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If somebody is interested: these guys here at https://iot.halaser.de offer a ESP32-board which supports power via USB or solar cell, which includes battery charger and deep-discharge protection and is prepared for LoRaWAN and GPS. Seems to be everything that is needed for portable/autonomous applications that run completely stand-alone!
No need for a battery if you are good with hand generator -- but you are not allowed to stop
I would prefer to combine this handgenerator with a battery too
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