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A foreigner named Frederik Krebs has already created a solar film that can be curled and straightened, even with an ultra-thin lithium battery and LED. So, this thing can be straightened up on the wall in the daytime. Convert solar energy to electricity and store it. In the evening, it can be used as a room lighting in the whole house. It can also be rolled into a tube and flashlight... And it is extremely cheap. According to Krebs's idea, the final production model will be The cost of such a solar LED film will be less than $7!
The news at the time was that this man had gone to a country like Zambia in Africa to conduct a trial... I haven’t known how it has progressed so many years ago...
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