Solar Panel ROI Calculator

Find how quickly a rooftop solar system pays for itself and its net savings over a 25-year life.

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What is the Solar Panel ROI Calculator?

A solar ROI calculator weighs the system cost against the yearly bill savings to give a payback period and lifetime return.

How to Calculate

Annual saving = size × sun hours × 365 × tariff. Payback = system cost ÷ annual saving. Net 25-year saving subtracts the cost.

Formula

Payback = System cost ÷ Annual saving

How to Use

  1. Enter your details in the fields above.
  2. The result updates instantly as you type.
  3. Use Copy, Print or Download PDF to save your result.

Frequently Asked Questions

Do subsidies change this?
Yes u2014 enter the cost after any government subsidy. A lower net cost shortens the payback period significantly.
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