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Solar Production Calculator

Forecast Your Energy Generation

Estimate daily, monthly, and yearly solar energy production based on your system size and sun hours.

Tip: enter measured/known sun-hours for more accurate results (city or site specific).
Default includes inverter, wiring & soiling losses. Typical 0.70–0.80.
Optional: add simple month-to-month variation for a more realistic monthly curve.

Estimated Production

Daily Production: kWh/day

Monthly Production: kWh/month

Annual Production: kWh/year


Production per kW: kWh/year per kW

Estimated losses (derate applied): %

The calculator uses: Daily = system_kW × sun-hours/day × derate. Monthly uses days-per-month, annual uses 365 days.

Solar Production Calculator – Forecast Your Energy Generation

Estimate daily, monthly, and yearly solar energy production based on your system size and sun hours.

Our interactive calculator helps you predict how much electricity your solar system can produce. Enter your system details and location profile to see accurate production estimates.

Why Calculate Solar Production?

Knowing how much energy your solar system can produce helps you make smarter decisions before and after installation. This calculator gives you:

  • Daily, Monthly & Annual production forecasts
  • Customized results based on sunlight profile or exact sun hours
  • Charts & insights for better planning
  • Comparison of production vs losses

How Our Solar Production Calculator Works

  1. Enter System Size (kW): Add the capacity of your solar system.
  2. Select Sunlight Profile (Good, Average, Poor): Quick estimate based on general conditions.
  3. Or Enter Custom Sun Hours: If you know your location’s average daily sunlight, enter it — it overrides the profile.
  4. Adjust Performance Ratio: Default 0.75 accounts for inverter, wiring, and dust losses.
  5. View Results Instantly: Get daily, monthly, and annual energy production with clear charts.

Benefits of Forecasting Solar Production

  • Accurate Planning: Estimate your system’s performance before investment.
  • Energy Independence: Know how much of your usage can be covered by solar.
  • Optimized System Size: Avoid oversizing or undersizing your solar system.
  • Better ROI: Plan electricity savings and payback period confidently.

Plan Smarter with Solar Energy

Use this free calculator to forecast your system’s production and savings potential. Ready for a complete system design? Get in touch with our solar experts today.

Get Free Solar Consultation

Why Trust Our Solar Production Calculator?

  • Based on standard solar PV calculation models
  • Includes realistic derating factors for accuracy
  • Designed by solar professionals for real-world usage
  • Clear results with visual charts and numbers

Frequently Asked Questions (FAQ)

How accurate is the Solar Production Calculator?

Our calculator uses standard PV models with realistic derating factors. Custom sun hours improve accuracy further.

What is the difference between Sunlight Profile and Custom Sun Hours?

Sunlight Profile gives quick estimates (Good, Average, Poor). Custom Sun Hours provide precise results for your location.

Does the calculator include seasonal variations?

Yes, you can enable seasonality to see monthly variations in solar production.

Can I use this tool for any location?

Yes, the calculator works globally. Just enter your system size and average daily sun hours.

Does this calculator show financial savings?

No, this tool focuses on energy forecasting. Use our Solar Carbon & Savings Calculator for financial insights.

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