Pablo HM Posted February 16 Share Posted February 16 If we start with a base of 715 kWh/m2 incident on ground and we apply all losses and gains that appears in the Sankey diagram attached, we obtain an effective Global Irradiance on rear side on collectors of 60,96 kWh/m2. There is a lot of discrepancy between both results. If we do the same calculation for the front side, we don't have any problem. Why is this happening? Do we have to consider anything else as configuration 1P, 2P... or other variables? Link to comment Share on other sites More sharing options...
Pepe Rod Posted February 16 Share Posted February 16 It happens exactly the same to me. I have not been able to find an explanation. Link to comment Share on other sites More sharing options...
tanzale33 Posted February 29 Share Posted February 29 a small world cup On 2/16/2024 at 6:43 PM, Pablo HM said: If we start with a base of 715 kWh/m2 incident on ground and we apply all losses and gains that appears in the Sankey diagram attached, we obtain an effective Global Irradiance on rear side on collectors of 60,96 kWh/m2. There is a lot of discrepancy between both results. If we do the same calculation for the front side, we don't have any problem. Why is this happening? Do we have to consider anything else as configuration 1P, 2P... or other variables? They can represent different panel installation configurations that affect rear radiation. For example, a single axis tracker (1P) may have different shading and reflection characteristics compared to fixed tilt (2P) or other installations. Link to comment Share on other sites More sharing options...
Michele Oliosi Posted March 7 Share Posted March 7 The discrepancy is because the area is not the ground anymore, but the module area. With a GCR of about 50%, 1 m^2 of ground is about 0.5 m^2 of module backside area. Proportionally, the energy per unit area is doubled. Link to comment Share on other sites More sharing options...
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