Anderson "type" connectors work great and come in different sizes. I used them on a removable electronics tower in my past Zodiac and now have one to plug accessories in, and my battery charger on my AB RIB.
Amperage draw determines size of connector needed. They can also be purchased with covers, and dielectric grease helps keep corrosion away. I use the 50amp variety on my boat. They make them big enough to handle battery connections on winches and about every tow truck in the USA has one for jumper cables to plug into.
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