A system and related methods for powering a device module of IoT device with an energy harvesting module. A supercapacitor is charged by the energy harvesting module and discharged to the device module to power the device module. The discharge from the supercapacitor may be scheduled to power demanding tasks to provide sufficient recharging periods for the supercapacitor and avoid discharging the supercapacitor when the supercapacitor is insufficiently charged.