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

AI Thread Summary
The 97% storage efficiency of a flywheel indicates the maximum energy retention capability under ideal conditions, such as using a vacuum and magnetic bearings. This efficiency suggests minimal energy loss during storage, but it does not imply that energy is retained indefinitely; some energy may dissipate over time. The discussion raises questions about whether the 3% loss occurs as a one-time transfer loss or if it accumulates over a specific time period. Understanding the context of this efficiency is crucial for evaluating flywheel performance in energy storage applications. Further exploration of the source of this statistic may provide additional clarity on its implications.
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.
 
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It must assume a certain time period -- or perhaps that's over 0 time.
 

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