7 Things You Need To Know About Solar Panel Ratings
Solar Panel STC Rating
Temperature 25 degrees C
NOCT solar panel rating standards are much more realistic - actual wattage output is around 25% less than the normal rating!
Solar Panel tilt angle affects the output. About 45% is good - adjusting by season is better.
Solar panel direction has an effect on output
Due South (in the Northern hemisphere) is optimum. South-East and South-West are OK, but never North!
Auto-tracking (following the sun across the sky) increases energy output
Excess heat affects solar panel output
Clean those panels!
Regular cleaning can increase electricity generation by 10% to 25%