Solar 20 kW
20 kW solar
price and payback
Solar D's 20 kW packages cost ฿469,000–489,000, including 40 panels, the inverter, installation, the utility permit and VAT (prices as of 15 Nov 2026). They produce about 2,944 units a month, save about ฿5,800–11,500 a month and pay back in about 3.4–7.1 years. Suited to homes with a monthly bill of about 21,000–36,000 baht.
Survey booking fee ฿1,500 — deducted from the full price · fully refunded if the house cannot be installed
Book the survey now — no chat needed
Our team checks the roof and the switchboard and confirms the size and the real price before you decide
Starting set chosen for you: Huawei 20 kW 3-phase · switch 1/3-phase on the booking page · the team right-sizes it at the survey · open days within 3 working days
Price
Every 20 kW package
| Package | Home power | Price incl. VAT | Monthly saving (est.) | Payback (est.) |
|---|---|---|---|---|
| Huawei 20 kW | 3-phase | ฿469,000 | ฿5,800–11,500 | 3.4–6.8 years |
| Sigenergy 20 kW | 3-phase | ฿489,000 | ฿5,800–11,500 | 3.5–7.1 years |
Estimate with the panels producing 115 units per kWp (panel power) per month, electricity at 4.9 baht per unit (incl. VAT), 40–80% of the sun used at home and the rest sold back at 2.2 baht per unit (up to 5 kW per meter under the utility programme). Your real figures depend on how your house uses electricity; see them in the system designer
What is included
The price includes everything you need
Main equipment: panels, inverter, mounting
Installed by the Solar D team in 1–2 days
Electrical drawings and the MEA or PEA permit
Warranty: workmanship 2 years, panels 30 years, inverter 10 years
Solar D Care for the first year
VAT 7%
FAQ
Questions about 20 kW solar
How much does a 20 kW solar system cost?
Solar D's 20 kW packages cost ฿469,000–489,000, including 40 panels, the inverter, installation, the utility permit and VAT (prices as of 15 Nov 2026). They produce about 2,944 units a month, save about ฿5,800–11,500 a month and pay back in about 3.4–7.1 years. Suited to homes with a monthly bill of about 21,000–36,000 baht.
How many years does 20 kW solar take to pay back?
About 3.4–7.1 years. Homes that use more of their own solar power (someone home in the day, air-con, EV charging) pay back faster; surplus sells to the utility at 2.2 baht per unit.
How many units a day does 20 kW solar produce?
About 98 units a day, or 2,944 units a month in normal sun (25.6 kWp of panels at 115 units per kWp a month).
Which electricity bill suits 20 kW solar?
Homes with a bill of about 21,000–36,000 baht a month that use about 40–70% of their power in the daytime.
Can a 1-phase home install 20 kW?
ชุด 20 kW ที่ขายตอนนี้ใช้กับบ้านไฟ 3 เฟส บ้าน 1 เฟสดูชุดขนาดอื่นในหน้าราคา
Your home's own numbers
Enter your monthly bill and the designer shows the right size, price and payback for your home at once.
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