15,000 baht bill
15,000 baht bill
is solar + battery worth it?
A home with a 15,000 baht monthly bill (about 3,061 units) suits 10–15 kW of solar. The starting package, Huawei 10 kW, costs ฿259,000 including installation and the permit, saves about ฿6,000–7,000 a month and pays back in about 3.1–3.6 years. A battery slows payback; it is worth it when you want backup power during outages or use a lot of power at night.
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 · a starting size for a bill of about ฿15,000
Starting set chosen for you: Huawei 15 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
Solar only
Packages that suit a 15,000 baht bill
| Package | Home power | Price incl. VAT | Monthly saving (est.) | Payback (est.) |
|---|---|---|---|---|
| Huawei 10 kW | 1-phase | ฿259,000 | ฿6,000–7,000 | 3.1–3.6 years |
| Huawei 10 kW | 3-phase | ฿279,000 | ฿6,000–7,000 | 3.3–3.9 years |
| Huawei 12 kW | 3-phase | ฿309,000 | ฿6,100–8,200 | 3.1–4.2 years |
| Huawei 15 kW | 3-phase | ฿369,000 | ฿7,600–10,300 | 3–4 years |
| Sigenergy NEO 12 kW | 1-phase | ฿299,000 | ฿6,100–8,200 | 3–4.1 years |
| Sigenergy NEO 10 kW | 3-phase | ฿279,000 | ฿6,000–7,000 | 3.3–3.9 years |
| Sigenergy NEO 15 kW | 3-phase | ฿349,000 | ฿7,600–10,300 | 2.8–3.8 years |
| Sigenergy 10 kW | 1-phase | ฿299,000 | ฿6,000–7,000 | 3.6–4.2 years |
| Sigenergy 10 kW | 3-phase | ฿309,000 | ฿6,000–7,000 | 3.7–4.3 years |
A suitable package = panels that produce close to what the home uses in the daytime (40–70% of the month), so 70–95% of the solar power is used at home · Estimates assume panels produce 115 units per kWp a month, power costs 4.9 baht per unit (incl. VAT), the home uses 40–80% of its solar power and sells the rest to the utility at 2.2 baht per unit (up to 5 kW per meter under the utility programme). Real figures depend on your home's use; see yours in the designer.
Add battery
What a battery does, and how it pays back
A battery does not make payback faster. What you get is backup power during outages and solar power in the evening.
| Battery | Price incl. VAT | Extra saving per month (est.) | Payback from the bill (est.) | Backup for essentials |
|---|---|---|---|---|
| Tesla Powerwall ×1 13.5 kWh | ฿389,000 | ฿500–1,800 | 18–64.8 years | 24 h |
| Tesla Powerwall ×2 27 kWh | ฿709,000 | ฿1,000–3,600 | 16.4–59.1 years | 49 h |
| Huawei LUNA 6.9 kWh | ฿142,000 | ฿300–900 | 13.1–39.4 years | 12 h |
| Huawei LUNA 13.8 kWh | ฿242,000 | ฿500–1,800 | 11.2–40.3 years | 25 h |
| Sigenergy 9 kWh | ฿145,000 | ฿300–1,200 | 10.1–40.3 years | 16 h |
| Sigenergy 18 kWh | ฿275,000 | ฿700–2,400 | 9.5–32.7 years | 32 h |
| Sigenergy NEO 8 kWh | ฿99,000 | ฿300–1,100 | 7.5–27.5 years | 14 h |
| Sigenergy NEO 16 kWh | ฿189,000 | ฿600–2,100 | 7.5–26.3 years | 29 h |
A battery saves extra by moving daytime solar power to the evening: low = half a cycle a day instead of exporting (4.9 − 2.2 baht per unit) · high = a full cycle every day at the full 4.9 baht per unit (homes that cannot export) · efficiency 90% · backup = capacity × 0.9 ÷ essentials of 0.5 kW (fridge, lights, internet, fans)
FAQ
Questions about a 15,000 baht bill
What size solar for a 15,000 baht bill?
A home with a 15,000 baht monthly bill (about 3,061 units) suits 10–15 kW of solar. The starting package, Huawei 10 kW, costs ฿259,000 including installation and the permit, saves about ฿6,000–7,000 a month and pays back in about 3.1–3.6 years. A battery slows payback; it is worth it when you want backup power during outages or use a lot of power at night.
Is solar worth it for a 15,000 baht bill?
Worth it when the home uses a lot of power in the daytime. The Huawei 10 kW package saves about ฿6,000–7,000 a month and pays back in about 3.1–3.6 years; panels carry a 30-year warranty.
Is a battery worth it for a 15,000 baht bill?
On the bill alone, a battery pays back far more slowly than solar (about 7.5 years or more). What a battery gives you is power during outages and solar power at night. It suits homes with frequent outages, people working from home, or equipment that must not lose power.
Solar with or without a battery?
If the goal is fast payback, start with solar only and add a battery later. If the goal is never losing power, install the battery from the start. Every Sigenergy package is battery-ready, and Tesla Powerwall works with any solar brand.
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The designer simulates a day in your home and compares with and without a battery at once.
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