Annual solar power generation kWp × PSH × 365 × PR This is estimated using: installed power, daily equivalent sunshine hours (PSH), and performance ratio (PR). For example, 100 kWp, with a PSH of 4.5 and a PR of 0.8, produces approximately 131,400 kWh/year.

Annual production = kWp × PSH × 365 × PR
Example calculation: 100 kWp, PSH 4.5, PR 0.8 → 100×4.5×365×0.8 ≈ 131,400 kWh/year; specific production ≈ 1,314 kWh/kWp.

Annual Solar Power Generation Estimate

Estimate the approximate annual output of a rooftop/ground-mounted solar power system from installed capacity (kWp), equivalent sunshine hours, and performance ratio.

Annual production
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Specific production
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Annual income
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Notes: Production = kWp × PSH × 365 × PR. PSH (equal sun exposure time) varies by region. (Typical data for Turkey is 4–5 hours; taken from PVGIS/meteorological data). PR (performance ratio) includes temperature, shading, loss, and yield (typically 0.75–0.85). The result is an estimate; exact production will be determined by field study.
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How is it calculated?

  1. Enter the installed power (kWp).
  2. Enter the daily equivalent sunshine hours (PSH) for your region.
  3. Enter the performance rating (PR) and (optional) tariff, then click Calculate.

Frequently Asked Questions

How much electricity does a 1 kWp solar panel produce in a year?
It depends on the region; in Türkiye, typical specific generation is ≈ 1,300–1,600 kWh/kWp/year (depending on PSH and performance ratio).
What is PSH (equal sun exposure time)?
This is the equivalent of the total daily radiation falling on the panel plane in 1 kW/m² hours; it is obtained from PVGIS/meteorological data.
What is the performance ratio (PR)?
This is the efficiency ratio that includes temperature, shading, cable, and inverter losses; typically 0.75–0.85 in well-designed systems.

Related tools and services

This tool and its content are for general informational purposes only; they do not constitute a binding inspection/declaration of conformity. Definitive results will be determined through on-site inspection in accordance with relevant legislation and standards. Get a quote →