Low-Tech Magazine: Human Powered Air Compressor and Energy Storage System
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https://solar.lowtechmagazine.com/2023/07/human-powered-air-compressor-and-energy-storage-system/
https://solar.lowtechmagazine.com/2023/07/human-powered-air-compressor-and-energy-storage-system/
Adding to this: This is basically turning solar energy in stored energy. Solar power-> growing Plants-> Man eats Plants-> kinetic energy-> storage
Simply take a solar panel and a battery.
You loose around 30% of energy from the sun through the atmosphere, plants are about 3% efficient at turning light into sugar, humans are about 25% efficient at turning food into mechanical energy, so you are only about 0.525% efficient at turning energy from the sun into human power on earth. So you this device is only about 0.231525% efficient at turning solar power into usable work.
Assuming 80% efficiency for the electric variant, 20% efficiency for solar panels, 90% efficiency for robots to turn electricity into mechanical work, that's 14.4% efficient. Then it's like 62.196307 times more efficient to become a solar electric android and pedal on it in space.