The source of DC power is usually one or more marine-grade batteries, normally 12 volts each. They are similar to automobile batteries, except sturdier—and of course more expensive.

The search, discovery, refinement and resource control of fuel has a rich and very sordid history. But just like…

In your house, your wall outlets deliver alternating current (AC) electricity. The electricity provided to your house and your marina from the national electric grid is AC. Most of the devices…

To be prepared and understand electrical power usage on a modern vessel, it is important to learn a few basic terms and concepts.