Malaysia's Unique Solar Position
Every solar guide you read from Australia, the UK, or the US will tell you: always face south. In Malaysia, that advice is only partially correct — and misunderstanding why can cost you thousands in system design mistakes.
Malaysia sits between 1° and 7° North latitude — almost on the equator. This single geographic fact changes everything about how you should think about solar panel direction.
- Near Equator: 1-7°N Latitude
- Sun is nearly overhead year-round
- Direction difference: only 5-15%
- Almost any roof orientation is viable
- Direction difference: up to 50-60%
- North-facing roof = almost useless
- Must face south (or north in Southern Hemisphere)
Key Insight
In Malaysia, a north-facing roof still produces 85-88% of what a south-facing roof produces. In Germany, a north-facing roof would produce less than 50%. This means virtually every Malaysian home has a viable roof for solar — the question is optimization, not viability.
Why the sun path matters
In Kuala Lumpur (3.1°N), the sun rises roughly east and sets roughly west — but its arc passes nearly overhead (zenith angle less than 30° for most of the year). Twice a year (around March 21 and September 23), the sun passes directly overhead. This overhead path means all roof faces receive significant direct sunlight, unlike temperate latitudes where the sun always stays to the south.
Solar Output by Roof Direction
Based on Malaysian solar irradiance data (about 3.5 peak sun hours/day, the basis Trexon uses for sizing and savings), here is what you can actually expect from each roof orientation.
% of optimal annual output
Note: Figures assume a 5.58 kWp system, 30° tilt, no shading, average Malaysian irradiance (Klang Valley baseline). Northern Malaysia (Penang, Kedah) may see slightly higher yields; Sabah/Sarawak varies by microclimate.
Why South Still Leads (Slightly)
Even though Malaysia is near the equator, the sun still spends slightly more time south of the zenith due to the Earth's axial tilt. South-facing panels consistently receive marginally more direct irradiance across all seasons, giving them a slight edge; modelled output is about 93% for east-facing and 91% for west-facing roofs relative to south.
East-West Split: The Smart Configuration Under Solar ATAP
Here is something most solar sales people will not tell you: for many Malaysian homeowners under the Solar ATAP scheme, a 50/50 east-west split can improve self-consumption for some households — even though it produces less total energy. The table below does not count that gain.
Why Self-Consumption Beats Total Production
- 1Solar ATAP export rate pays you the TNB Energy Charge (RM 0.2703/kWh) for exported energy. But your grid tariff is RM 0.44-0.57/kWh. Every unit you self-consume saves more than every unit you export.
- 2An all-south configuration produces a sharp peak around noon — the exact time most households are empty. This excess mid-day energy gets exported at the lower rate.
- 3An east-west split produces a flatter generation curve: east panels power your morning routine (kettle, water heater, washing machine), west panels cover your late afternoon and evening (cooking, TV, air conditioning). More energy gets self-consumed at the higher tariff rate.
Generation Curve Comparison
East-West Advantage
East-west split systems typically achieve higher self-consumption than equivalent all-south systems which can partly offset the roughly 8% lower total energy. How much depends on your household's daily usage pattern, so the savings table below does not count any gain.
When All-South is Still Better
- You have battery storage (self-consumption is already maximized)
- Your household is home all day (self-consumption matches noon peak naturally)
- Grid-connected commercial with consistent daytime load
Multi-Direction Roofs: Getting the Inverter Right
If your roof has panels facing different directions, the inverter choice becomes critical. Panels facing different orientations will peak at different times — and if they share a single MPPT input, the weaker direction will drag down the stronger one.
Option 1: Dual-MPPT String Inverter
The most cost-effective solution for east-west splits. A string inverter with 2 independent MPPT inputs (like Sungrow SG8K-D, Huawei SUN2000-8KTL, or GoodWe GW8K-DT; GoodWe and micro inverters are market references, not stocked by Trexon) allows each roof section to be optimized independently. East panels connect to MPPT1, west panels to MPPT2.
Pros
Cons
Option 2: Micro Inverters
Each panel has its own inverter, operating completely independently. Perfect for complex roofs with 3+ orientations, shading issues, or roofs where string lengths cannot be matched. Panel-level monitoring shows exact output per panel.
Pros
Cons
What to Avoid
Never connect east-facing and west-facing panels on the same MPPT string with a single-MPPT inverter. At 9am, your east panels are at peak production while your west panels are barely starting — the MPPT will be forced to choose a compromise voltage that underperforms both. This can cut system output compared to a proper dual-MPPT setup.
Direction Tips by Malaysian House Type
Malaysian homes have characteristic orientations based on how housing estates are planned. Here is what typically applies to your house type:
Terrace House
Most terrace houses in Malaysia are built in north-south rows, meaning the main roof faces east and west. This is actually ideal — you naturally get an east-west split without any planning required.
- Install panels on both east and west slopes for optimal self-consumption. Use a dual-MPPT string inverter to keep each side independent.
- If your terrace house only has space on one side, east is slightly preferable to west — morning generation aligns better with water heating and cooking loads.
Semi-Detached House
Semi-Ds in Malaysia often have more roof flexibility. Many are built with rooflines that face north and south, giving you the 'traditional' optimal south-facing option. Some have complex hip roofs with multiple faces.
- South-facing slope: maximize panels here first for highest output.
- If south slope is insufficient, add north-facing panels — they still produce 85-88% and the extra capacity adds up.
- For complex hip roofs with 4+ faces, micro inverters are the cleaner solution — they handle any orientation mismatch automatically.
Bungalow
Bungalows have the most roof flexibility — larger area, often multiple pitches, and the design freedom to optimize. You can usually install enough panels to meet 80-100% of your needs regardless of orientation.
- Prioritize the largest unshaded roof sections first, then fill remaining capacity on secondary orientations.
- For systems over 15kW, consider a 3-string setup with separate MPPTs for south, east, and west sections.
- Battery storage makes the most economic sense on larger bungalow systems — maximize self-consumption at all tariff rates.
Flat Roof (Including Commercial)
Flat roofs give you total orientation freedom. You can tilt panels at the optimal angle (10-20° in Malaysia) and face them in any direction using adjustable mounting systems.
- Single-direction: face all panels south at 15° tilt for maximum annual output.
- East-west rows: ballasted east-west mounting reduces structural load vs south-facing and doubles the panel density you can fit per square metre.
Pricing & ROI by Direction (5.58 kWp System, 2026)
The good news: even the 'worst' roof direction in Malaysia still gives you a strong ROI. Here is the full picture for a 5.58 kWp residential system:
| Direction | % of Optimal | Annual kWh | Annual Savings | Payback Period |
|---|---|---|---|---|
| South / Selatan | 100% | ~7,031 | RM 1,680 | 9.5 years |
| East-West Split | 92% (avg) | ~6,469 (total) | RM 1,540 | 10.4 years |
| East / Timur | 93% | ~6,539 | RM 1,560 | 10.3 years |
| West / Barat | 91% | ~6,398 | RM 1,520 | 10.5 years |
| North / Utara | 87% | ~6,117 | RM 1,460 | 11.0 years |
Note: South figures use Trexon's savings engine for the 5.58 kWp catalogue system (RM 15,999, Solis): 3.5 peak sun hours, 40% self-consumption, RP4 tariff, Solar ATAP export credited at the Energy Charge with unused credit forfeited monthly. Other directions are scaled by their share of optimal output. Actual savings depend on your TNB bill and usage pattern.
Key Takeaway
The difference between the best (south) and worst (north) direction in Malaysia is only about 1.5 years on payback period on the same system, and the sun still delivers about 87% of optimal output facing north. If your roof faces north, solar can still work; payback is about 11 years on the entry system, so check your own bill first.
How to Boost Savings Regardless of Direction
Frequently Asked Questions
South-facing produces the most total energy (100% of optimal). However, for self-consumption optimization under Solar ATAP, an east-west split is often better — it produces a flatter generation curve that aligns with household usage patterns throughout the day, which can increase the share of energy you self-consume (depending on your usage pattern).
No — direction matters much less in Malaysia. Because we are near the equator (1-7°N), the sun passes nearly overhead year-round. A north-facing panel in Germany produces less than 50% of optimal. In Malaysia, north-facing panels still produce 85-88%. Almost every Malaysian roof is viable for solar.
It depends on your usage pattern. All-south is best if you are home all day or have battery storage. East-west split is best for typical working households — it produces morning and afternoon power that matches when people are home. East-west systems can raise self-consumption, depending on the site.
You need either a string inverter with at least 2 independent MPPT inputs (like Sungrow SG8K-D or Huawei SUN2000-8KTL) or micro inverters. Never connect east and west panels on the same MPPT string — the production timing mismatch can cost you output. See our full string vs micro inverter guide for Malaysia.
Yes, absolutely. North-facing panels in Malaysia produce 85-88% of optimal — a 5.58 kWp north-facing system still generates approximately 6,117 kWh/year, saving roughly RM 1,460 annually on our engine basis. Payback is around 11.0 years vs 9.5 years for south-facing at Trexon's RM 15,999 entry price. Your own bill decides the real figure.
It is actually very good! Most Malaysian terrace houses naturally have east-west facing roofs — this is the ideal configuration for self-consumption under Solar ATAP. Install panels on both slopes, connect them to a dual-MPPT inverter, and you will have a morning-and-afternoon generation profile that matches household usage patterns excellently.
