The spacing of photovoltaic brackets is usually between 2. This is to ensure that the front and rear rows of brackets will not block each other's shadows, thereby ensuring the light utilization rate of photovoltaic modules.
The ratio of the light energy that passes through the transparent cover and is absorbed at the black surface to the light energy landing on the panel gives one measure of the efficiency of the panel, the so called "optical efficiency" or "zero-loss efficiency".