One simple way to do this is to use a solar panel to charge the batteries of your cordless power tools.
Mobstub solar charger instructions.
Solder the diode to the red wire on the solar panel with the negative side of the diode marked black facing away from the panel.
In this project i am going to show you several ways that you can do.
Never be without battery thanks to this.
Solar battery charger for your cordless power tools.
It allows you to conveniently charge anywhere anytime using sunshine.
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Put heat shrink on the wires of the battery holder then solder the black wire on the battery holder to the black wire on the solar panel and the red wire to the diode.