New marina current leakage fault protection

[westboating]

Has anyone had any success with the new current leakage systems?

Our marina recently installed a system that measures the loss of current returning to the junction box.  If the difference in current between what's going out to what's coming back to the box exceeds 100 milliamps the system trips and the entire dock is de-energizes.  To be clear this is in addition to the conventional over current protection of the breaker box.  We returned from our trip to the San Juan's and as soon as we connected to the shore power the whole dock shut down.  I did have the battery charger and the water heater on.  After resetting the breaker, we could see that any A/C beyond the battery charger resulted in a trip.

We had her into Sundance for a few weeks and they only measured about .2 milliamps of leakage at their marina on their power cord.  When I got to our marina today I attempted to isolate the issue.  If I turned off everyone's power but mine, I could run the battery charger and one other A/C item, either the water heater or the microwave.  Part of the problem is that the system trips on the aggregate of 100 milliamps, and our boat with the battery charger and the water heater or the microwave showed 75 milliamps, and when you add in 7 or so mamps from the lighting systems and a few other bigger boats, all it will support is the battery charger.

I tried other dock outlets with similar results.

Any advice or experience is appreciated.