Solar Panel Calculator for Singapore
Rooftop solar suits Singapore's landed homes and businesses with strong year-round sun. This free solar calculator estimates your system size, payback and savings in Singapore dollars using local rates and sun hours.
Calculate my solar payback in Singapore →
Solar at a glance in Singapore
Roof space is the main constraint on landed properties; each kilowatt produces well given consistent irradiance.
| Currency | Singapore dollars (SGD) |
|---|---|
| Typical electricity rate | S$ 0 per kWh |
| Installed cost | ≈ S$ 4 per watt |
| Peak sun hours | ≈ 4.2 hours/day |
| Export / buyback | ≈ S$ 0 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 4 kW system in Singapore
At around S$ 4 per watt, a 4 kW rooftop system costs roughly S$ 14,000 and produces about 4,783 kWh in its first year at Singapore's 4.2 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. Singapore and Singapore dollars 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 Singapore
How many solar panels do I need in Singapore?
It depends on your electricity use, roof space and local sun hours (about 4.2 peak sun hours/day here). A 4 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 Singapore have net metering?
Smaller systems can offset consumption and be paid for export under the utility's rules (e.g. the Simplified Credit Treatment), which the calculator models as a buyback rate.
Are there solar subsidies or incentives in Singapore?
There is no broad residential cash subsidy; strong sun and high self-consumption drive the returns.
How much does a solar system cost in Singapore?
A typical 4 kW system is around S$ 14,000 at about S$ 4 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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