Bygga en solpanel med gamla ölflaskor? Det gjorde en kinesisk bonde för att hans mor skulle kunna duscha i varmvatten.
"A Chinese farmer has made his own solar-powered water heater out of beer bottles and hosepipes. Chinese farmer Ma Yanjun has made his own solar-powered water heater out of beer bottles and hosepipes /Lu Feng. "I invented this for my mother. I wanted her to shower comfortably," says Ma Yanjun, of Qiqiao village, Shaanxi province. Ma's invention features 66 beer bottles attached to a board. The bottles are connected to each other so that water flows through them."Via MakeZine som har instruktioner för hur fler soldrivna varmvattenberedare kan byggas, t ex den här: