Ring Doorbell & solar charger not charging batteries

I have 3 of the Ring Doorbells, all of them are connected to the solar charger which is suppose to start charging once the battery hits 93%. I have them all installed in places where they are in direct sunlight for more than 80% of the day. I am constantly having to unplug the doorbell and charge them manually them plug them back up every 6 - 7 days. Evidently the chargers arent working. I thought about purchasing the larger solar panels but im very hesitant because of the performance of these chargers. They were supposed to be plug and play basically. If anyone has suggestions im open to try them. Need help