ソーラー歩留まり 監査
PVアレイのエネルギー生産量を予測します。システム損失と地理的な日照密度を考慮した実際的な分析。
システムデータ
アレイサイズと日照時間
系統連系システムでは75% - 80%が一般的です。
パラメータを入力すると、結果はリアルタイムで更新されます。
出力の公式
ソーラーエネルギーの歩留まりは、アレイの定格容量と、あなたの地域が受け取る生産的な日照時間の数によって決まります。
1日あたりのエネルギー歩留まり
kWh/day = kWp × Sun Hours × Eff kWpはキロワット単位でのアレイのピーク電力です。効率(通常0.75〜0.85)は、インバーター、ケーブル、温度による損失を考慮します。
年間歩留まり
Annual kWh = Daily kWh × 365 年間歩留まりを使用して、CO₂オフセット、系統電力コストと比較した節約額、およびソーラー投資の回収期間を計算します。
How to Estimate Solar Panel Output
Knowing how much energy your solar system will actually produce is the foundation of any solar investment decision. The theoretical output of your panels (kWp) is always higher than real-world production — temperature, shading, inverter losses, and dust all reduce actual yield. This calculator applies a realistic efficiency factor to give you an honest production estimate.
Performance Ratio: The Key Metric
Performance Ratio (PR) is the ratio of actual energy output to theoretically possible output — the single best measure of a solar system's real-world efficiency. A well-installed system typically achieves a PR of 0.75–0.85. Losses come from inverter conversion (3–5%), cable resistance (1–2%), soiling (2–5%), temperature derating (5–10%), and shading (variable).
Factors That Affect Solar Output
- Peak Sun Hours: The most location-dependent variable. Phoenix, AZ sees ~6.5 peak sun hours; Seattle, WA averages ~3.5. Use your local solar irradiance data for accuracy.
- Panel Temperature: Solar panels lose approximately 0.4% of output per degree Celsius above 25°C (STC). A panel at 65°C on a hot day produces ~16% less than its rating.
- Shading: Even partial shade on one panel can significantly reduce the output of the entire string in traditional string inverter systems. Microinverters or DC optimizers mitigate this.
- Panel Orientation and Tilt: In the northern hemisphere, south-facing panels at a tilt angle equal to your latitude angle produce the maximum annual yield.
- Panel Degradation: Panels lose approximately 0.5–0.7% of output per year. A 25-year-old panel typically produces 80–85% of its original rating.
Calculating Solar Payback Period
Divide the total installation cost by the annual electricity savings (Annual kWh × electricity rate). A 5kWp system at $10,000 producing 6,500 kWh/year at $0.15/kWh saves $975/year — a simple payback of about 10.3 years, with 15+ years of free energy afterward.