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Old 01-10-2018, 06:22 AM   #17
Flatswing
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City: Windmill Harbour, Hilton Head Island, SC
Country: United States
Vessel Name: River Girl
Vessel Model: 2004 DeFever 49 RPH
Join Date: Sep 2016
Posts: 102
There are usually 2 types of adaptors:
Smart Y will connect 2 'out of phase' 30A dock receptacles to a single 50A female to plug your 50A cord into-these are expensive ($3-500)but will allow you to run 240v appliances, AC etc ('though you will only get 30A total so need to manage your power draw). You must have 2 active 30A sources one providing L1, the other L2, or the "smart" Y won't work.
Second type is a simple 30A male- 50A female pigtail (typically<$100). it routes the ground to the outer collar for the 50A and connects the hot wire from the 30A to both L1 & L2 legs of the 50A receptacle. This will not power 240v appliances but may run 110v circuits depending on how your boat was wired.
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