Hi André Mermoud, (1) if you check "default", it will usually be -0.8%; actually -0.75% per your definition for the V6 version software, for solar panel with 0~3% tolerance, will get -3%/4 of this factor. (2) however, most recent solar panel is categorized each 5W, even this case, it says 0~5W tolerance. therefore, I believe, it is better for this case, to have -5W/300W/4=-0.4% for the same reason you have above; (3) and with Isc current sorting in the installation (within the same category of 5W, solar panel are divided to three current bins by current), we are able to get out the average 2.5W beyond 300Wp, therefore, we would like to use -2.5W/300W=-0.8% as this factor once we do current sorting. Please let me know your comment. And actually, I don't understand why you set "-half of the lower tolerance" in version 5, and "a quarter of the difference between these values" in version 6. That's really confusing. Ping Xi.
