How much power do the devices consume?
This partly depends on the configuration options used.
There are three ‘power-hungry’ parts of the devices, each with a nominal power consumption:
– Getting a GPS fix/position (48mA when acquiring fix, 37mA when tracking)
– Transmitting data via radio (complex, but sending a single log entry takes ~0.05mA for 0.003 seconds)
– Listening for data over radio (19mA, but only when active)
As each of these behaviours takes time, the amount of time allocated to each behaviour determines the total power consumption. We have created a Excel spreadsheet to help estimate the lifespan for a given battery capacity. This is available here: Lifetime Estimator Spreadsheet (17.46 kB)