I have an 8 panel array rated at 3.3 kWp facing south in central Scotland and on 22 may in full sun it produced a classic bell curve peaking at just over 3kW, 2 days later in cloudy conditions the same installation produced a much shallower ( and erratic) bell curve peaking at about 1.3kW ignoring the odd spike due to sunlight braking through for the odd ten minutes. Therefore from this example of bright sunlight vs low light the panels reduce to some 40% of their best performance due to low light.
Hi!
Solar panels produce less power in low light because there are fewer sunlight photons to convert into electricity. This means both the current and voltage drop, reducing overall efficiency.
Monocrystalline panels usually perform better in low light than other types. Using MPPT charge controllers and keeping panels clean and well-positioned can also help improve output.
While efficiency will always be lower in shade, cloudy weather, or early/late hours, good panel choice and system design can minimize losses.
Let me know if you want tips for your specific setup!