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* Mod: Calculations reordered based on their usage * Mod: Updated all references to the 2026 NEC * Fix: Some latitude text boxes did not accept negative values * Fix: The "Show favorites at startup" option had no effect * Fix: Air mass index: the angle field is now called "Solar elevation" * Fix: Fill factor: an error message is now shown when the entered values are inconsistent * Fix: Sun position: updated the time zone guide and refined the equation of time coefficients * Fix: Optimal tilt angle: the tilt always stays between 0° and 90°, the sign of the Southern Hemisphere formula has been corrected in the formulas section * Fix: Irradiance on tilted surface: correct results in the Southern Hemisphere * Fix: an error is now shown if the temperature coefficient has the wrong sign * Fix: Compass: the azimuth now refers to true north * Fix: Inclination: the value is correct however the phone is placed on the panel, and a magnetic field sensor is no longer required * Fix: Solar cable ampacity (CEI and IEC): ampacities in buried conduit are now equal to those of a 90 °C cable * Fix: Solar cable ampacity (NEC and CEC): fixed a crash and some ampacity values * Fix: Solar cable size NEC: fixed sizing according to Art. 690.8(B) * Fix: Voltage drop of solar cables calculated with the tinned conductor resistance of IEC 60228 (EN 50618) and, for AWG sizes, with NEC Table 8 * Fix: Corrections to the protective device calculation * Fix: String sizing: added the module maximum power voltage to check the minimum MPPT voltage and corrected the short-circuit current at the cell temperature * Fix: Inverter selection: a single screen valid for all standards (IEC/CEI and NEC/CEC) * Fix: Module inter-row spacing: the support height no longer lengthens the shadow * Fix: Need for SPD: the calculation is split into two tabs, IEC and CEI
THE FUTURE IS SOLAR ENERGY. MAXIMIZE YOUR PLANT'S YIELD. Photovoltaic Calculations is the ultimate app for industry professionals, installers, and renewable energy enthusiasts. Design, size, and analyze every aspect of your solar plant with precision and speed. Get the most out of your solar panels by optimizing every single component simply and instantly! MAIN CALCULATIONS AND SIZING: - Photovoltaic panel yield - Air mass index and fill factor - Sun position and optimal tilt angle - Irradiance on a tilted surface - Solar cell temperature and temperature effect on the module - Integrated tools: compass, inclination, altitude - Solar cable ampacity and cross-section calculation (DC) - Protective device sizing and SPD (Surge Protection Device) requirements - String sizing and short-circuit currents - Ideal inverter selection - Photovoltaic panel decay over the years - Occupied surface area and spacing between module rows - Estimation of daylight hours during the year THEORETICAL AND PRACTICAL RESOURCES: - Series and parallel panel connections - Basic concepts: module, string, and photovoltaic array - Astronomical parameters: solar zenith, solar azimuth, solar declination Everything you need is packed into an intuitive interface, which also includes a VERY USEFUL FORMULARY always at your fingertips. Do not leave efficiency to chance, start designing your perfect solar plant today!