嗯，這樣挺好。

就是不要想著自己家裏實現能源自給了。

Doing the math: an hour on the bike generates around 0.11 kWh (more or less, depending on how fast you cycle, but probably not much more), and the average North American house uses 30 kWh per day. So, an hour on the bike provides only 0.37% of the energy needed for 24 hours, or approximately enough for five minutes. 

https://www.ecohome.net/guides/1192/60-minutes-on-this-bicycle-can-power-your-home-for-24-hours-or-maybe-not/#:~:text=Doing%20the%20math%3A%20an%20hour,approximately%20enough%20for%20five%20minutes.