Galvanic Isolator tripping new dock power pedestal

Others with more knowledge will chime in, but I bet the problem is due to the new electrical code that requires a ground fault circuit breaker on the power pedestal. If that is the issue I am told that there is most likely a problem with the item that has been isolated (your galvanic isolater). Boat US had an article on it. It has proven to be an issue for a lot of boats. When I docked at Naples City Marina (new docks built to new code) they gave me a info sheet on the issue at check in. I don’t know if there is sensitivity of the GFCI breaker plays a role in the problem. I was expecting trouble at Naples and had no issues.

Your galvanic isolator was disconnected and the green wire left not connected to anything?
Not a good idea for safety reasons but that proves there is ACv current flowing out on your green wire.

A problem we had on a customers boat years ago when this GFCI started, on-board his white and green ACv were strapped together. Some return current was returning on the green wire and tripping that d$%^ breaker.

White and green should only be strapped while on the generator, open on shore power. Older installations do not switch this at the transfer switch.

As Skippy J commented, AC and fridge compressors are notorious for leaking current on the green wire, old and new equipment.
If your ACs are 220Vac and on a single pole breaker, you may still have problems trouble-shooting these.

Rite and wrong.
When on dock power, the ground (ACv green wire) and the neutral (ACv white wire) should never touch on the boat. They are tied on the dock, not the boat. The green wire carries fault current only...
When off the dock, running inverters or generator, now your dock service fault line in not available.
Later model inverters have the availability of an internal relay to tie ACv green wire to the ships bonding where fault current flows to the water.
Your generator may already have white and green wires (frame) strapped or switched at the transfer switch for fault current to flow to the water.

The isolation transformer still uses the green wire for a fault current path back to the dock service.

Bottom line, ACv white and green (frame) should never be tied together on a boat while on dock service.

Galvanic isolators are usually nothing more than a large diode that prevents DC current in the millivolt range from coming aboard the boat from the shore (other boats, really). The voltage drop of the diode could be sensed as an open ground by the Ground Fault Circuit Interrupter.
CSkipR, when you say that you disconnected the galvanic isolator, did you connect the boat ground and shore ground wires together?

Do you have the factory ACv schematic? Contact Paul Hall @ Hatteras and they will send you a set if you want it.
That could help but I can come down and figure it out with or with out.
,rc

+1

If the white is loose with the green from the dock power then fault AND 115Vac is returning thru the water. Not safe and divers nightmare. Don't let any divers under your boat until this is resolved.

Skip
You have a single 240v / 50A plug or dual 115Vac / 30A plugs?

That's what I thought, but had to ask.
That makes all easier.

More on this just came to mind this morning.
Usually, the service from the dock to a 240Vac on board isolation transformer does not include the white wire (neutral).
The output of the isolator (designed like an Auto Transformer) creates the white wire tap for ships use.

If Skip has an isolation transformer, there should be no white wire connected to his galvanic isolator.
Hey Skip, do you have a big white Charles Box on board?

Skip
Bottom line, an ohm meter should show an open on the shore power male pins between white and green wires (neutral and ground). If there is any conductivity, you will trip all new marina breakers.
Absolutely no voltage (ACv or DCv) over a test resistor (10+K should work) between these same points also.

Per your post #18. If these are sensing wires (blue / brown) they may be causing enough noise to alarm & trip the shore service breaker.

The wave of the future you have experienced. It's going to happen more often as marinas start using these new safety breakers.

One marina in Jax has a current sense coil around your power pole green wire and not these fancy breakers.
They give you till next noon to correct if they see any current on the green wire (recorded and reported on an office computer) or they kick you out.