Reviving old thread, but I don't think this would be a very accurate way of modeling this issue. As I'm getting higher production total with less total DC nameplate(assuming due to the virtue of multi mppts helping with mismatch between shaded/unshaded sections)
In reality the string/s of different wattage module would negatively impact a combiner due to the mismatch of overall Vmp.
Unless there is something I'm not thinking about.