Monitoring system of stand alone solar photovoltaic data

Monitoring system was designed by using the voltage sensors and the current sensors that had been calibrated. Data acquisition system was integrated with Excel by using Visual Basic program. The system design used Atmega 8 microcontroller connected to a laptop / PC via Ethernet WIZ107SR and Netgear router. The accuracy of the photovoltaic panel output parameter reading was determined by the accuracy of the reading of the current sensors and the voltage sensors used in the monitoring system. The difference in voltage and current sensors reading between the measurement of monitoring system and multimeter measurement was 0.08 Volt and 0.02 Ampere. The percentage of reading error of voltage sensors and current sensors between the monitoring system measurement and multimeter measurement was 0.69% and 5%. The accuracy of the voltage sensors reading was 99.31% and the current sensors was 95%.