Kamil Jeznach Posted October 25, 2018 Report Share Posted October 25, 2018 Hi. Is it possible to calculate shading losses for whole string of modules? I'll give you example: - 10 modules, 9 of them no shading 0%, 1 of them has 99.7% (1 modul is under additional roof): - I would expect 100% losses due to 1 string connection. The thing is that simulation calculates it as only 10% loss! In reality I'll have 0 kWh, on the simulation results I have 2500 kWh. Any idea how to force PV Syst to calculate string shading insted of one module shading? Quote Link to comment Share on other sites More sharing options...
developer_mh Posted October 26, 2018 Report Share Posted October 26, 2018 Hi Kamil, I think the problem here is that the one module under the roof which has 100% direct shading perhaps isn't considered correctly regarding the diffuse shading, which should also be 100%. Could you send me the project file? But in general, what happens if you have a string connection like the above is that all modules are forced down to the i v curve from the diffuse irradiance, which is not 0. This is why you don't get 0 kWh output. All bypass diodes of the shaded module would be active so that you loose a bit additional energy (current from the other modules * diode voltage), but you'll still get energy out of the string. You can also have a look here: https://help.valentin-software.com/pvsol/2018/calculation/pv-field/ Hope that helps, kind regards. Martin Quote Link to comment Share on other sites More sharing options...
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