Find the system size that fits your roof and your usage
Every roof and every bill is different. Tell us your usable roof area, your typical electricity bill, and what matters most to you — we'll estimate a system size, its payback period, and (if you need it) a backup battery size.
Estimate your system
Adjust the numbers to match your situation — the estimate updates instantly.
Roughly the flat, unshaded, structurally sound area — not your whole roof. (1 ตารางวา ≈ 4 ตร.ม.)
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Recommended system size (kWp)
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Est. annual savings
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Est. payback period (years)
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Est. 25-year savings
Your usable roof area is the limiting factor here — if more roof area becomes available later, a larger system could save even more.
Your electricity usage is the limiting factor here — your roof could fit a larger system, but sizing it to your current usage avoids paying for capacity you can't use.
Backup power estimate
A rough starting point for critical circuits only (lighting, key equipment, security) during an outage of a few hours:
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This is a rough starting point, not a design — exact battery sizing depends on which loads you want to keep running and for how long. We'll confirm this during your free site assessment.
How we calculate this estimate
Roof area → system size: about 6–9 m² of usable roof per kWp of panels, including spacing and access (we use 7 m²/kWp).
Electricity bill → usage: converted to kWh using Thailand's average tariff of ~4.2 ฿/kWh (incl. Ft & VAT, per PEA/MEA published tariffs).
Energy yield: ~1,400 kWh per kWp per year, typical for solar irradiance in Eastern Thailand (Chonburi / EEC).
We size the system to whichever is smaller — what your roof can fit, or about 70% of your annual usage (a typical daytime self-consumption share) — so you're not paying for capacity you can't use.
System cost and payback use the indicative package pricing from our Packages & Pricing page, interpolated for your system size.
25-year savings assume electricity prices rise by about 3% a year.
This is a planning estimate, not a quotation. Actual system size, cost and savings depend on your roof's structure, shading and orientation, and a full review of your usage — all confirmed for free during a site assessment.
Engineered PV Systems
Grid-Tie Solar Power for Your Facility
We design and install rooftop solar PV systems that offset your facility's electricity costs — from initial site survey through licensed-engineer-certified design to installation, testing and utility grid-connection support.
Roof & site assessment matched to your building structure
String, cable and protection sizing calculated to design standards
Installation, commissioning and PEA on-grid connection support
What's Included
Complete PV System Components
Every installation is specified end-to-end — no gaps between panel and grid connection.
Monocrystalline PV ModulesGrid-Tie String InverterMounting & Racking StructureDC/AC Circuit Breakers & SPDMC4 DC Connectors & CablingGrounding & BondingSmart Energy Monitoring
Our Process
From Site Survey to Grid Connection
A structured, engineer-led process for every project.
Step 1
Site Survey
Assess roof structure, orientation and available area to size the system correctly.
Step 2
Engineering & Calculation
String sizing, cable & voltage-drop calculation, and energy yield estimate.
Step 3
Install & Commission
Panels, inverter, mounting, cabling and protection installed and tested on site.
Step 4
Certify & Connect
Licensed engineer-stamped drawings and support through PEA grid-connection approval.
Standards & Compliance
Engineered to Code
Every design is calculated and stamped to recognized electrical and grid-interconnection standards.
Most rooftop systems are installed within a few days on site, depending on system size and roof complexity. The full process from site assessment to grid connection — including engineering, permitting, and utility interconnection — takes longer, since it depends on PEA/MEA processing times.
What happens on cloudy days?
Your system still produces power on cloudy days, just at a reduced rate. Under Thailand's net-metering arrangements, annual production is what matters most to your bill — not any single day's weather.
Do we need a battery to go solar?
No — most grid-tied systems don't require one. A battery adds backup power during outages and more control over self-consumption, but it's an optional add-on, not a requirement to start saving.
Is our roof or facility suitable for solar?
Most roof types can support solar, but orientation, shading, structural condition, and available area all affect system size and output. That's exactly what the free site assessment is for — a real answer, not a guess from a form.
How do we get an exact price, not just an estimate?
The calculator above gives you a starting estimate. Contact our team and we'll provide a written system design and quote based on your actual roof and usage.
Ready to put your rooftop to work?
Send us your building details and target system size — we'll handle survey, design and installation.
