How Temperature Affects Solar Modules

Here is an explanation I found on the web that is very helpful.  This helps explain why Toronto, Ontario, Canada can produce reasonable solar power when compared to Miami, Florida which is further south and one would expect have greater solar power generation potential.  This is a bit technical but worth the read.

A 300 W– rated module at 25°C and an irradiance of 1,000 W/m2  generates 300 W of power. If irradiance is constant but ambient temperature increases, causing cell temperatures to reach

50°C, the same module (assuming a -0.43%/°C temperature coefficient) now produces only 268 W of power (300 W x [1 + (50°C - 25°C) x -0.43%/°C] = 268 W).

 Modules using standard crystalline PV cells have a temperaturecoefficient of about -0.45%/C, meaning that a 1°C increase in operating cell temperature decreases power output by 0.45%. Use of these advanced cells can reduce the coefficient to -0.43%/°C, or even -0.41%/°C.