Solar ATAP Malaysia CNY Guide: How Many Rooms Can a 5kW System Really Cool on Day One of Chinese New Year (and What About 8kW)?

Solar ATAP Malaysia CNY Guide: How Many Rooms Can a 5kW System Really Cool on Day One of Chinese New Year (and What About 8kW)?

This article walks through a simple, physics‑based way to visualise what 5kW and 8kW systems can do for your air‑cond and basic loads during CNY visiting hours, using Malaysian generation benchmarks and typical air‑cond ratings.

1. How Much Energy Can 5kW and 8kW Solar Actually Produce in Midday Hours?

In Malaysia, a common rule of thumb is that 1 kWp of solar PV generates about 4–5 kWh per day under average conditions, with around 4–5 peak sun hours depending on location. [web:206][web:230] For the 11am–4pm window on a good CNY weather day, it is reasonable to approximate about 4–4.5 full‑power hours, especially in KL/Selangor/JB/Melaka where sun is strong but clouds can appear. [web:198][web:202][web:229]

These are estimates, not guarantees, but they are good enough to answer the question: “5kW vs 8kW—what kind of CNY cooling can I expect?”

2. Translating kWh into Rooms: 1.0 HP vs 1.5 HP Air‑Cond

Residential split‑unit air‑conds in Malaysia are often 1.0 HP to 1.5 HP for bedrooms and small living rooms. A rough electrical draw is:

• 1.0 HP inverter: about 0.75–0.9 kW while running.
• 1.5 HP inverter: about 1.2–1.4 kW while running.

For a 5‑hour window (11am–4pm):

• 1.0 HP: ≈ 0.85 kW × 5 h ≈ 4.25 kWh.
• 1.5 HP: ≈ 1.3 kW × 5 h ≈ 6.5 kWh.

Remember that Solar ATAP is self‑consumption first: your home uses solar directly for these loads, and only genuine surplus flows out as export credits. [web:33][web:147]

3. Why ATAP’s No-Rollover Credits Mean “Use It or Lose It” on CNY

Under Solar ATAP, export credits for domestic users offset the energy charge only and expire at the end of each billing cycle, with no rollover to future months—unlike NEM 3.0, which allowed 24‑month credit carry‑forward. [web:33][web:147]

• On a busy CNY day, self‑consumption is naturally high, which is ideal.
• On normal days, an oversized system may export much more than your monthly energy charge, creating credits you cannot use before they reset. [web:33]

This is why “precision sizing” for your family’s room count and AC habits matters more than “just fill the whole roof”. [web:33][web:147]

4. Interactive: 5kW vs 8kW – How Many Rooms Can You Cool?

Note: This is an illustration using typical Malaysian generation (4–4.5 sun hours) and common AC efficiency assumptions. HOMI refines these numbers using your exact models, roof, and TNB data. [web:206][web:230][web:33]

5. How HOMI Designs Around Rooms, Models and Real TNB Bills

HOMI does not guess your kW size from roof photos alone; we start from how many rooms you actually want to cool and how your TNB usage behaves across the year. [web:33][web:206]

Step 1: Map Your Cooling Zones

• Number of bedrooms with AC, living room size, family hall, and study/WFH rooms.
• AC horsepower (1.0 HP vs 1.5 HP) and whether they are inverter or non‑inverter units.

Step 2: Overlay February/CNY Load on Solar Output

• We use Malaysia’s 4–5 peak sun hours and local climate data (31–33°C daytime in February) to model solar generation. [web:198][web:202][web:229][web:230]
• We simulate 11am–4pm and 11am–6pm usage curves on CNY and normal weekends.

Step 3: Choose a Size that Maximises Self-Consumption Under ATAP

• We model 5kW, 6kW, 8kW (and others) against your TNB history to see how often credits hit the cap of your monthly energy charge. [web:33][web:147]
• We recommend a kW range where most generation either directly cools your home or offsets charges you would actually pay within that month.

That is how we turn the question “5kW enough or do I need 8kW?” into a clear coverage percentage per room, backed by real numbers instead of guesswork.