本帖最后由 aidj 于 6-4-2026 10:11 AM 编辑
Atap卖回给tnb吃亏滴
**For a terrace house in Johor Bahru with a ~RM50 monthly TNB bill, solar is generally **not worth installing right now** under the 2026 Solar ATAP rules.** The payback period would stretch to 10–15+ years (or longer), and the small savings don’t justify the upfront cost for most people.
### Why your low bill changes everything
- **Your usage**: RM50 typically equals **~180–220 kWh/month** (very low — first tariff tier only, efficient single-person or minimalist household). You’re already in the cheapest bracket (around 21.80–33.40 sen/kWh + small add-ons like ICPT/AFA).
- **Recommended system size**: You’d only need a tiny **1–2 kWp** setup to cover most of your daytime needs (fridge, lights, fan, occasional AC). Anything bigger would mostly export power.
- **Current costs (2026)**: Even a small 1 kWp system runs **RM3,500–4,500** turnkey (panels + inverter + install + meter). A 3 kWp (more common minimum for installers) jumps to **RM12,000–15,000**. Terrace roofs are usually fine for this size, but shading from neighbours or trees matters.
### Expected savings & payback (Solar ATAP)
- **Self-consumption savings**: You avoid paying your full TNB rate on solar power used during the day → roughly **RM40–55/month** if perfectly sized.
- **Export credits**: Excess goes to TNB at the **Energy Charge only** (~27–37 sen/kWh). Credits reset monthly (no rollover like old NEM), so you lose anything unused.
- **Annual savings**: ~RM500–700 max.
- **Payback**: 8–12 years for a well-sized 1–2 kWp system; 12–18+ years for bigger ones. After that, ~15–20 years of near-free power — but that’s a long wait for RM50/month relief.
- Johor Bahru gets solid sun (~4.0–5.0 kWh/kWp/day average), so production is decent, but your low usage means most value comes from self-consumption only.
### Terrace-specific realities
- **Roof space**: Double-storey terraces usually have enough unshaded south/east-facing roof for 1–3 kWp (no issue there).
- **Other costs**: Minimal maintenance (~RM200–400/year), but you still pay the fixed parts of your TNB bill (retail charge waived under 600 kWh anyway).
- **Future-proofing**: Tariffs are rising slowly + AFA fluctuations. If your bill stays RM50 forever, solar is overkill. But if you add AC, EV charger, kids, or work-from-home, usage could double quickly.
### Honest recommendation
**Skip it for now** unless:
- You plan to stay 15+ years **and** expect your bill to rise (e.g., more appliances/family).
- You get a **very cheap quote** for a micro 1–1.5 kWp system (some installers do these as “add-on” packages).
- You want it for environmental reasons or property value boost (minor, but real).
Most installers and calculators recommend solar only for **RM150–200+ bills** on terraces for a sensible 6–10 year payback. At RM50, you’re better off:
1. Double-checking energy efficiency (LEDs, 5-star appliances, no phantom loads).
2. Monitoring your next 3 bills for patterns (myTNB app shows daytime vs night use).
3. Getting **2–3 free quotes** anyway (mention “small 1–2 kWp for low-usage terrace”) — prices have dropped, and someone might surprise you.
If your bill is creeping up or you share your exact average kWh (from the bill) + roof photos/details, I can run a more precise payback estimate. Otherwise, save the cash or wait for even cheaper panels/batteries in 2027+. ☀️
Want me to suggest quick no-cost ways to drop that RM50 even lower? Just say the word! |
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发表于 4-4-2026 06:35 PM
变色卡
千斤顶
楼主
。。。前提是你知道自己在搞什么
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