The answer to this question depends on the following:
- Solar Radiation
- Quality of the Components
- Maintenance
- Output for High Radiation Regions
- Output for Moderate Radiation Regions
- Output for Low Radiation Regions
Solar Radiation
The extent of solar power generation depends on the solar radiation at that location, measured as DNI (direct normal irradiance). DNIs vary from 5.5 kWh/m2/day for high sunshine regions to as less than 3 kWh/m2/day for many regions with low-moderate sunlight.
Quality of Components
Always go for quality panels, inverters and cables. A good quality solar power system could cost 10% higher, but could generate up to 30% more than an average system, all aspects considered, over a 25 year life time.
Maintenance
How frequently you clean your panels and monitor your inverter and other components for repairs can significantly affect generation. For instance, a poorly maintained system can generate up to 25% less power than a well maintained one.
Output for High Radiation Regions
Very high solar radiation regions can generate up to 5 kWh /kW/day on average, or about 1800 kWh per year.
Output for Moderate Radiation Regions
Moderate solar radiation regions can generate in the range 3.5-4 kWh /kW/day on average, or about 1250-1450 kWh per year.
Output for Low Radiation Regions
Regions with low solar radiation could have generations as low as 2.5 kWh/kW/day on average, or just 900 kWh/year from 1 kW. Solar power might not be recommended for regions with solar power generation lower than 900 kWh/year/kW.
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