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RELEASE 12.35.0

November 12, 2026

PlantPredict

New Spectral Mismatch Model: First Solar Spectral 3.0

First Solar Spectral 3.0, First Solar’s latest spectral mismatch model for CdTe modules, can now be selected from the Spectral dropdown in Environmental Conditions. It corrects for precipitable water, air mass, and clear-sky index, using six coefficients (B0 to B5) that are shown and editable once the model is selected.
Spectral dropdown in Environmental Model Controls, open with First Solar Spectral 3.0 highlighted

First Solar Spectral 3.0 in the Spectral dropdown, under Environmental Conditions

Spectral 3.0 currently only applies to CdTe modules. When the First Solar Spectral 3.0 model is selected, DC fields with other module types fall back to the 2-parameter model when the module has 2-parameter coefficients, and to the 1-parameter model otherwise.

Improvements and Bug Fixes

  • PVsyst import, inverters with several MPPT inputs — Each MPPT input was imported as a full-size inverter, using the design derate to limit its power. Each input is now imported as a “fractional” inverter—sized from PVsyst’s power sharing values or split evenly when power sharing is off—and all inputs of one inverter share the same transformer.
  • PVsyst import, weather files — Small negative irradiance readings at night are now set to zero with a warning, instead of the weather file being refused.
  • PVFARM import
    • The import file size limit has been raised from 256 MB to 1 GB (uncompressed data), so large projects (> 1 GW) now import.
    • In the 3D shade scene, terrain-following trackers are now built from their individual bays (= tracker sections) so they follow the ground, instead of one flat plane per tracker. Trackers rotated 180° on a slope no longer have their slope reversed.
    • Imported plants no longer fail to save because of out-of-range inverter efficiency or row spacing values, and a generated inverter now falls back to the Euro efficiency when the file has no usable CEC or maximum efficiency.
  • OND import — When an OND file does not include all of the inverter’s temperature derating points, the curve is now imported as given, instead of filling the missing points with 0 kVA.
  • Import error messages — When importing a power plant configuration, error messages are now clearer if the uploaded file (PVsyst project ZIP or PVC2 file) is invalid.