UK owner’s three dark solar cells prompt online fault theories

A UK owner found three darkened cells on a two-year-old, ground-mounted DMEGC panel that still produced power. Reddit commenters raised microcracks as a possible cause and urged checking the busbars, but the owner could not tell whether output had fallen.

The owner reported no cracks visible on either side. Cloudy weather made production hard to assess, and the panel was wired in series with another module; they planned to test it separately in full sun.