Using 2 30 amp shore power cords in lieu of a single 50 amp one

[ReelMagic]

You are correct your 50amp 240 volt cable is split into 2-circuits at the main electrical panel, each circuit capable of providing 120 volts @ approximately 30 amps... You also have a single 30 amp 120 volt circuit and when used powers both circuits but you are now limited to a total of 30 amp draw. When using the single 30 amp that is bridged you must limit yourself to drawing no more than 30 amps total or the main breaker will pop. On my 38 Open the main breaker for the 30 amp service is located outside in the cockpit near the connection for the dockside cable. M2C