免费太阳能电池板计算器
估算安装太阳能电池板的发电量和节省费用。
Panels Needed
19 panels
Panels Needed vs Monthly Electricity Usage
公式
## How to Calculate Solar Panel Needs Sizing a solar system depends on your energy consumption, local sunlight, and panel efficiency. ### Formula **System Size (kW) = Daily kWh / (Sun Hours * System Efficiency)** **Panels Needed = System Size * 1,000 / Panel Wattage** Peak sun hours vary by location: 4-5 hours in the northern US, 5-7 in the south and west. System efficiency accounts for inverter losses, shading, and panel degradation.
计算示例
A home using 900 kWh/month in a location with 5 peak sun hours, using 400W panels at 80% efficiency.
- 01Daily usage: 900 / 30 = 30 kWh/day
- 02System size: 30 / (5 * 0.80) = 7.5 kW
- 03Panels needed: ceil(7,500 / 400) = 19 panels
- 04Annual production: 19 * 400 / 1000 * 5 * 365 * 0.80 = 11,096 kWh
常见问题
How many solar panels does a typical home need?
The average US home uses about 900 kWh/month and needs 15-25 panels depending on location, panel efficiency, and roof orientation.
What are peak sun hours?
Peak sun hours represent equivalent hours of full-intensity sunlight per day. Phoenix averages 6.5, New York about 4.5, and Seattle about 3.5 peak sun hours.
How much roof space do I need?
Each 400W panel is about 21 sq ft. A typical 8 kW system (20 panels) needs roughly 420 sq ft of unshaded south-facing roof.