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You may want to check whether proper waterproofing was applied during the solar panel installation. If not, it could lead to hardware damage or failure. How to connect Tapo Solar Panel to compatible Tapo devices with proper Waterproof Gasket
Make sure you’re using a 5V, 1A charger. When you plug in the USB charger, the camera’s LED should blink amber quickly for about 3 seconds, check whether this happens normally.
A full charge takes roughly seven and a half hours. Let the camera charge completely, then test it again. Also, remember to turn the camera on before checking: press and hold the power button for 3 seconds to power the camera on or off.
If the camera still cannot be turned on and it was installed properly, you may contact the retailer or local TP-Link support to claim warranty. Contact Technical Support