In order to enable seasonal electrical energy storage, a hydrogen energy storage was developed. This consists of hydrogen generator, metal hydride hydrogen storage and fuel cell. Hydrogen storage benefits from the separation of converter and storage, improving cost efficiency for long term storage with large storage capacity in respect to storage power.
Through the separation of storage power and capacity in hydrogen storage with water electrolysis, fuel cell and hydrogen storage tank, price reduction can be reached in respect to the equivalent battery storage due to the lower price of storage tank capacity for hydrogen.
The hydrogen storage system consists of a metal hydrate cylinder assembly of 10 cylinders, each with a volume of 10 l. The cylinders are able to store 4 kg of hydrogen, or 130 kWh of energy equivalent in respect to the lower heating value of hydrogen.