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Old 09-02-2017, 01:00 PM   #13
twistedtree
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City: Vermont
Join Date: Jan 2013
Posts: 10,093
A few things to add.....

There are a couple of ways to confirm whether your HVAC is 240V or 120V. On a newer boat like yours I would expect 240, but you never know. First check is to look at the breakers. If they are tandem breakers (two switches with a bar connecting them so they switch together), then it's 240V. The other is to go look at the name plate on one of the compressors.

If you go the route of a 2x 30A combiner to create 240V for a 50A plug, which I expect you will, be sure to also buy at least one 25' or 50' 30A extension cord. The two 30A plugs on the combiner are short - maybe 3' each - and quite frequently you will find the two 30A outlets that you need are spaced much further apart than that.

Last, there is yet another way to get 240V service from a 30A dock socket, and that's with a transformer. I know a number of people who have luggable boost transformers to bump 208V up to 240V. But there is no reason you can't do the same thing to convert from 120V to 120/240V. The plus side is that you only need a single 30A outlet. The down side is that you will be restricted to the power of a single 30A outlet, so about 3500W. With a dual 30A to 240V combiner you get the power of two 30A outlets, so about 7kw. That all compares to the approx 12kw you get from a 50A outlet.
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