This article explains how to perform a current correction for irradiance for areas with higher-than-normal irradiance values (>1000W/m²). High-altitude areas typically experience irradiance values greater than the PV module STC since the air is thinner.
Exceeding the Isc and Imp values on the TS4 datasheets will impact the warranty and future RMAs. TS4 datasheets are located in the Tigo Downloads section.
The easiest way to verify Isc and Imp TS4 compatibility in areas with >1000W/m² irradiance values is to use an IV Correction tool found on the Berkely Labs website:
PV Tools IV Curve Correction Tool
For this example, we will use this PV module's electrical characteristics section (left) and compare it to the TS4-A-F datasheet (right).
Enter PV module data:
Use the drop-down menu to find your module. If it is not on the list, click MANUAL ENTRY and enter data using the PV module datasheet.
Click the CALCULATE button in Step 2
Click the 'Generate and Correct I-V Curves' button at the bottom of Step 3:
The tool has generated a corrected IV curve graph with irradiance values of 1100 and 1200W/m².
Hover over the IV curve to the relevant irradiance value to see the corrected Isc and Voc. In this example, the cursor hovers over the chart and shows a Voc of 20.93V and a corrected Isc of 12.07, higher than the STC module datasheet value of 9.75A.
Compare corrected Isc value to TS4 datasheet Isc
|
The corrected Isc for 1200W/m² = 12.07A The TS4-A-F datasheet states an Isc of 20A. This module, at this higher-than-normal irradiance value, still meets the design requirement of being less than 20A. |
And that's it! If you have any questions, please don't hesitate to contact the Tigo Customer Success team se@tigoenergy.com
Related Articles:
How to calculate PV module temperature corrected Voc
How to calculate PV module compatibility for TS4s