Hi, I am conducting an experiment whereby I have to measure the individual performance (on a per-cell basis) of solar cells on a solar panel. The panel has 20 cells, which are 4 strings in parallel of 5 cells in series each. The entire panel has a +V and chassis GND wire that I can open or close. I have the solar panel positioned in front of a high power LED to ensure that it gets roughly the same amount of light. (I am not looking for raw cell performance, but, rather, before/after tests). What is the best way to hook up a multimeter to an individual cell so I can figure out how much it has degraded? I am hitting these solar cells with things, and seeing how they perform after cracked. Do I need to sever the electrical connections between them so the results are not skewed? The attached picture shows what I am doing. I am not even sure what the best way of evaluating the health is. Should I be measuring with different resistances so I can get some kind of rudimentary IV curve? I do not know the intensity of the controlled light setup and I have no way of finding out what the intensity is, either. All I know is that it is the same. I am thinking that all I can do is get a good idea for how the voltage/current changes before/after damage.