Technology
Size solar, batteries and data links for remote soil monitoring.
A sensor can keep measuring after a crew leaves, but its battery depends on a sound power plan. Size solar and storage for sensing, processing and sending readings.
Set the measurement and reporting schedule first. Frequent readings and transmissions use more energy, so match the power system to how often the field actually needs data.
Include sensing, processing and each transmission in daily energy use. A device averaging 0.02 watts uses 0.48 Wh per day, though real use varies with radio and schedule.
Estimate battery capacity from daily energy use and the number of days the system must run without sun. Divide the required energy by battery voltage, allowing for usable capacity.
Compare the panel’s expected harvest in the weakest solar season with daily consumption. Panel wattage, peak-sun hours and system efficiency provide a starting estimate, not a guarantee.
Install the panel where it receives unobstructed light at its actual height. Shading, angle, dirt and charge-controller behavior can all reduce the energy reaching the battery.
Design around the site’s darkest season and a realistic run of cloudy days. Local weather, canopy, reporting frequency and recovery time affect the reserve the system needs.
Before increasing panel size, consider longer reporting intervals, batching readings and low-power settings. These changes can reduce avoidable demand while preserving useful field data.
Test communications at the final sensor position. Cellular may use more energy when signal is weak; LoRaWAN needs a gateway, while satellite costs and energy needs vary.
Check charging, battery state, readings and a successful upload or offline record before leaving. If uploads stop but local readings continue, investigate connectivity before replacing hardware.
Keep reading