Renewable Energy
Solar Panel Output Calculator
Daily and annual energy from a solar array, from panel wattage and local sun hours.
daily kWh = array kWp × peak sun hours × …
Also called solar output calculator · pv generation calculator
Energy & Environment · 9 calculators
Renewable Energy Calculators
Solar and wind energy production, capacity factor, renewable share, payback and carbon savings.
Renewable Energy
Wind Power Calculator
Power available in the wind and what a turbine can extract, from rotor size and wind speed.
P = ½ρAv³ × Cp × efficiency
Also called wind turbine power · wind energy calculator
Renewable Energy
Energy Savings Calculator
Savings from an efficiency upgrade, with payback period and lifetime return.
saving = current use × reduction % × rate
Also called efficiency savings calculator · energy upgrade payback
Renewable Energy
Solar Payback Calculator
How long a solar installation takes to pay for itself, with the 25-year net return.
payback = install cost ÷ annual saving (w…
Also called solar roi calculator · solar break even
Renewable Energy
Solar Battery Calculator
Battery storage size for a solar system, based on evening use and days of autonomy.
kWh = evening use × days ÷ DoD ÷ round-tr…
Also called solar storage size · home battery for solar
Renewable Energy
Capacity Factor Calculator
Capacity factor of any generator — actual output against its theoretical maximum.
capacity factor = actual output ÷ (rated …
Also called plant capacity factor · load factor calculator
Renewable Energy
Renewable Percentage Calculator
What share of your energy comes from renewable sources, and what is needed to reach a target.
share = renewable ÷ total × 100
Also called renewable share calculator · green energy percentage
Renewable Energy
Carbon Savings Calculator
CO₂ avoided by renewable generation or efficiency, expressed in trees and car miles.
kg CO₂ = kWh × grid carbon intensity ÷ 10…
Also called co2 saved calculator · carbon offset calculator
Renewable Energy
Solar System Size Calculator
Solar array size in kWp needed to cover a given share of your electricity use.
kWp = target kWh ÷ (sun hours × 365 × der…
Also called what size solar system · kwp calculator
Key renewable energy formulas
| Solar Panel Output | daily kWh = array kWp × peak sun hours × derate factor |
|---|---|
| Wind Power | P = ½ρAv³ × Cp × efficiency |
| Energy Savings | saving = current use × reduction % × rate |
| Solar Payback | payback = install cost ÷ annual saving (with escalation and degradation) |
| Solar Battery | kWh = evening use × days ÷ DoD ÷ round-trip efficiency |
| Capacity Factor | capacity factor = actual output ÷ (rated capacity × hours) |
| Renewable Percentage | share = renewable ÷ total × 100 |
| Carbon Savings | kg CO₂ = kWh × grid carbon intensity ÷ 1000 |
| Solar System Size | kWp = target kWh ÷ (sun hours × 365 × derate) |
Renewable Energy questions
What are peak sun hours?
The number of hours per day equivalent to full 1,000 W/m² sunshine. It bundles the whole day’s irradiation into one number.
Why does doubling the wind speed give eight times the power?
Power depends on velocity cubed — 2³ = 8. That is why a windy site beats a bigger turbine on a calm one.