The electricity generated by a single solar cell depends on its power capacity and the environmental conditions where it is installed. Here's a basic explanation:
1. Power Capacity of Solar Cells
Commonly used solar cells today have:
300–450 watts for residential use
500–600 watts for factories or large-scale projects
2. Daily Power Generation
The electricity output depends on the peak sun hours (PSH) available, which is around 4–6 hours per day in Thailand.
Example Calculation:
A 400-watt solar cell × 5 hours = 2,000 watt-hours (2 kWh) per day
A 550-watt solar cell × 5 hours = 2,750 watt-hours (2.75 kWh) per day
3. Annual Power Generation
If a solar cell receives an average of 5 peak sun hours daily throughout the year:
400-watt solar cell → 400×5×365=730 kWh/year400 \times 5 \times 365 = 730 \, kWh/year400×5×365=730kWh/year
550-watt solar cell → 550×5×365=1,003 kWh/year550 \times 5 \times 365 = 1,003 \, kWh/year550×5×365=1,003kWh/year
4. Factors Affecting Electricity Generation
Orientation and Tilt: Solar cells facing south at the optimal angle generate the most electricity.
Weather Conditions: Cloudy or rainy days can reduce output by 30–50%.
Temperature: Excessively high temperatures may decrease efficiency.
5. Easy-to-Understand Summary
A 400-watt solar cell can generate about 2 kWh/day or 730 kWh/year in areas with 5 peak sun hours daily.
A 550-watt solar cell can produce approximately 2.75 kWh/day or 1,003 kWh/year under similar conditions.
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