What Solar System Size Do I Need in Malaysia 2026?｜RM200–RM1,500 TNB Bill Guide
What Solar System Size Do I Need in Malaysia 2026?｜RM200–RM1,500 TNB Bill Guide
Your monthly TNB bill can provide an initial indication of the solar system size you may need. However, the final capacity should also be based on electricity consumption in kWh, daytime usage, roof space, shading and the property’s electrical supply.
Quick Answer
A home with an RM200 to RM300 monthly TNB bill may begin by assessing a system of approximately 3kWp to 4kWp. A home with an RM1,000 or higher bill may require a system of 10kWp or more.
These are only preliminary estimates. The correct system should be sized using the latest electricity bill and actual usage pattern rather than the bill amount alone.
Estimated Solar Size Based on Monthly TNB Bill
| Monthly TNB Bill | Possible Solar Size | Approximate Panel Quantity | Indicative Roof Space |
|---|---|---|---|
| RM200–RM300 | 3–4kWp | Approximately 5–7 panels | Approximately 20–30m² |
| RM400–RM600 | 5–7kWp | Approximately 9–12 panels | Approximately 30–45m² |
| RM700–RM900 | 8–10kWp | Approximately 14–18 panels | Approximately 50–65m² |
| RM1,000–RM1,200 | 10–13kWp | Approximately 18–23 panels | Approximately 60–85m² |
| RM1,300–RM1,500+ | 13–15kWp or more | Approximately 23–27 panels or more | Approximately 80–100m² or more |
Panel quantities are estimated using modern high-output residential panels. Actual panel wattage, spacing, roof access, orientation and safety clearance will affect the final quantity and roof area required.
Why Your TNB Bill Alone Is Not Enough
Single-Phase vs Three-Phase Solar Capacity
Under Solar ATAP, the standard domestic capacity threshold is up to 5kW for a single-phase supply and up to 15kW for a three-phase supply.
A proposed system above the applicable threshold requires a Connection Confirmation Check and remains subject to technical approval. The system size shown in a quotation is therefore not automatically the final capacity that will be approved.
A Larger Solar System Is Not Always Better
Installing the maximum number of panels may not provide the best financial result if the home cannot use enough electricity during the day.
Under Solar ATAP, excess electricity credits must generally be used within the same billing period. An oversized system may therefore produce more exported electricity without delivering the same value as electricity consumed directly inside the property.
How to Choose the Right Solar Size
- Use at least six to twelve months of electricity bills where available
- Check the monthly consumption in kWh, not only the total amount in RM
- Estimate how much electricity is used during daylight hours
- Confirm whether the property has single-phase or three-phase supply
- Assess roof dimensions, orientation, shading and structural condition
- Compare estimated generation from more than one suitable installer
Do You Need Extra Capacity for a Solar Battery or EV?
A future battery or electric vehicle does not automatically mean the roof should be filled with more panels immediately. The installer should first estimate future electricity usage, charging time and battery capacity.
Homeowners planning an EV or battery may consider a battery-ready inverter, suitable electrical protection and enough roof space for future expansion.
Estimate the Right Solar Size for Your Home
Use your monthly bill to estimate system capacity and potential return, check battery suitability, or request recommendations for solar installers that cover your area.
Frequently Asked Questions
How many solar panels do I need for an RM500 TNB bill?
An initial assessment may consider approximately 5kWp to 7kWp, or around 9 to 12 modern high-output panels. The actual size depends on kWh usage, daytime consumption and roof conditions.
Can a single-phase home install more than 5kW?
A proposal above the standard 5kW single-phase threshold requires a Connection Confirmation Check and remains subject to technical approval.
Should solar be sized based on the highest monthly bill?
Not necessarily. A better assessment uses several months of electricity consumption to identify normal usage, seasonal changes and daytime demand.
Aug 04,2026