How long can flywheel energy storage last

How does a flywheel energy storage system work?

Flywheel Energy Storage Systems (FESS) rely on a mechanical working principle: An electric motor is used to spin a rotor of high inertia up to 20,000-50,000 rpm. Electrical energy is thus converted to kinetic energy for storage. For discharging, the motor acts as a generator, braking the rotor to produce electricity.

What is a flywheel/kinetic energy storage system (fess)?

Thanks to the unique advantages such as long life cycles, high power density, minimal environmental impact, and high power quality such as fast response and voltage stability, the flywheel/kinetic energy storage system (FESS) is gaining attention recently.

Are flywheel energy storages commercially available?

Flywheel energy storages are commercially available (TRL 9) but have not yet experienced large-scale commercialisation due to their cost disadvantages in comparison with battery storages (higher investment, lower energy density). Another challenge is the comparably high standby loss in FESS caused by the magnetic drag of the motor-generator.

How long does a fess flywheel last?

However, only a small percentage of the energy stored in them can be accessed, given the flywheel is synchronous (Ref. 2). FESS is used for short-time storage and typically offered with a charging/discharging duration between 20 seconds and 20 minutes. However, one 4-hour duration system is available on the market.