Malaysia Solar ROI Calculator 2026 | Estimate Solar Cost, TNB Savings & Payback Period
Malaysia Solar ROI Estimator: Check Your True Payback Period Under the 2026 ATAP Framework
Many Malaysian homeowners and business owners want to know one thing before installing solar panels: how many years will it take to recover the cost?
The answer depends on your monthly TNB bill, property type, roof condition, solar system size, daytime self-consumption and the latest Solar ATAP framework. This Solar100 estimator is designed to give you a practical starting point before you request quotations from solar installers.
This is a solar ROI estimator, not an official TNB billing tool. It uses simplified assumptions based on Malaysia rooftop solar conditions and the 2026 Solar ATAP framework. Actual savings and payback period must be confirmed through your latest TNB bill, site assessment and installer quotation.
Solar ROI Estimator Based on 2026 ATAP Framework
Under the Solar ATAP framework, solar electricity should be used by your property first. Any surplus energy exported to the grid may receive bill credit within the same billing period. Unused export credit cannot be carried forward, which means correct system sizing and daytime self-consumption are important.
Solar100 ROI Estimator
Adjust the settings below to estimate your solar system size, monthly savings and payback period.
This is used as a practical capacity warning for residential users. Final approval depends on technical assessment and latest official requirements.
Higher percentage means more solar electricity is used directly during sunlight hours instead of exported.
Estimated Monthly Usage: -- kWh
Recommended System Size: -- kWp
Estimated Monthly Solar Generation: -- kWh
Estimated Self-Consumed Solar: -- kWh
Estimated Exported Solar: -- kWh
Export Credit Rate Used: RM -- / kWh
Estimated Total System Cost: RM --
Estimated Monthly Savings: RM --
⚠️ ATAP No Rollover Reminder: Around RM 0 of estimated export credit may not be fully used in this billing period. This may happen when the system is oversized or daytime self-consumption is too low.
⚠️ Capacity Reminder: The calculated system size may exceed the typical residential capacity limit selected. The result has been capped for estimation. Final capacity depends on technical assessment and latest official approval.
Estimated Payback Period: -- Years
Assumptions: estimated Malaysia solar yield of 95 kWh per kWp per month, simplified residential tariff reverse estimate, estimated system cost based on system size, and ATAP-style monthly credit limitation. This is not an official quotation or TNB bill calculation.
How This Estimator Is Different From a Basic ROI Calculator
A normal solar calculator may simply divide your electricity bill by an average rate and estimate savings. That is too simple for the 2026 Solar ATAP framework.
This version considers:
- Monthly TNB bill amount
- Estimated electricity usage in kWh
- Residential or commercial property type
- Daytime self-consumption percentage
- Estimated export credit rate
- Monthly no-rollover limitation
- Estimated Maximum Allowable Quantity concept for export credit
- Residential system size warning for single phase and three phase users
Why Daytime Self-Consumption Matters Under Solar ATAP
Under Solar ATAP, the most valuable solar energy is usually the electricity you use directly at your property during the day. For example, if your air-conditioner, pumps, office equipment, machinery or appliances run while the solar system is generating power, you reduce the amount of electricity you import from the grid.
Surplus solar energy exported to the grid may still receive bill credit, but the treatment depends on whether you are a domestic or non-domestic user. Unused export credit in the same billing period cannot be carried forward. This is why oversizing a system may reduce ROI.
Residential vs Commercial Solar ROI
| User Type | Export Credit Treatment | What Matters Most |
|---|---|---|
| Residential / Domestic | Export credit is estimated using applicable Energy Charge assumptions. | Monthly bill, roof space, phase type, self-consumption and system sizing. |
| Commercial / Non-Domestic | Export credit is estimated using Average SMP input. | Daytime load, operating hours, roof area, load profile and installer proposal. |
Solar ATAP Policy Reminder:
Solar ATAP programme terms, tariff components, Average SMP and technical requirements may change over time. Always confirm the latest details with qualified installers, SEDA, TNB or relevant official channels before making a final decision.
How to Use the Result
If your estimated payback period looks reasonable, the next step is not to immediately choose the cheapest solar package. Instead, compare proper installer proposals and check whether the system size is suitable for your actual usage and roof condition.
Ask installers to explain:
- Recommended system size and why it was selected
- Estimated monthly generation
- Expected self-consumption and export ratio
- Solar panel and inverter brands
- Warranty and workmanship coverage
- Monitoring system and after-sales support
- Application process and timeline
- Estimated savings assumptions
Want Solar100 to Check Your Solar Suitability?
Send us your area, property type and average monthly TNB bill. We can help you do a basic suitability check before you request quotations from solar installers.
16 Apr 2026
