Renewable Energy Calculators
Solar PV string length, energy yield and array sizing, wind turbine power and EV charging time calculators with formulas and assumptions.
The solar calculators follow the order a design is usually worked: size the array for a daily energy target, estimate the yield from peak sun hours and performance ratio, and set the string length so the cold-weather open-circuit voltage stays under the system limit. The wind calculator gives the power in the wind and the electrical output after rotor and drive-train efficiency, and the EV calculator estimates charging time and grid energy.
Where to start
- Solar PV Array Size from Energy Need: Array rating and number of modules for a daily energy target.
- Solar PV String Length: Maximum modules in series for the cold-weather voltage limit.
- Solar PV Energy Yield: Daily and annual energy from array size, sun hours and performance ratio.
- Wind Turbine Power: Power in the wind and the electrical output after losses.
All 5 calculators in this category
Solar PV
- Solar PV String Length: Maximum modules in series so the cold-weather open-circuit voltage stays under the system limit. Open in Elecmetric
- Solar PV Energy Yield: Daily and annual energy from array size, peak sun hours and performance ratio. Open in Elecmetric
- Solar PV Array Size from Energy Need: Array rating and number of modules for a daily energy target. Open in Elecmetric
EV Charging
- EV Charging Time: Charging time and grid energy from battery size, state of charge range and charger power. Open in Elecmetric
Renewable Energy
- Wind Turbine Power: Power in the wind across a rotor and the electrical output after Cp and drive-train efficiency. Open in Elecmetric
What these calculators do not cover
String length sets only the upper voltage limit, so also check the inverter MPPT window at hot-weather voltage. Yield depends on the sun hours and performance ratio you assume and is not a site simulation. Shading, soiling and inverter clipping are not modelled separately.
Cross-check: all 5 calculators listed here are compared with 46 reference calculations written separately from the engine. This confirms the arithmetic and selection rules. It does not confirm that a standard table or convention matches your standard or manufacturer data.
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