☀️ Free Online Calculator

Solar Panel Calculator: Estimate Power, Cost & ROI Period

Planning to install a photovoltaic system? Our free solar calculator provides an accurate estimate of the required system size, upfront investment cost, and a 20-year financial payback simulation.

Take the first step towards energy independence, cut your monthly electricity bills, and see how heat pumps, electric vehicles, and battery storage impact your payback period.

1. Enter Your Details

Increases self-consumption and stores surplus energy.

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Enter Your Data on the Left

The calculator will estimate recommended system size, total investment cost, yearly savings, and payback period.

SYSTEM SIZE 0 kWp
ESTIMATED COST 0 € *after subsidies
PAYBACK PERIOD 0 years
Estimated Annual Production: 0 kWh
First Year Savings: 0 € / year

20-Year Cumulative Financial Flow

Detailed Year-by-Year Simulation

Want an Accurate Quote for Your Roof?

Get up to 3 non-binding quotes from vetted local solar installers.

How Does the Solar Panel Calculator Work?

This solar system calculator performs an instant financial and energy simulation for residential and commercial solar micro-powerplants. Based on your current monthly electricity bill or yearly energy consumption in kilowatt-hours (kWh), the algorithm determines the optimal peak capacity in kilowatt-peak (kWp).

  • Regional Solar Yield: Geographic location dictates annual sunshine hours and yield per installed peak kW.
  • Roof Orientation: South facing installations yield maximum output, while East/West setups average around 90% efficiency.
  • Future Power Loads: Adding heat pumps or EVs increases capacity requirements to keep your household self-sufficient.
  • Battery Storage Options: Storing solar energy allows nighttime self-consumption, protecting you from peak grid rates.

Frequently Asked Questions (FAQ)

Modern high-efficiency photovoltaic panels require roughly 5 to 6 m² of usable, unshaded roof space per 1 kWp. A standard 10 kWp array needs about 50–60 m².

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