Solar Charging Device

I installed a new Ring Video Doorbell 3 Plus with a Solar Charger (for Video Doorbell 3 and Video Doorbell 3 Plus x1). I installed the solar charger with my new Ring doorbell less than 3 weeks ago. As of this morning it’s showing an 11% charge and that I need to recharge it. I replaced my old Ring doorbell with the newer model and included the solar charger so that I wouldn’t have to keep charging it. I know that there will be days (clouds, rain, etc) when the solar charger won’t charge the door bell, but we’ve only had a few of these conditions over the past 3 weeks, and sunny days have had much more that 4 hours of sunlight; and there have not been a significant number of alerts/motion detections per day. The “Solar Status” for the device says: “Ring Solar Charger is connected and able to charge this device”. Also, I charged up the device before installing it. Also, when I’ve looked at the “Device Health” for the doorbell, I haven’t seen the battery charge change (increase). Is it possible I have a faulty solar charger? Please advise."