choose your city and capacity，estimate PV plant first-year and 25 annual generation、equivalent household consumption and carbon reduction。free、no registration required。
first-year generation = installed capacity(kW) × city annual utilization hours（kWh/kWp·year，already includes system efficiency and shading derate）。25 annual generationby annual module degradation 0.5% multiply and sum；equivalent householdby each household annual consumption 3000 kWh estimate；carbon reductionper kWh offset grid emissions 0.5703 kg CO₂ calculate。
annual utilization hours already embed regional irradiance differences；actual generation also depends on orientation、tilt angle、shading and soiling affect，results are near the theoretical upper bound。want to know how many years this system takes to pay back，can use the same station's「Rooftop PV Payback Calculator」。