Choohuey Mei Posted August 6, 2020 Share Posted August 6, 2020 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 irradianceThis 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 sayMy PVsyst report shown the value of:Input for mismatch for back irradiance loss: 10%GlobBak: 38 kWh/m2GlobEff: 1742 kWh/m2Bifaciality factor: 0.7Based 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. Link to comment Share on other sites More sharing options...
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