项目经济性
ROI 与回报周期
摘要
光伏系统节省电费到回收初始投资的时间。
详细解释
Payback period measures how long until solar savings equal the initial investment. In 2026: residential solar payback 5-10 years (US, AU, EU); commercial rooftop 3-6 years; utility ground-mount 7-10 years; off-grid diesel-replacement 2-4 years (best ROI). ROI (Return on Investment) is the total lifetime gain divided by investment. A 25-year solar system with 6-year payback typically has 300-400% lifetime ROI. Key variables affecting payback: electricity price, solar irradiance, net metering policy, tax incentives.