Solar Power Calculator

Estimate annual power generation from panel area, tilt angle, latitude, and solar irradiance — free renewable energy tool

Related Categories:Building Services

Panel Input Method

Number of Panels

Wattage per Panel (W)

System Capacity: 2.40 kW

Peak Sun Hours

Peak Sun Hours (kWh/m²/day)

Region Presets

System Losses

Inverter Efficiency (%)

Wiring Efficiency (%)

Soiling Factor (%)

Degradation (%)

Overall System Efficiency: 89.4%

Electricity Rate

Electricity Rate (JPY/kWh)

Generation Estimates

Daily

8.2

kWh

Monthly

248

kWh

Annual

2975

kWh

Annual Savings

¥89,254

Calculated at 30 JPY/kWh

CO2 Reduction

1312.0 kg-CO2/year

= 1.312 t-CO2/year

Equivalent to the annual absorption of about 94 cedar trees

Formula

Annual Generation = Capacity (kW) x PSH (h/day) x 365 x Losses

= 2.40 x 3.8 x 365 x 0.8938

= 2975.1 kWh/year