Solar Cost Guide 2025
Solar installation prices 2025Every size: homes, factories, businesses
2025 solar installation prices for every size from 3 kW to 500 kW, for homes, factories and businesses, with price tables, payback periods and real ROI, by EV Power Energy
Solar price table for every size, 2025
Approximate prices including equipment and installation, excluding VAT (updated August 2025)
| System size | Best for | Price (baht) | Savings/month | Payback |
|---|---|---|---|---|
| 3 kW | Small home, bill 1,000–2,000 baht/month | 90,000–130,000 | 1,500–2,000 baht | 5–7 years |
| 5 kW | Typical home, bill 2,000–4,000 baht/month | 150,000–210,000 | 2,000–3,500 baht | 4–6 years |
| 8 kW | Large home / small office, bill 3,000–6,000 baht/month | 230,000–320,000 | 3,000–5,000 baht | 4–5 years |
| 10 kW | Large home / small business | 280,000–380,000 | 3,500–6,000 baht | 4–5 years |
| 20 kW | SMEs, shops, warehouses, offices | 550,000–750,000 | 6,000–10,000 baht | 4–5 years |
| 50 kW | Small factories, commercial buildings | 1,300,000–1,800,000 | 15,000–25,000 baht | 4–5 years |
| 100 kW | Mid-size factories, shopping malls | 2,500,000–3,500,000 | 30,000–50,000 baht | 3–5 years |
| 500 kW+ | Large factories, industrial estates | Contact us | Contact us baht | 3–4 years |
* Prices may change with equipment costs, roof condition and distance. Get a real quotation for free
How long does solar take to pay back? Real examples
Typical home — 5 kW system
Investment
180,000 baht
- Electricity savings
- 2,500 baht/month
- Payback
- 6 years
- Total 25-year savings
- 750,000 baht
Invest 180K ✦ get back 750K over 25 years
SME office — 30 kW system
Investment
820,000 baht
- Electricity savings
- 15,000 baht/month
- Payback
- 4.5 years
- Total 25-year savings
- 4,500,000 baht
IRR ~22% per year
Factory — 200 kW system
Investment
5,200,000 baht
- Electricity savings
- 90,000 baht/month
- Payback
- 4.8 years
- Total 25-year savings
- 27,000,000 baht
Save 1 million+ a year for 25 years
Solar installation, start to finish
Site survey and assessment (free)
Our team surveys your roof, checks the existing wiring and analyzes your electricity bill to design the best system, free of charge
⏱ 1 day
Get the design and quotation
Receive a detailed system design specifying size, equipment brands, price and projected ROI
⏱ 1–3 days
Electricity authority permit
Our team prepares the paperwork and files the MEA/PEA application for you — no trip to the electricity authority
⏱ 2–4 weeks
Solar system installation
Professional technicians install the panels, mounting, inverter and wiring to safety standards
⏱ 1–3 days
Testing, handover and warranty
System testing, monitoring app walkthrough, and warranty documents: 30 years on panels, 10 years on the inverter
⏱ 1 day
FAQ — solar prices
How much does a 5 kW solar system cost in 2025?+
A 5 kW home solar system in 2025 costs about 150,000–210,000 baht, including panels, inverter, mounting, wiring and installation labor. Price depends on panel brand, inverter quality and roof complexity
How long does home solar take to pay back?+
Homes with high daytime use (air conditioning, working from home) pay back within 4–6 years; homes that mostly use power at night pay back in 7–10 years. Panels last 25–30 years, so everything after payback is pure savings
What is the cheapest solar system?+
The most affordable home system starts at 3 kW for about 90,000–130,000 baht. Beware of unusually low prices (under 70,000 baht for 3 kW) — they often mean low-quality panels, short warranties or substandard installation
What size factory solar system suits my electricity bill?+
A factory with a 100,000 baht/month bill suits a 30–50 kW system; 500,000 baht/month suits 150–200 kW; and 1,000,000+ baht/month suits 300 kW and up. The exact size must be calculated from your actual bills and load profile
What does the solar price include?+
Quoted prices include: solar panels, inverter, mounting (rail + brackets), DC/AC cabling, DB box and protection devices, installation labor, initial electricity authority permit and system testing. Additional electrical work is not included (if the existing wiring isn't suitable)
How much can solar cut my monthly bill?+
A 5 kW system produces an average of 18–22 units/day, or 540–660 units/month — worth 2,000–3,500 baht/month (at 3.5–5.0 baht/unit). Actual figures depend on local sunshine and roof orientation
Can I get a tax deduction for solar?+
Individuals can deduct up to 200,000 baht under Royal Decree No. 805 (2026); companies can expense 1.5 times the cost and may also qualify for BOI incentives (check the conditions before filing).
Get a free solar quotation
Site survey, design and a real quotation, free of charge