Mismatch Loss
Energy lost when panels in a string have different output levels due to manufacturing variation, uneven shading, soiling, or degradation. The weakest panel limits the entire string.
Why It Matters
Mismatch is why microinverters and power optimizers exist — they allow each panel to operate independently, eliminating the weakest-link problem.
Related Terms
Microinverter
A small inverter attached to each solar panel, allowing independent operation and optimization of each panel.
Power Optimizer
A DC-to-DC converter installed behind each solar panel that maximizes the output of individual panels before sending power to a central string inverter.
String Inverter
A central inverter that connects to multiple solar panels in series (strings). Less expensive than microinverters but less flexible.