Can I Charge My Laptop On A Sailing Boat?

For many cruisers with simple electrical needs, a laptop computer can be the biggest power hog onboard. To charge a laptop, use a small inverter from the boat batteries or a 12V DC to DC converter. DC converters are usually 30% more efficient than an inverter and should be kept fully charged or removed for maximum efficiency.

Sailboats generally get their electricity from shore power in a marina or from their own generators. Accessing the internet on the boat is usually possible through a marina connection, 3G Internet purchased, or free Wi-Fi accessed via a Wirie booster. A laptop battery is 2-3Ah, while most boats have a 100Ah battery charged by a 50-100A alternator.

A 12V USB outlet allows the electrical system to power small electronics and appliances such as laptops and coffee makers. Connect to the 110 or 120V AC system via standard house electrical outlets. Not all MSC boats come equipped with an inverter. USBC with PD is a standard, so all you need is a USB PD charger and a USBC cable.

It is not recommended to sail a boat without an inverter as it can result in short battery life. DC-DC chargers are for charging the batteries with the alternator. Get one of these types.

A large laptop draws about 6 amps, and using a PWR 12V to 19V power supply with a cigarette lighter plug works fine. It is relatively easy to charge a phone from a 12V outlet and I’ve figured out how to power my iPad via 12V, but the laptop was a challenge. John K, a 12-Volt Laptop Charger expert, offers advice on saving energy onboard with a 12-Volt Laptop Charger.

In summary, for many cruisers with simple electrical needs, a laptop computer can be the biggest power hog onboard. To ensure optimal performance, consider using a small inverter from the boat batteries or a 12V DC to DC converter.