Inspection of Solar Photovoltaic systems with drone-based visible and infrared (IR) sensors can identify defects that contribute to underperforming and non-performing elements of a solar panel array. With large commercial and utility size systems with a high concentration of PV panels in one location, the benefits of this type of inspection is readily apparent. It is with small residential systems that the cost benefit analysis of this type of inspection is less clear. The performance loss at the site level may not warrant immediate troubleshooting or repair. However, when defects and their associated performance degradation are aggregated at the PPA / Lease portfolio level the financial impacts become significant over the life of the portfolio. The defects that these inspections can find range from cell, to panel, to string level issues. Another loss that can be found is by generating a drone-based shading report for a snapshot of current shading that can be compared to the original shading values from the installation. A cell level issue may only incur a low wattage loss that would not justify repair or replacement of the panel. When the defects are causing losses at the panel and string level of the system they can significantly impact the annual kWh performance of the system. When the dollar value of the kWh loss and SREC loss is taken into consideration over a 15 - 20 life cycle of the system the financial impact can surprisingly large. The aggregated losses over a whole portfolio of systems can then be significant over the performance period of the portfolio. The Pareto principle tells us that 80% of the losses identified with these inspections will reside with 20% of the systems. With the inspection and loss data generated management can then make informed decisions to prioritize repairs based on the impacts on the portfolio as a whole. String and system level defects, with large losses, can be addressed first. Lower priority items can be scheduled based on location and availability of a repair crew sometime in the future. Or groups of geographically adjacent systems can be bundled together and bid out for repair with reduced deployment costs. Regardless, management can now make informed decisions on how to approach these issues.