I only have 1 power pedestal available at my boat slip at the marina and it is a 50Amp Locking style, but I have to power 2 boats. I have seen a Y Adapter that splits the single 50Amp connection into 2 30Amp connector, but wondered if it was safe to use. How does a marine / RV Y adapter work? Are they safe?
They are wonderful for solving multiple power issues, because you can use them to power two boats / rv’s etc. off one power source.
We hope to teach you how they work and how much power you can run on a Y Adapter.
How do they work?
Let’s start with a 30A Y Adapter. Imagine that the cables you are using are actually STRAWS, and the shore power pedestal you are plugging into is a LAKE. The limit to what can be pulled from the lake are the circuit breakers protecting both ends.
Normally a 30A shore power pedestal will have a 30A breaker protecting each 30A outlet. This is also true to about your RV or boat. They both should have a main circuit breaker for each individual Inlet.These breakers limit the amount of amps your RV or boat can draw from the shore power pedestal.
A Y-Adapter allows you to pull power from the single outlet, and split it into 2. Because you split the power into TWO now, you have to remember that you cannot exceed the power source you are plugged into (30Amps in this case).
You can have many combinations of amps drawn all adding up to a total of 30 amps or less.
When using a Y Adapter from a 30A Power Source…
If either combination of boat / RV tries to draw more than 30 amps from the power source, the circuit breakers will trip. As shown in the chart.
Using a Y Adapter when plugged into a 50A Power Source…
If you try to draw more than 30Amps from either inlet, circuit breakers in the RV / boat will trip. If you try to draw more than 50 amps total between the two, the dock breaker will trip.
What if the Y-Adapter has two different ends?
The same thing applies. You should never exceed the combined amps from the power source.