EV sales in Malaysia are growing, and the question every new EV owner eventually asks is: "Should I add solar panels?" The answer, once you run the numbers, is often yes. A solar plus EV charger combo can be a strong upgrade for EV owners in 2026 — and this guide walks through the numbers.
The Combined Savings Case: Solar + EV vs Petrol Car + TNB Grid
Baseline: Petrol Car + No Solar
- Monthly petrol consumption: 120 liters (typical Klang Valley commuter, 1,500 km/month)
- Petrol cost (RON 95 at RM 2.05/liter): RM 246/month
- Monthly TNB electricity bill for 600 kWh (RP4 domestic tariff): about RM 213/month
- Total monthly energy cost: about RM 459
After: EV + Solar System
- EV charging energy: 1,500 km ÷ 6 km/kWh (typical EV efficiency) = 250 kWh/month
- Home electricity without EV: 600 kWh/month (original household usage)
- Total monthly kWh needed: 850 kWh/month
- Solar system sized for this: 12.40 kWp (generates ~1,302 kWh/month at 3.5 sun-hours a day)
- Monthly TNB bill after solar: about RM 0 in the model (about RM 134 of the export credit exceeds the bill and is forfeited each month, so a slightly smaller system would waste less)
- Fuel cost (solar-charged EV): RM 0 (covered by solar generation)
- Total monthly energy cost: about RM 0
- Monthly savings: about RM 459 (vs RM 459 baseline)
- Annual savings: about RM 5,500 — Simplified estimate on the RP4 domestic tariff (from 1 Jul 2025), before AFA, the 1.6% RE Fund and service tax; 3.5 sun-hours a day; about 40% of solar used at home and the rest exported and credited at the 27.03 sen Energy Charge (capped at what you import) for 10 years under Solar ATAP; no tariff increases. Your bill and roof will change the figures.
Home EV Charger Options in Malaysia: What to Install
There are two types of home EV chargers relevant to Malaysian homeowners:
Type 1: AC Wall Box Charger (Level 2)
The standard for Malaysian homes. These single-phase or three-phase AC chargers connect to your home's distribution board and provide 7kW (single-phase) or 22kW (three-phase) charging speed.
| Charger Brand | Output Power | Phase | Smart Solar Integration | Market estimate (RM, installed) |
|---|---|---|---|---|
| Huawei iCharger (AC) | 7 kW | Single-phase | Yes — integrates with Huawei SUN2000 inverter | RM 3,200 – 4,500 |
| Wallbox Pulsar Plus | 7.4 kW | Single-phase | Yes — via Wallbox app with solar API | RM 3,800 – 5,200 |
| Tesla Wall Connector (Gen 3) | 7.4 kW | Single-phase | Yes — Tesla app (works best with Powerwall) | RM 4,200 – 5,800 |
| Schneider Electric EVLink | 7.4 kW | Single-phase | Limited (basic schedule control) | RM 2,800 – 3,800 |
| MYEV.io AC Charger | 7 kW | Single-phase | No | RM 1,800 – 2,500 |
Prices above are market estimates for reference. Trexon installs the Schneider Charge Pro (RM 6,499 installed); the other models are not stocked by Trexon.
Type 2: Solar-Smart EV Charging (Recommended)
The optimal setup for solar + EV owners is a smart EV charger that reads your solar inverter's output in real time and adjusts charging speed to match available solar excess. This is called "Solar Surplus Charging" or "Eco Mode" by different manufacturers.
How it works: When your solar panels generate more power than your home is consuming, the smart charger automatically increases the EV charging rate to absorb the excess. When solar production drops (clouds, afternoon shade), charging slows down or pauses to avoid drawing from the grid. The result: your EV charges almost exclusively on solar power, even without a battery storage system.
Key Insight: With solar surplus charging enabled on a 10kWp system, a typical EV owner driving 1,500km/month can charge 80–90% of their monthly driving purely from solar during the daytime — at zero marginal fuel cost.
Sizing Your Solar System for EV Charging in Malaysia
This is where most advisors get it wrong — they size solar for the existing home without factoring in the EV. Here is the correct approach:
Step 1: Determine your current household kWh consumption
Check your last 12 TNB bills. Find average monthly kWh. Example: 550 kWh/month.
Step 2: Add EV charging energy requirements
Calculate monthly driving distance ÷ EV efficiency:
- BYD Atto 3: 6.5 km/kWh (NEDC mixed cycle in Malaysia conditions)
- Tesla Model 3 RWD: 6.8 km/kWh
- Proton eMAS 5: 5.9 km/kWh
- Perodua EV (upcoming): ~6.0 km/kWh estimated
For 1,500 km/month in a BYD Atto 3: 1,500 ÷ 6.5 = 231 kWh/month extra
Step 3: Total new monthly kWh demand
550 (home) + 231 (EV) = 781 kWh/month
Step 4: Size the solar system
781 kWh ÷ 30 days = 26 kWh/day
26 kWh ÷ 3.5 peak sun hours ÷ 0.80 system efficiency = 9.3 kWp → install a 9.92 kWp system (the nearest package size)
Real Savings Calculation: BYD Atto 3 + 9.92kWp Solar, Kota Damansara
| Cost Category | Before Solar + EV | After Solar + EV | Monthly Saving |
|---|---|---|---|
| Petrol (Honda City 1.5L, 1,500km) | RM 246 | RM 0 | RM 246 |
| Home electricity (TNB) | RM 213 | RM 0 (modelled) | RM 213 |
| EV charging from grid | N/A | RM 0 (from solar) | RM 0 |
| Total monthly costs | RM 459 | RM 0 | RM 459 |
ROI Analysis: Total Investment and Payback
- 9.92 kWp solar system (Solis inverter): RM 23,999 (all-inclusive)
- Smart EV charger (Schneider Charge Pro, installed): RM 6,499
- Total investment: RM 30,498
- Monthly savings: RM 459
- Payback period: 30,498 ÷ 459 = 66.4 months (~5.5 years)
- Longer-term savings depend on your tariff, driving pattern and the 10-year Solar ATAP export credit. Simplified estimate on the RP4 domestic tariff (from 1 Jul 2025), before AFA, the 1.6% RE Fund and service tax; 3.5 sun-hours a day; about 40% of solar used at home and the rest exported and credited at the 27.03 sen Energy Charge (capped at what you import) for 10 years under Solar ATAP; no tariff increases. Your bill and roof will change the figures.
Which EVs Are Best Paired with Solar in Malaysia?
| EV Model | Est. Monthly Charging (1,500km) | Recommended Solar Size Add-on | Smart Charger Compatible |
|---|---|---|---|
| BYD Atto 3 / Seal | ~230 kWh | Add 2–3 kWp to existing system | Yes (Type 2) |
| Tesla Model 3 / Y | ~220 kWh | Add 2–3 kWp | Yes (Tesla Wall Connector) |
| Proton eMAS 5 / 7 | ~255 kWh | Add 3 kWp | Yes (standard AC charging) |
| BMW iX1 / i4 | ~210 kWh | Add 2 kWp | Yes (Wallbox integration) |
| Volvo EX30 / C40 | ~240 kWh | Add 2–3 kWp | Yes (standard AC charging) |
Installation Guide: Adding an EV Charger to Your Existing Solar System
- Assess current system capacity: Your existing solar system may have room to handle EV charging without upgrades, or it may need additional panels. Use our solar calculator to check.
- Electrical panel check: Adding a 7kW EV charger requires a dedicated 32A circuit breaker and appropriately rated cabling. Old distribution boards (DBs) may need upgrading (cost: RM 800–1,500).
- Choose a charger with solar integration: If you have a Huawei inverter, the Huawei iCharger is the simplest choice. For Sungrow inverter owners, Wallbox or Easee chargers have third-party Sungrow API integration.
- Configure solar surplus charging: Your installer should set up the charger to operate in "solar priority" mode, starting EV charging only when solar excess exceeds a set threshold (typically 2kW+).
- Consider timing: If you cannot always charge during peak solar hours (10am–3pm), schedule overnight charging at off-peak rates — or add a Huawei LUNA 2000 battery to store excess solar for evening charging.
Frequently Asked Questions
Can I charge a 3-phase EV charger (22kW) from solar panels?
Yes, but you need a 3-phase solar inverter (10kW+) and a 3-phase electrical supply. Most Malaysian terraced homes have single-phase supply. Converting to 3-phase has a separate cost through TNB; ask TNB for a quote. For most daily home charging needs, a 7kW single-phase charger is sufficient.
What happens when it rains and there's no solar — will my EV still charge?
Yes. Smart EV chargers automatically switch to grid charging when solar production is insufficient. You can set a minimum charging rate (e.g., 3.7kW even without solar) to ensure your car reaches its target charge level overnight.
Do I need TNB approval to add an EV charger to my home?
No separate TNB approval is needed for a home EV charger, as long as your total electrical load (including charger) stays within your approved TNB supply capacity. However, adding a 7kW charger to a home near its supply limit may trigger a capacity upgrade requirement.
Trexon installs complete solar plus EV charger packages — optimized for Malaysian conditions and compatible with all major EV brands. View our solar + EV charger packages or use the savings calculator to model your specific EV and driving pattern.
