Choohuey Mei

1.Under the P50-P90 estimation - meteo variability. Which is to be selected and what are the meaning for "kind of data" What are the differences for "monthly average" and "TMY, multi-year" 2.what it mean for "annual variability" A project with tracker vs. Fixed tilt. What is the typical value to be considered and which will be highigher?

Hi, I am trying to calculate the value for "mismatch for back irradiance" based on the formula and explanation as following: https://www.pvsyst.com/help/bifacial_results.htm _________________________________________________________________________________________________________ "MismBak Mismatch for back irradiance This is the result of the Mismatch parameter specified by the user (see Bifacial Procedure) At this stage of the Array losses, on the results diagram this is referred as percntage of the full system energy. As an example, if you have specified a loss of 10% (of the bi-facial contribution), and you have a bi-facial contribution of 15% of GlobEff, this will be 10% of GlobBakEn / (GlobBakEn + GlobEff). NB: Here the GlobBakEn is GlobBak * Bifaciality factor" _________________________________________________________________________________________________________ Lets say My PVsyst report shown the value of: Input for mismatch for back irradiance loss: 10% GlobBak: 38 kWh/m2 GlobEff: 1742 kWh/m2 Bifaciality factor: 0.7 Based on the paragraph: GlobBakEn = GlobBak x Bifaciality factor = 38 x 0.7 = 26.6 kWh/m2 "Mismatch for back irradiance" as show in the loss diagram over the whole year = 10% of GlobBakEn / (GlobBakEn + GlobEff) = 10% of [26.6/ (26.6+1742)] =0.1504% I cannot get the value as per the loss diagram, as my PVsyst loss diagram show the value is 0.21% I only get it with further divide by 0.7 = 10% of [26.6/ (26.6+1742)] /0.7 =0.2149% Appreciate for your advice.

Hi, I am trying to calculate the value for "mismatch for back irradiance" based on the formula and explanation as following: https://www.pvsyst.com/help/bifacial_results.htm _________________________________________________________________________________________________________ "MismBak Mismatch for back irradiance This is the result of the Mismatch parameter specified by the user (see Bifacial Procedure) At this stage of the Array losses, on the results diagram this is referred as percntage of the full system energy. As an example, if you have specified a loss of 10% (of the bi-facial contribution), and you have a bi-facial contribution of 15% of GlobEff, this will be 10% of GlobBakEn / (GlobBakEn + GlobEff). NB: Here the GlobBakEn is GlobBak * Bifaciality factor" _________________________________________________________________________________________________________ Lets say My PVsyst report shown the value of: Input for mismatch for back irradiance loss: 10% GlobBak: 38 kWh/m2 GlobEff: 1742 kWh/m2 Bifaciality factor: 0.7 Based on the paragraph: GlobBakEn = GlobBak x Bifaciality factor = 38 x 0.7 = 26.6 kWh/m2 "Mismatch for back irradiance" as show in the loss diagram over the whole year = 10% of GlobBakEn / (GlobBakEn + GlobEff) = 10% of [26.6/ (26.6+1742)] =0.1504% I cannot get the value as per the loss diagram, as my PVsyst loss diagram show the value is 0.21% I only get it with further divide by 0.7 = 10% of [26.6/ (26.6+1742)] /0.7 =0.2149% Appreciate for your advice.