The Solar Panel Temperature Derating Sizer calculates proportional loss ratios, geometric root factors, and balance percentages for photovoltaic modules operating under elevated ambient temperatures.

### Mathematical Evaluation & Formulas The tool computes three direct output metrics from three numeric inputs (V1, V2, and V3): - Operating Temperature Loss Ratio: Evaluates parameter 1 multiplied by parameter 2 divided by parameter 3 (minimum denominator 0.01): (V1 * V2) / max(0.01, V3) - Root Product Metric: Computes the square root of the two-parameter temperature product: sqrt(max(0, V1 * V2)) - Proportional Thermal Distribution: Measures the share of parameter 1 across the combined baseline: min(100, max(0, (V1 / (V1 + V2)) * 100%))

Note on Solar Thermal Derating: Standard photovoltaic panels are rated at Standard Test Conditions (STC) of 25°C (77°F) cell temperature. On hot sunny days, rooftop solar cells routinely operate at 45°C to 65°C. Monocrystalline silicon exhibits a negative temperature coefficient of maximum power (P_mp) of approximately -0.35% to -0.40% per °C above 25°C. This online utility evaluates the three-variable proportional arithmetic defined above.

### Numerical Calculation Example Testing thermal parameters with V1 = 45 (operating cell temperature in °C), V2 = 20 (temperature difference over 25°C STC), and V3 = 4 (derate divisor factor): - Operating Loss Ratio: (45 * 20) / 4 = 900 / 4 = 225.00 - Root Product Metric: sqrt(45 * 20) = sqrt(900) = 30.00 - Proportional Thermal Distribution: (45 / (45 + 20)) * 100% = (45 / 65) * 100% ≈ 69.23%

### Local Browser Execution All ratio calculations and square roots execute locally in client-side JavaScript. No panel specifications or thermal readings are sent to external servers.