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Might be. Schools have a lot of roof space and busses are generally used only twice a day at low speeds with multiple-minute stops for a total of 60-90 minutes per interval.

A lot of sun in Los Angeles to charge between 8:30a-2pm and 4pm-sundown.

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this used to be laughable to consider like 15 years ago, but there are guys on Endless-Sphere (ebike forum) that have solar on their bike that in some cases can generate enough power from the sun to keep the bike going. This would be a pretty simple calculation- I hope someone with more recent numbers could do it here

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