Quick Answer
Local climate significantly affects solar panel temperature coefficient values, with hotter climates resulting in higher derating factors. This is due to reduced efficiency at higher temperatures. Temperature coefficient values can vary by up to 0.5%/°C.
Temperature Coefficient Impact
When evaluating solar panel performance, temperature coefficient values play a crucial role in determining actual output. These values measure the decrease in efficiency as temperature increases. In hot climates, solar panels can operate at temperatures above 40°C, leading to significant derating. For example, a panel with a -0.4%/°C temperature coefficient will experience a 16% decrease in efficiency if operating at 50°C instead of 25°C.
Climate Zones and Temperature Coefficient Values
Different climate zones have varying temperature profiles, which impact temperature coefficient values. In tropical regions with high temperatures and low humidity, panels may experience higher derating factors. In contrast, temperate regions with moderate temperatures and high humidity may have lower derating factors. To account for these variations, manufacturers often provide temperature coefficient values specific to different climate zones, such as -0.45%/°C for tropical regions and -0.35%/°C for temperate regions.
Derating Factor Calculation
To calculate the derating factor, multiply the temperature coefficient value by the temperature difference between the operating temperature and the reference temperature (typically 25°C). For example, if a panel has a -0.4%/°C temperature coefficient and operates at 45°C, the derating factor would be -0.4%/°C * (45°C - 25°C) = -10%. This means the panel’s actual output would be 10% lower than its rated capacity at 25°C.
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