What does the 97% storage efficiency of a flywheel represent?

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SUMMARY

The discussion centers on the 97% storage efficiency of flywheels, specifically when utilizing vacuum and magnetic bearings. This efficiency metric indicates the energy retention capability of flywheels, suggesting minimal energy loss during storage. The participants question whether the 3% loss occurs over time or is a one-time transfer loss, highlighting the need for clarity on the time frame associated with this efficiency rating.

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nwilkins259
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In my exploration of energy storage options i came across a statistic several times that given a vacuum and magnetic bearings, a flywheel can achieve 97% storage efficiency.

Whether its true or not, what does 97% represent? Does it imply that the energy will hold regardless of time and its a one time transfer loss or do you lose 3% per period of time.

If i find the source ill post the link.
 
Engineering news on Phys.org
It must assume a certain time period -- or perhaps that's over 0 time.
 

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