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CONSTRUCTION TOOL

Solar Panel Calculator

Estimate annual solar generation, electricity value and simple payback using your local yield estimate.

Solar Panel Calculator

FREE ONLINE TOOL
Formula and assumptions

Annual generation = system kW × local yield; annual value = min(generation, use) × rate; simple payback = cost ÷ annual value.

Yield, self-consumption, prices and installed cost are user inputs. Assumes generated energy up to annual use offsets purchases; excludes export credits, seasonality, degradation, finance, incentives and maintenance. Not an installation design or savings guarantee.

350 kWh/month, 3 kW, 1,500 kWh/kW/year, rate 0.20, cost 1,500/kW: 4,500 kWh/year, value 840/year, payback 5.36 years.

STEP BY STEP

How to use solar panel calculator

  1. Check the input units and assumptions.
  2. Review the result and example.

IN PRACTICE

Example

350 kWh/month, 3 kW, 1,500 kWh/kW/year, rate 0.20, cost 1,500/kW: 4,500 kWh/year, value 840/year, payback 5.36 years.

GOOD TO KNOW

Which formula and assumptions are used?

Yield, self-consumption, prices and installed cost are user inputs. Assumes generated energy up to annual use offsets purchases; excludes export credits, seasonality, degradation, finance, incentives and maintenance. Not an installation design or savings guarantee.

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