Flywheel Energy Storage Systems are interesting solutions for energy storage, featuring advantageous characteristics when compared to other technologies. Research focuses on cost aspects, system reliability, and energy density improvement for these systems. In this context, a novel shaftless outer-rotor layout is proposed.
The cost of a 25-kWh Flywheel storage system ranges from $4,,015 to $7,,400. The cost of battery storage is from $3,,972 to $8,,700. The efficiency of a Flywheel system is 73 percent compared with 65 percent for a battery system.
Flywheel batteries are probably the most compact energy storage systems that can be designed with the lowest environmental impact and highest durability. Not quite domestic, but the technology keeps maturing. It's better suited for leveling short-lived and massive power needs rather than storing energy for days (note the 7%/hr loss below).
Flywheels are being considered for use as the energy storage system on a proposed orbiting space station due to their potentially high storage density. During the past several years, graphite fiber technology has advanced, leading to significant gains in flywheel energy storage density.
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