Estimating the power consumption of a system can help with selecting the best power supply option. The system power consumption can be approximated by calculating the average current required by the datalogger, sensors, and peripheral equipment. This average current drain is primarily determined by the percentage of time spent in an active versus quiescent state, which can be approximated from the scan rate and program length of the datalogger.
For more information, and guidance through the calculations, see the "Power Supplies Overview" brochure or the "Power Supplies" application note.