baohua

Hi I am evaluating the bifacial module mismatch loss, because I used the irradiance=front irradiance+ rear irradiance*bifaciality factor as input (same logical like PVyst), so I can get the total mismatch loss. I want to know how does PVsyst calculate back side mismatch loss factor to the total energy yield？ based on PVsyt calculation method, I can reverse calculation the back side mismatch loss factor for bifacial system, and this would be very helpfull to guide PVsyst users to input this value. Thank you very much! Baohua

Got it, Thanks!

Hi When I am importing minutely measured climate data to PVsyst , no data can be translated to PVsyst data since version 6.67. please see the below pictures. Could you help to solve this problem? Thanks! Baohua

Hi I noticed this new loss since the version of 6.64. As my anderstanding, when the high current designed module combined with high irradiance, the Impp of array is bigger than inverter max input curren, array will works at inverter max input current, so the array will wokrs at non-Mppt, this would lead to power loss due to high current, am i understanding right? or could you help to explain how to calculate this loss? Thanks! Regards Baohua

Understand, I will try this feature based on module layout shading scenario. thanks, :)

Hi PVsyst gives the possibility of specifying Dual Cell: due cell definition in Pan file but according to my verification, this definition can not affect the shading simulations or shading loss calculation tool? could you tell me what specific part it affects the calculations. Thanks! Regards. Baohua.

Hi when I using mismatch tool for module level evaluation, please see the below picture(Pmax loss =-7099.9%), could you help to check if something wrong with the inputs or the model itself? thanks. Error

Hi Andre, I also met the same problem with Sebastian, the simulated bifacial gain was significant lower than some actual test results. for example, bificality=0.9, albedo=0.7 distance from ground to module=1m, finally got the bifacial gain =11.4%. compared to the acutal test results, including utility scal system. please see http://hokkaidopvgs.jp/wp-content/uploads/2017/01/41c7223bd0545a0f4dbe8fbccbc00572.pdf , 1.25MW capacity system in japan, bifacial gain about 20%. some other test results are shown a big bifacial gain in actual test. ISC also summaried some test results, at least more than 10% bifacial gian. measured results summary I think the bifaical model should be improved a little, to make it more aline with the actual result . Thanks, Baohua

Hi, I'm an engineer from a module manufacturer, we are preparing to release the Pan file based on the new module layout which using the half cell technology, and now we meet one problem that is the module layout in PVsyst just has the options of how many cells in parallel and how many cells in series, but actually for the half cell module layout, the circuit layout is "in series-in parallel-in series", you can refer to the attachment, as you know the module layout has a big impact on the shading loss and hot spot temperature behavior, so how can I set the accurate module layout in PVsyst? Thanks Baohua.