Hydrogen power

200kg of hydrogen stored in 25 bottles at 350 bars

An on-board system for hydrogen production

When MS Porrima sails during the day, solar energy is produced and it is used to propel the ship and recharge the batteries. At night, the latter will supply the necessary energy to sustain life on-board and power the boat. When the boat is docked, the surplus solar energy is used to produce hydrogen, which is stored in high-pressure tanks for later use.

First, seawater is pumped, desalinated and then stored aboard. This fresh water is then purified before being electrolyzed by using the surplus photovoltaic energy available.

The electrolyzers produce hydrogen at pressures up to 50 bars. The hydrogen is initially purified (dried), then compressed at 350 bars and stored in specially designed tanks. In this way, nearly 200 kg of hydrogen can be stored aboard, providing six to seven extra days of energy.

200kg of hydrogen stored in 25 bottles at 350 bars

The hydrogen is then converted back into electricity via two 30kW fuel cells. These fuel cells maintain the level of charge in the batteries. Alternatively, they can be used to run the electric engines if needed.

200kg of hydrogen stored in 25 bottles at 350 bars
  • An energy source on demand. If required, hydrogen can be converted into electricity via the fuel cell system in order to supply the necessary energy. This demonstrates that a boat can operate using clean energy, and that energy transition in the marine sector is a reality.
  • Self-sufficiency in terms of energy at sea: Aboard the boat, 25 bottles of hydrogen are stored at a pressure of 350 bars. Nearly 200 kg of hydrogen can be converted to about 2,600kWh of electricity. This is roughly equivalent to four times the amount of electricity stored in the boat’s batteries (745kWh). Thanks to the hydrogen system, the vessel has six extra days with which it can make headway at a speed of five knots without sunshine.
  • A commercially-viable technology: The hydrogen solution used by MS Porrima is based solely on existing technologies in partnership with various companies.


  • Solar power

    Solar power

    512㎡ of solar panels and storage in the 8 tonnes of batteries

  • Wind power

    Wind power

    40㎡ of automatically controlled kite deployed to an altitude of 150m