Solar power supply for ZigBee wireles sensor network

Zigbee wireless sensor network is widely used in telemonitoring systems, one of which is telemonitoring system for environments. The sensor nodes are placed in areas in which power source are not available. Hence, a system that can supply the energy use of energy resources available in the environment is required. This paper shows the solar power supply design for a node in ZigBee wireless sensor network. The power supply system uses two 10 watt solar cells in parallel circuit with a maximum voltage of 22 volts DC and 1400 mA maximum current and two batteries with a voltage of 12 Vdc and a maximum capacity of 7.2 Ah. An optimal charging process requires ± 14 Vdc voltage and battery charging time with the input current of ± 1 ampere is 9-10 hours. Taking around from 16 to 18 hours, the process of discharging the battery with a maximum current consumption of the device uses 300 mA Zigbee.