Generator Selection

Generator Selection

Generator selection for cruising boats has grown more complex with the diesel, gas, inverter, and hybrid options flying around. As someone who has owned three different marine generators across two boats and spent way too many hours troubleshooting them in hot engine rooms, I worked through the fundamentals of picking the right genset for your cruising life. Today, I will share it all with you.

A generator on a boat is one of those things you don’t think about much — until it stops working. Then it becomes the only thing you think about. Air conditioning gone, water maker offline, batteries not charging. I had a generator seize up in the Bahamas once during a July heat wave, and the three days it took to get parts shipped in were some of the most uncomfortable of my boating life. That experience taught me to take generator selection and maintenance very seriously.

What to Actually Consider When Choosing a Genset

Probably should have led with this part honestly. Prepare your vessel by calculating your peak electrical load realistically — add up what you’ll actually run simultaneously, not just total capacity. Develop your understanding of duty cycles, because a generator that runs at 80% load is happy and efficient, while one that’s constantly at 30% builds carbon and causes problems. Plan conservatively on sound levels if you anchor in populated areas, because your neighbors will let you know if your generator is too loud. That’s what makes generator selection endearing to us passagemakers — the right unit runs quietly in the background, powering everything you need without drama, while the wrong one becomes a constant headache that dominates your maintenance schedule.