AC And DC Motors Reviews

The battery bank is mostly made up of the usual lead acid batteries. Lithium ion batteries and fuel cells are also being used on an experimental basis, but have yet to be made commercially viable on a mass-scale. Whatever the battery type, every electric boat always has a charger and charge regulator to ensure the battery doesn't overcharge.

The electric motor is usually a DC motor. It can be field-wound or the permanent magnet type. The advantage of using DC motors is that they don't require high voltages, so it is a lot safer and needs less insulation. Also, DC motors offer a choice between electronic and mechanical controllers, while AC motors necessarily need electronic controllers.

The simplest setup has the motor using a propeller shaft to power the propeller. If gears are required, it can be a common gear box or coaxial gears. In order to reduce noise, transmission belts are often used instead. The whole setup, including the motor and propeller, are often part of a system at the back of the boat. In this case, it is known as an outboard motor.

There are no carbon emissions or exhaust to speak of. Unlike an internal combustion engine that runs on diesel, an electric boat is not harmful to the environment. Another big advantage is that an electric powered boat makes comparatively very little noise. Even this little amount of noise can be reduced to almost nothing by using sound-proofed boxes and anti-vibration mountings.

The eco-friendly advantage can be further enhanced by using renewable shore energy or solar power. The only difference is that onboard solar panels mounted strategically on the boat charge the batteries, instead of having them charged using shore power. To be noted that commercial boats that have a daily schedule cannot depend solely on solar power, so these are hybrids called 'solar-assisted' which combine solar power and fuel.

While electric boats are still mostly restricted to inland waterways, there is a huge amount of ongoing research in this field. Solar and wind turbine powered boats are being built to cross the oceans. Batteries are being developed that need less charging and do not have to be refilled. The day is not far when large ships with thousands of passengers and crew will run entirely on clean electric power.