I’ve been concerned that I wasn’t getting maximum wattage generation and that maybe I had a bad panel or wiring problem. While troubleshooting I took voltage measurements from each panel in good Arizona sunshine.
All of the panels except one of the 100 w panels would cause the meter to jump around a bit and then just long enough to see it display ~12v then ~18v, then the display would clear and then display a 1 to the far left.
The outlier 100w panel would immediately measure ~18.5v and the meter would hold that value on the screen.
This isn’t me not holding good contact with the probes. No way could that be the case consistently across the same panels over and over again.