The correct generator size depends on your vessel’s total electrical demand. Air conditioning, refrigeration, navigation electronics, battery chargers, watermakers, cooking appliances, and entertainment systems all contribute to your required generator capacity.
As a general guide:
- Small sailboats: 4–8 kW
- Cruising yachts: 8–15 kW
- Large yachts: 15–40 kW
- Commercial vessels: 30–300+ kW
Choosing the correct size prevents overload while improving fuel economy.