Hi Jeremiah,
Attached is a modified version of your file. I created two cases that are identical exept each uses a different LeadSolar Energy inverter.
The "0.8bifacial DC/AC = 1.9" case uses a 606 Wac inverter with minimum and maximum MPPT voltage ratings of 52-56 Vdc. If the array operating voltage exceeds 56 Vdc, this inverter clips the inverter input voltage to 56 Vdc:
The "0.8bifacial DC/AC = 1.6" case uses a 708 Wac inverter with minimum and maximum MPPT voltage ratings of 50-64 Vdc. This inverter clips the inverter input voltage to 64 Vdc.
You can see the effect of inverter clipping in the results by displaying the following variables in the tables on the Data Tables tab or plotting them on the Time Series tab:
- Subarray 1 Operating DC voltage (V)
- Inverter DC input power (kW)
- Inverter clipping loss DC MPPT voltage limits (kW)
The message on the System Design input page under "Electrical Sizing Information" explains that based on the module's nominal voltage ratings, it is not possible to size the strings to avoid clipping. To avoid clipping, you can choose a module with a rated Voc (open circuit voltage) less than the inverter maximum MPPT voltage rating, or you can choose an inverter with a maximum MPPT voltage rating greater than the module's Voc rating.
Best regards,
Paul.