Cell-to-Module Ratio for ETFE Modules: Why 33 Solar Cells Don’t Add Up to the Nameplate

An OEM buyer wrote to us with a fair question: the cell spec said 26.2%, the panel held 33 half-cut cells, so why did the label read 130 W instead of 144? Nothing was wrong with the panel. The gap is the cell-to-module ratio, and knowing how to read it separates careful suppliers from careless ones.