layup, I will have to go from the 50 amp to the 2 30s to then 110v.

Your help is appreciated!

What is coming off your boat?
A single 50 amp?
Single 30 amp?
Two 30 amps?
I may be wrong, but I’m thinking that a 1999 340 would probably have started life with two 30’s coming off the boat.

 

[boatmailster]

The splitter what you have is to be used with 2x 30A power supply to get 50A 230V service to your boat. I assume your boat is 230V 50A. In order for that splitter work you need to supply two SEPARATE PHASE 30A services. If you are not getting output then keep one 30A cord connected to one tower and another 30A cord connected to another tower. Chances are towers close to each other may be wired on same phase and you will need to find tower with different phase. I have seen that people had to use extensions to 30A power cords to reach power towers with separate phase to get 230V coming to the boat. You can check if your boat is 120V or to 230V by checking what is written in original power cord, male end. It would be either 50A 120V or 50A 120/230V. Second one requires 2 separate phases.

 

[Cocktail Time]

Not sure about your marina, but where we are, they will come out and change the dockside power over to whatever you need. Much easier than trying to do the above, and free...

 

[The Bill Collector]

We are 240v 50 amp and if the marina only has 30's available sometimes I have 100 feet of 30amp cable laying on the dock to find the right leg of 30amp for my 240 adapter to work...