Heat Reduces Solar Power: Temperature Effects on PV Performance

Temperature has a profound impact on photovoltaic performance. As module temperature rises, voltage decreases due to changes in semiconductor behavior. This causes the I-V curve to shift left, reducing the maximum power point.

While current increases slightly with temperature, the voltage loss dominates, resulting in lower overall power output. This explains why solar systems may underperform on very hot days despite strong sunlight.

Understanding temperature coefficients is essential for inverter sizing, string design, and predicting seasonal energy yields.