julmou Posted May 29, 2022 Share Posted May 29, 2022 Good morning, I was reading this post in the FAQ from 2012 by Andre Mermoud: https://forum.pvsyst.com/topic/83-can-i-define-a-system-with-2-orientations-on-a-same-inverter/ Quote However when putting modules of a same string in 2 different orientations leads to a the mismatch in current (due to different irradiances), which may be very important. This would be a very bad system and PVsyst doesn't allow it. This configuration would only be acceptable when using optimizers performing MPPT at the module level, but this is not yet implemented in PVsyst. However, I do know of some installations in Perth in Australia, with different orientations on the same string(for example, when the roof facades are pretty small and there are only 3 modules on one side -> this is not enough in terms of voltage to make it a separate string, hence, it's connected with the other roof side which has 8 modules for example, making it a "polystring" of 11 modules with mixed orientation). I acknowledge that this might be a bad design, however, sometimes the house constraints don't allow another option, and it would still be interesting to know the production and the losses in that situation, and be able to compare a variant with just the 8 modules on a single orientation vs. the 11 modules with mixed orientation, and see what's the benefit. Finally, we are asked more and more to design systems with SolarEdge optimizers and inverters, it would be interesting if we could simulate a single string with mixed orientation and optimizers. Any update on this? Link to comment Share on other sites More sharing options...
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