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This is an industrial designed exercise bike from Lithuania that can store 2KWh of electricity generated by your own exercise.
The electricity can then be used for loads of stuff - it has a bunch of DC outputs, like USB-C (up to 60W) and USB-A, and AC outputs (can output up to 2KW - enough for an oven!)
It can also be fed from a solar panel, or the mains.
It’s about 3K EUR, so not much more than a high end Peloton , but obvs serving a *very* different market…
https://www.tukasev.com/en/
This is an industrial designed exercise bike from Lithuania that can store 2KWh of electricity generated by your own exercise.
True, I only included kJ equivalent because some countries use kJ on nutritional panels instead of Calories. Actual conversion rate of human energy stores to usable power is, at a guess, more like
Calories * 0.25 * 0.6 * 0.8 - dt
where t is time, d is the self-discharge rate of the battery, 0.6 is the efficiency of the generator, and 0.8 is the efficiency of the battery.
Rule of thumb efficiency of humans is about 25%, which is about the kJ to Calorie conversion, too — so 14kJ of energy output burns ~14,000 Calories.
True, I only included kJ equivalent because some countries use kJ on nutritional panels instead of Calories. Actual conversion rate of human energy stores to usable power is, at a guess, more like
Calories * 0.25 * 0.6 * 0.8 - dt
where t is time, d is the self-discharge rate of the battery, 0.6 is the efficiency of the generator, and 0.8 is the efficiency of the battery.
So, user better eat their wheaties.