I have 9 PV solar panels on my roof. 7 dry fairly quickly when the sun comes out, but 2 retain droplets of water on them for some time after. They're all mounted in the same plane and the wet ones are next to dry ones.
It looks very odd to me, does this mean anything? I suppose some could have been coated with a rain-x type finish and the others not? Does anyone know if this indicates they're not working or something?