Hi @dgold226. You can monitor the device's battery levels throughout a day where you have some free time to check on it. I recommend to check on the Device Health page in the morning, on a sunny day, to see the battery level. Then, after a sunny afternoon, see if the battery level increased at all. By the end of the night you should see a positive change in the battery's level, even if it's a few percentages.
If you do not see a change, you may need to look at repositioning the solar panel so that you can get more direct sunlight. Please note you need at least 4 hours of direct sunlight for a decent charge.