太阳能电池板计算器 — 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.
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.
- Daily usage: 900 / 30 = 30 kWh/day
- System size: 30 / (5 * 0.80) = 7.5 kW
- Panels needed: ceil(7,500 / 400) = 19 panels
- Annual production: 19 * 400 / 1000 * 5 * 365 * 0.80 = 11,096 kWh