Thermal imaging has many uses in PV system O&M, both for preventive maintenance and as a troubleshooting tool. The fundamentals of thermography are the starting point; from there applications include imaging of terminations to look for high resistance and overheating, inspection of electrical equipment, and troubleshooting, followed by guidance from existing standards on how to respond to issues that are found.

Unique to our industry is using thermal imaging to inspect PV modules. Information can be obtained rapidly, and in fact aerial thermography – either via drone or human-piloted aircraft – has become a preferred means of inspecting PV arrays on large systems, dramatically reducing the time spent on the ground trying to find issues through other means. Hand-held use, while difficult at a large scale, is particularly useful for pinpointing issues and troubleshooting. Typical failures and their heat signatures are a key takeaway, as well as recommended actions based on severity.