From HeatSpring.com PV Boot Camp Discussion Board
Is there any more sophisticated and faster ways of analyzing strings rather than an IV Curve tracer? This method seems time consuming since it involves disconnecting the system and evaluating each string. Are there any new methods of evaluating PV systems with new 'non contact' sensors?
The IV curve is effective. They could make built in IV curve tracers for every string or even every module, but it is not cost effective yet.
Another way to check modules is with an infrared camera. There will be hot spots where the modules are not working. You can find broken diodes and disconnected strings this way.
This has to do with thermodynamics. A PV that is not sending energy elsewhere will be hotter.