標題: Very cheap ( $15-40 ) solar collector-concentrator that does not need a tracker [打印本頁] 作者: peterchanchun 時間: 2021-5-1 18:32 標題: Very cheap ( $15-40 ) solar collector-concentrator that does not need a tracker Very cheap ( $15-40 ) solar collector-concentrator that does not need a tracker https://www.youtube.com/watch?v=iJCfsqvEx1w