Troubleshooting

If for any reason the units are not working properly, a hard reset will usually fix the inconsistent operation of the unit.
For power related issues, if the solar panel is not charging, the small board unit connected to the battery will not have any light to show charging of the battery. If panel is not in use and the system fails to operate, it is likely the battery is running flat and needs to be recharged either by the solar panel unit or via a USB mini connection to the small board unit.
Alternative powering of the device could be supplied directly to the Arduino via a micro-usb cable to PC, if either conventional power units will not be utilised based on user preference.