Can I connect a 5w 5w solar panel directly into a 10k mAh portable battery bank safely via USB 2.0, or does it need some sort of protection in-between like a solar charge controller or a schottky diode?

Example of battery bank (except one with usb 2.0 input): https://www.anker.com/ca/products/a1229

Example of solar panel: https://www.aliexpress.com/item/1005006012344670.html

5W 5V Solar Panel

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[–] [S] 2 points 2 years ago

The panel already has a USB 2.0 cable. I just added a photo to my post to make that clearer. Thanks for the suggestion, I'll try to test out the peak voltage.

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