부산대학교 도서관

Solar panels are located in areas where electrical energy is difficult, monitoring performance is needed when damage occurs. For this reason, it is necessary to measure parameters such as voltage, current and battery temperature. The technology that can work is LoRa., implemented LoRa as a communication protocol for 2 nodes using the point-to-point LOS method, a distance of 3 Km, RSSI value -117 dBm with 10.4 dB noise. Time of arrival 348.26 ms, total data packets PRR 12.80% packet loss 87.1%. Using the waiting protocol method, the maximum distance is 3 km, RSSI -117 dBm, the total delivery time is 922.271 ms, packet loss 51.8%, the results of monitoring the temperature sensor are in the range of 27–30 degrees for the current generated 0.1 Ampere to 0.3 Ampere for a voltage of 12 volts the voltage sensor, then the multimeter reads 12.30 volts a comparison of 0.3% compared to the sensor results. The larger the payload length acceptance ratio results in a decrease in the PRR level in data reception, in the study the payload value at 1032 bytes has decreased the PRR value at 48, 17% with a TOA value of 423.271 ms. Path loss in free space condition is more stable than urban cellular area with n = 3 so that the path loss value obtained is very small at a distance of 100 meters -77 dBm this is due to the many obstacles with cellular radio tower obstacles.