Why don t bicycles use mechanical solar container

They are sustainable means of transport, capable of generating clean energy through a simple alternator that transforms mechanical energy into electrical energy, which can be also stored in a portable battery if needed. The energy and material used for its production go up while its life expectancy decreases. While electric bikes zip past with battery-powered ease, traditional bicycles remain stubbornly "analog. Therefore, any additional energy required to operate the energy-harvesting apparatus would correlate to a proportional increase in the energy intake.