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I'm wondering if anyone is aware of a system for charging an electric vehicle for us off grid folks? Obviously I could just plug it in to a 120V AC outlet when we have adequate sun but that seems like a pretty inefficient and labor intensive way to go about it. I'm thinking of a something more along ...

My understanding is that despite efforts to minimize losses (e.g., air cushion bearings) it still takes a lot of energy to keep a massive flywheel spinning - and to spin it back up after being depleted. As such, this technology is more appropriate for smoothing loads in large scale systems with batteries ...