Wind Power vs Solar Panel Energy
If you are sizing a small renewable system, two numbers matter: how much power a wind turbine can theoretically produce from a given wind speed, and how much energy a photovoltaic array might generate in a year. These calculators answer those two different questions. The wind power calculator works from wind speed, rotor diameter, air density, and efficiency to show instantaneous ideal-power arithmetic. The solar panel energy scenario calculator works from usable roof or ground area, panel geometry, panel rating, and annual specific-yield values you enter to build low and high annual-energy scenarios.
Both are scenario tools: they take values you supply and show the arithmetic consequences, rather than looking up a location, forecasting output, or validating a site. This page compares the two calculators so you can see which model fits the question you are actually asking. It is informational, not an engineering or financial assessment.
What each calculator does
The wind power calculator computes swept area as π times half the rotor diameter squared, theoretical power as half times air density times area times wind speed cubed, and adjusted power by multiplying the theoretical value by the entered power coefficient Cp and efficiency. In the page’s worked example, density 1.225 kg/m³, a 4 m diameter, and 8 m/s give an area of 12.57 m² and theoretical power of 3.94 kW; a Cp of 0.35 with 90% efficiency gives 1.24 kW, and zero wind, Cp, or efficiency gives zero adjusted power. The result is instantaneous power, not annual energy.
The solar panel energy scenario calculator derives a DC capacity screen from geometry: panel count is the floor of usable area divided by area per panel, so only whole panels count, and DC nameplate capacity is that count multiplied by the panel rating. Each annual-energy scenario is the unrounded capacity multiplied by one of your two entered annual specific-yield values, where annual specific yield is annual AC energy divided by DC nameplate capacity in kWhac/kWdc/year. The yield values must come from a named report or assessment and should already include weather, orientation, shading, thermal, inverter, clipping, and availability effects — the calculator adds none of those and applies no performance ratio.
Side-by-side comparison
| Feature | Wind power calculator | Solar panel energy scenario calculator |
|---|---|---|
| Energy source | Wind | Sun (photovoltaic) |
| Question answered | Instantaneous theoretical power (kW) | Annual energy scenarios (kWhac/year) |
| Key inputs | Air density, rotor diameter, wind speed, Cp, efficiency | Usable area, area per panel, panel rating, low and high annual specific yield |
| Core arithmetic | Swept area = π(diameter/2)²; power = ½ × density × area × wind speed³, adjusted by Cp and efficiency | Panel count = floor(area ÷ area per panel); capacity = count × rating; energy = capacity × specific yield |
| Time basis | Instantaneous | Annual |
| Effects modeled | Entered Cp and efficiency only | None — entered yield values carry the effects |
| Built-in coefficients | None | None |
| Output type | Theoretical and adjusted power | Low and high annual-energy scenarios |
When to use which
Use the wind power calculator when your question is about a turbine’s instantaneous power arithmetic — for example, checking how a swept area, wind speed, or efficiency assumption changes the theoretical output — and pair the result with a manufacturer power curve for anything that resembles rating work. Use the solar panel energy scenario calculator when you have documented annual specific-yield values from a named source and want to see what they imply for a whole-panel array on a specific usable area, keeping in mind the result is a screening maximum for capacity, not a physical layout design.
If you are comparing the two technologies for the same site, remember the outputs are on different time bases — instantaneous kilowatts versus annual kilowatt-hours — so convert to a common basis before comparing. Neither calculator looks up your location, forecasts output, or assesses siting suitability.
Where to start
- Wind power calculator — theoretical and adjusted turbine power from wind speed, rotor diameter, air density, Cp, and efficiency.
- Solar panel energy scenario calculator — annual photovoltaic energy scenarios from usable area, panel geometry, rating, and user-entered specific yield.
Informational note: This page is an educational comparison of two generation-estimate worksheets. It is not an engineering design, installation plan, energy forecast, or financial assessment. Real output depends on site conditions, equipment characteristics, shading, maintenance, and regulatory factors these calculators do not model. Consult the equipment manufacturer, a qualified installer, and applicable codes before making decisions.