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Ash2020 i would say only the solar panel is. My advice is assume it is not and get some waterproof tape to seal its seams and screws.

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Ash2020 Open voltage, Voc is 14V. So it should charge 12v battery (maybe three 18650 batteries in series).

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Ash2020 Hi. Just regular buyer here. To charge 12V battery, the solar panel usually has open voltage of 18V. Search for it to confirm. This is to compensate for clouded sun and voltage drop. I think it is same principle with this fan. Still, I would use a multimeter to check its solar output voltage and buy the missing regulator if needs be.

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