Solar Panel Calculator for Sri Lanka
With high electricity tariffs and strong sun, rooftop solar is a compelling choice in Sri Lanka. This free solar calculator estimates your system size, payback and savings in rupees using local rates and sun hours.
Calculate my solar payback in Sri Lanka →
Solar at a glance in Sri Lanka
Good sun and high retail rates keep payback attractive for grid-tied homes.
| Currency | Sri Lankan rupees (LKR) |
|---|---|
| Typical electricity rate | Rs 45 per kWh |
| Installed cost | ≈ Rs 600 per watt |
| Peak sun hours | ≈ 5.2 hours/day |
| Export / buyback | ≈ Rs 16 per kWh |
Indicative 2026 starting points — every figure is editable in the calculator, and results depend on your own bill, roof and installer quotes.
A typical 5 kW system in Sri Lanka
At around Rs 600 per watt, a 5 kW rooftop system costs roughly Rs 3,000,000 and produces about 7,402 kWh in its first year at Sri Lanka's 5.2 peak sun hours a day. Your real numbers depend on your roof, shading, panel choice and how much power you use during the day — run your own figures in the calculator to see your exact payback, net savings and ROI.
How the solar calculator works
- Your setup. Sri Lanka and Sri Lankan rupees are pre-selected, with local electricity rate, install cost and sun hours filled in. Enter your monthly bill, or size the system from your appliances.
- Your roof. Search your address or tap “use my location”, then draw your roof on the satellite map — or just type its area. We check the system fits and read local sun hours from NASA data.
- Your results. Instantly see your payback period, net savings, ROI, system size, year-1 production and lifetime CO₂ offset — compare cash vs. a loan, and download a PDF report.
Common questions — solar in Sri Lanka
How many solar panels do I need in Sri Lanka?
It depends on your electricity use, roof space and local sun hours (about 5.2 peak sun hours/day here). A 5 kW system of high-wattage panels is a common starting point for a home — enter your bill or appliances and the calculator gives your exact panel count and system size.
Does Sri Lanka have net metering?
Sri Lanka offers net metering, net accounting and net plus schemes through CEB and LECO — from banking credits to being paid for export. The calculator models your export rate as buyback.
Are there solar subsidies or incentives in Sri Lanka?
There is no broad national cash subsidy at present; the value comes from high avoided tariffs plus the export schemes.
How much does a solar system cost in Sri Lanka?
A typical 5 kW system is around Rs 3,000,000 at about Rs 600 per watt installed. The calculator prices your exact size.
Work out your system size
Not sure how big a system you need? These guides work back from your monthly usage:
500 kWh/month 1,000 kWh/month 1,500 kWh/month 2,000 kWh/month 2,500 kWh/month 3,000 kWh/month
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