Batteries & Onboard Power

If a boat's wiring is the lifeblood of your boat's DC electrical system, the battery is its heart. But unlike the battery in your car or truck, which is probably used (and charged) fairly frequently, boat batteries can sit dormant for weeks or months at a time, which can lead to a dead battery when you want to use your boat. In fact, TowBoatUS cites dead batteries as one of the top 5 reasons boats get towed.

Scroll down for the most common questions asked about boat batteries and to learn everything you need to know to keep them ready to power up when you are. You’ll also learn critical information about DC shore power, both aboard and at the dock.

View All Boat Batteries & Onboard Power Videos

Here are the BoatUS videos that include information on your boat's batteries or electrical systems, from wiring to troubleshooting and inspections to dangers.

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How To Select & Install A DC-To-AC Power Inverter

A fun day of fishing turns from a hot hit to cold fear in seconds.

Marine Battery Maintenance

Look after your marine battery, and it will serve you when you need it. Here is what you need to know.

Electric Boat Propulsion 2024

For some boaters, now may be the right time to make the switch. An electrical marine engineer and experienced boat owner explains the state of the technology and what kind of boating is ideal for it.

Boat Solar Panels

Sunshine and boats are a natural together, so why not use all that free energy? Here’s the lowdown on solar panel selection and installation

Epropulsion Spirit Plus Electric Outboard Field Test

Our contributing editor has used his new low-power electric outboard, with its dedicated carry-on battery, for two years now, and it looks like we have a convert!

Fathom E Power System Next Level Power Grid

The Navico Group unleashes 'the world's most advanced power system,' an integrated lithium-ion power management system like nothing else out there.

Marine Solar Panels

There's more to solar power than just buying any old panel and connecting it. Let's find out what may be best for the way you use your boat.

Electric Dreams And Hybrid Solutions

Interested in plugging into the growing world of electric and hybrid-powered boats? Here's how they work, their benefits, and limitations.

What Can You Do With A Multimeter

When it comes to tracking down electrical issues on board, this hand-held tester is a real stress-reliever. Here's how to use it.