Commercially Available Bike Generators Are Not Sustainable

来源: https://solar.lowtechmagazine.com/2011/05/bike-powered-electricity-generators-are-not-sustainable/ 热度: 6 points on HackerNews

来源: https://solar.lowtechmagazine.com/2011/05/bike-powered-electricity-generators-are-not-sustainable/

热度: 6 points on HackerNews