During solar panel inspection, which irradiance value would likely be considered insufficient if the minimum is 600 W/m^2?

• A. 300 W/m^2
• B. 500 W/m^2
• C. 700 W/m^2
• D. 800 W/m^2

Answer: (B)

Irradiance levels set the light input for solar panel testing, and there’s a minimum value to ensure the panel is tested under adequate illumination. If the minimum is 600 W/m^2, any irradiance below that fails to meet the required test conditions and is considered insufficient.

Among the options below 600 W/m^2, 500 W/m^2 is the closest to the threshold, so it’s the one most likely to be labeled insufficient in a standard inspection. The value 300 W/m^2 is also below the minimum, but it’s farther from the cut-off. Values above 600 W/m^2 (700 and 800) meet the minimum and would be considered sufficient.

So, 500 W/m^2 is the best choice because it fails to meet the required minimum while being the closest undershoot.