ruchira
// FINANCE TOOL

Solar ROI and payback calculator (Sri Lanka and worldwide)

See the payback, return and savings of rooftop solar. Uses Sri Lanka's 2026 CEB tariff and Net Plus rates, or your own tariff anywhere in the world.

  • Free
  • No sign-up
  • Private: runs in your browser
// HOW IT WORKS

4 steps, no sign-up.

Built and maintained by Ruchira Sachinthana. Spotted a bug or want a feature? Tell me.

  1. 01Choose Sri Lanka or another country, and enter your monthly electricity use.
  2. 02Set the system size, cost per kW and your area's sun yield.
  3. 03In Sri Lanka, pick Net Plus, Net Accounting or Net Metering. Elsewhere, set your self-use share and export rate.
  4. 04Read the payback, the gain over the years you choose and the IRR, then adjust the assumptions.
// FAQ

Solar ROI calculator: questions, answered.

Something else? Ask on WhatsApp.

The PUCSL domestic tariff effective 11 May 2026, and the Net Plus rates from 25 August 2026: Rs 23.11 per kWh up to 10 kW, Rs 19.15 to 40 kW, Rs 17.11 to 250 kW and Rs 15.81 above. Check current rates with CEB or LECO before you sign.

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// CUSTOM TOOLS

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