You're right that solar panels rely on sunlight, not heat, to generate power.
However, cooler temperatures help panels perform more efficiently! The drop in performance you're seeing could be due to some factors—dust buildup, shading, or even a slight alignment shift over time.
Since you're in Jo'burg with lots of sunny days.
it might be worth checking for any maintenance issues or monitoring software for insights. Getting those panels cleaned or inspected could make a big difference! ☀️