I have been reading the discussion shore power connections and would like to offer the following: Using a Y-connector to connect two 30 amp 120v shore power connections to a 50 amp 240 volt cord will only give you 60 amps 120v available on your boat as opposed to the two 50amp 120v available (100 amp total) when using a 50 amp connection. This is why the 50 amp cord is much heavier than two 30 amp cords. Caution should be observed since the circuit breakers on the boat are 50 amp and if either leg exceeds 30 amps, one of the shore power breakers will blow. If you have any 240 volt appliances on board, the two 30 amp shore power connections used with the "Reverse Y" must be of different phases or the 240v appliances will not operate. Our boat has both a 30amp 110v and a 50amp 240v connections. A onboard switch selects which source is being used. When connected to 50amp 240volt, two 50amp 110volt circuits are available for a total of 100 amps. One circuit supplies the 110 volt appliances, lights, outlets, and inverter. The other circuit supplies the heaters and air conditioning. Nothing on our boat operates on 240volt. When the 30amp cord is used, it feeds only the 110 volt appliances, lights, outlets, and inverter. With our onboard main set at 50 amps, it is very easy to blow the shore power circuit breaker when loads exceed the 30 amps. The inverter should be reset to 30 amp to assure that it does not overload the circuit. This is a real PITA as we have too many appliances on board. Gary Brobst m/v Waypoint 49 DeFever RPH Currently at Oak Harbor Marina Slidell, LA