I have buy some cheap "125*125 monocristallin silicium 2.7W 0.5V" here:
https://fr.aliexpress.com/item/32814021703.html?spm=a2g0o.order_list.0.0.7de15e5bq55yie&gatewayAdapt=glo2fra
They are beautiful, but break like glass and the energy production is close to zero..
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