3,000 baht bill
3,000 baht bill
is solar + battery worth it?
A home with a 3,000 baht monthly bill (about 612 units) uses less power than the smallest 5 kW package produces. The Huawei 5 kW package costs ฿169,000 including installation and the permit; power the home cannot use sells to the utility at 2.2 baht per unit. It saves about ฿2,300–2,800 a month and pays back in about 5–6.1 years, slower than homes with higher bills. If you plan to add air-con or an EV, the system becomes better value. A battery slows payback further.
Solar only
Packages that suit a 3,000 baht bill
| Package | Home power | Price incl. VAT | Monthly saving (est.) | Payback (est.) |
|---|---|---|---|---|
| Huawei 5 kW | 1-phase | ฿169,000 | ฿2,300–2,800 | 5–6.1 years |
| Huawei 5 kW | 3-phase | ฿189,000 | ฿2,300–2,800 | 5.6–6.8 years |
| Sigenergy NEO 5 kW | 3-phase | ฿199,000 | ฿2,300–2,800 | 5.9–7.2 years |
| Sigenergy 5 kW | 3-phase | ฿229,000 | ฿2,300–2,800 | 6.8–8.3 years |
The home uses 40–70% of its 612 units a month in the daytime; what the panels produce beyond that sells at 2.2 baht per unit · 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 3,000 baht bill
What size solar for a 3,000 baht bill?
A home with a 3,000 baht monthly bill (about 612 units) uses less power than the smallest 5 kW package produces. The Huawei 5 kW package costs ฿169,000 including installation and the permit; power the home cannot use sells to the utility at 2.2 baht per unit. It saves about ฿2,300–2,800 a month and pays back in about 5–6.1 years, slower than homes with higher bills. If you plan to add air-con or an EV, the system becomes better value. A battery slows payback further.
Is solar worth it for a 3,000 baht bill?
Less worth it than for homes with higher bills, because surplus sells for only 2.2 baht per unit. The Huawei 5 kW package pays back in about 5–6.1 years; panels carry a 30-year warranty. Better value if the home plans to use more power in the daytime.
Is a battery worth it for a 3,000 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.
Enter your home's real bill
The designer simulates a day in your home and compares with and without a battery at once.
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