The Flat Ditch and Utopia Ditch stations’ power consists of 8 alkaline D-cells. Fully charged the battery pack is nominally 12V. Fully discharged, the pack would be at 7.2V. The datalogger continues to operate, and collect and store stage height data, at voltages as low as 7VDC. The cellular modem will stop uploading hourly data when the battery pack voltage drops to about 9VDC. You should change the batteries before the voltage drops below 9VDC to insure uninterrupted data transmission. The blue area of the graph highlights the working voltage range of the alkaline battery packs.

Minersville Reservoir power is provided by a 30 Watt solar panel and 100 12VDC AHr deep cycle marine battery. The daily charge/discharge cycle showing higher voltages in the day and lower at night is evident on the graph.

The flume below the reservoir is on its own solar system with a 10W solar panel and a 12VDC 12AHr AGM battery.