Craig:

What is "on" on the boat. Sometimes the AC comes throught the inverter/charger before it gets to the convenience outlets. Usually, you'd "break" the AC "bus" in the panel so that high loads wouldn't be through the inverter (example, the hot water heater).

If you had a couple of space heaters on the boat now, plus a charger, you could easily exceed your 30 amp main service breaker load.

Or, if you had a large charger and a hot water heater, you might be tripping the main AC breaker.

(We have a 50 amp, 125V shore power. If we have the "200 amp" mastervolt, the hot water heater, the air conditioning, units, all running, we can pop the main service breaker on the panel or at the disconnect. The Mastervolt chager has "powersharing" (i.e., load shedding function, but it will only affect the MasterVolt unit's draw in charge functions) but that won't solve the problem in some peak conditions.)

So what's on the boat? What's "on" when this happens, etc. How is it wired, etc.

Have you checked to see that the breaker isn't popping when you REconnect -- or is when you simply DISconnect?

Listen to Mainsail on the arcing issues. Beyond frying fish or killing swimmers, it's much safer to shut the power off for a number of reasons.