Most ShorePowersystems are based on 30A service, unless the additional capacity of 50A service is needed for large boats. Whether your marina supplies 15A, 20A or 30A service to your dock, we recommend that you use a 30A ShorePowercord and inlet on your boat for consistency, and then obtain waterproof adapters for other amperages. All components are covered by Marinco's five-year warranty.