Question

4. PROBLEM: You need to design and select rechargeable battery (capacity in Ah) and a solar panel (area and dimensions) for the designed wireless sensor node for a back up of 3 days assuming you have a good 8 hours sunny day. The time duration of 8 hours is sufficient to charge the battery fully. The following specifications are provided of the sensor node: Operating voltage of the sensors (VS): 3.3 V Current requirement of the sensor (In): 0.1 mA Current requirement for transmitting data (Itd) : 30 mA Time duration for transmission (ttd): 1 ms Frequency of transmission (ftd): 100 Hz Current requirement for receiving data (Ird): 25 mA Time duration for receive (trd): 1 ms Frequency of receive (frd): 100 Hz Efficiency of the power converter is 85% and the efficiency of the solar panel is 19%. The battery voltage (VB): 7.2 V. Average power density of sunlight is 0.00188W/mm2

For the problem above find the panel seize and battery capacity with the following details. The back up of 7 days assuming you have a good 8 hours sunny day. The time duration of 8 hours is sufficient to charge the battery fully. The following specifications are provided of the sensor node: Operating voltage of the sensors (VS): 3.3 V Current requirement of the sensor (In): 0.2 mA Current requirement for transmitting data (Itd) : 45 mA Time duration for transmission (ttd): 10 us Frequency of transmission (ftd): 200 Hz Current requirement for receiving data (Ird): 50 mA Time duration for receive (trd): 10 us Frequency of receive (frd): 150 Hz Efficiency of the power converter is 80% and the efficiency of the solar panel is 21%

The battery voltage (VB): 7.5 V. Average power density of sunlight is 0.002W/mm2

Answer 1