Hey there, neighbors! Great job checking the plug in adapter is securely plugged in, and ensuring several hours of direct sunlight. These are the most important steps to check first. Please also consider how many events are occurring, as too many events per day, or even frequently streaming live view, can drain battery quicker.
I recommend also checking out our Community post about battery drain for more tips on optimizing battery life, and the charge you receive. As long as the battery is not draining quicker than a charge can apply, the Solar Panel should certainly be working.
If you’ve checked the above and still are not receiving charge from the Solar Panel, please try resetting your Ring device by holding the setup button for 20 seconds. Once complete, fully charge your battery and monitor over time to see if a charge is applying. I hope this helps! 