Abstract: The present disclosure provides a system and method for monitoring performance of a photovoltaic array. The system and method reduces the need for monitoring equipment by collecting measurement data associated with a plurality of photovoltaic strings. Failure and performance degradation detection is improved through the use of monitoring conditions, performance thresholds, and auto-calibration. Various user interfaces enable a user to modify or adjust the monitoring system and method, as well as monitor the performance of a photovoltaic array.