Solar Panel Calculator for Thailand
Thailand's strong sun and rising tariffs make rooftop solar worthwhile, especially for daytime-heavy homes and businesses. This free solar calculator estimates your system size, payback and savings in baht using local rates and sun hours.
Calculate my solar payback in Thailand →
Solar at a glance in Thailand
Sizing to match daytime load gives the best payback given the lower export rate.
| Currency | Thai baht (THB) |
|---|---|
| Typical electricity rate | ฿ 5 per kWh |
| Installed cost | ≈ ฿ 90 per watt |
| Peak sun hours | ≈ 5 hours/day |
| Export / buyback | ≈ ฿ 2 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 Thailand
At around ฿ 90 per watt, a 5 kW rooftop system costs roughly ฿ 450,000 and produces about 7,118 kWh in its first year at Thailand's 5 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. Thailand and Thai baht 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 Thailand
How many solar panels do I need in Thailand?
It depends on your electricity use, roof space and local sun hours (about 5 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 Thailand have net metering?
Thailand uses a net-billing style scheme where surplus is bought back at a set rate (typically below retail) rather than one-to-one net metering — so self-consumption matters most. The calculator models the buyback rate.
Are there solar subsidies or incentives in Thailand?
There is no broad residential cash subsidy; returns come from offsetting the retail tariff plus modest export payments.
How much does a solar system cost in Thailand?
A typical 5 kW system is around ฿ 450,000 at about ฿ 90 per watt installed. The calculator prices your own 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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