ATAP · TNB · Rooftop Solar
Malaysia ATAP Solar ROI Calculator
Enter your usage or bill to compare rooftop solar size, total cost, payback, ROI, and 10-year value.
Malaysia Solar ROI
A TNB bill calculator and ATAP solar ROI calculator built for Malaysia homeowners
This tool is built specifically for Malaysia residential users, combining TNB General / ToU, bill structure, ATAP export offset, system cost, installment planning, and 10-year value to help you find the most cost-effective rooftop solar setup.
If you are searching for a Malaysia solar calculator, TNB bill calculator, ATAP calculator, solar ROI Malaysia, or rooftop solar Malaysia estimator, this page is designed for those real decision-making use cases.
Recommended system
6.5 kWp
Built on AIKO-A510-MAH60Mb to minimize bills.
Monthly Gen.
RM 0
Grid Import
-
Savings
-
Item
Unit rate
Before solar
After solar
Energy Charge-RM 0RM 0
Solar Export
-
RM 0
RM 0
AFA-RM 0RM 0
EEI-RM 0RM 0
Energy Subtotal-RM 0RM 0
Capacity Charge-RM 0RM 0
Network Charge-RM 0RM 0
Retail-RM 0RM 0
Service Tax-RM 0RM 0
KWTBB-RM 0RM 0
Total-RM 0RM 0
ROI
RM 0 / moInstallment
RM 0 / moAfter 10 years
RM 0 / moFAQ
Malaysia ATAP Solar ROI Calculator FAQ
01
Can I use this calculator if I only know my monthly bill?
Yes. Switch to bill input mode and the calculator will estimate monthly kWh from the current Malaysia residential TNB tariff, AFA, and ToU assumptions before continuing the solar sizing flow.
02
How is the recommended system size calculated?
The calculator first estimates the baseline TNB bill, then simulates different panel counts against bill reduction, self-use, export, and 10-year value before choosing a default recommendation. You can still override the panel count manually.
03
What happens after 10 years?
The page shows a separate “After 10 years” monthly TNB bill. It reflects the expected bill once ATAP export offset is no longer used and only self-consumption remains.
04
If my monthly TNB bill is around RM300, what solar size should I consider?
There is no single fixed answer. It depends on your monthly usage, daytime consumption share, single-phase or three-phase supply, and whether you include a battery. This calculator estimates usage first, then compares panel count, payback, and 10-year value.
05
Which is better for solar: TNB General or ToU?
It depends. ToU can be better or worse depending on your peak-period usage share, how much solar generation falls into peak hours, and how well export offset is utilized. This calculator evaluates both structures separately.
06
Do the single-phase 5 kW and three-phase 15 kW limits affect the recommendation?
Yes. The calculator keeps these common residential boundaries in the recommendation logic so the suggested system does not keep growing past typical household limits without constraint.
Sources
Official rules used by this Malaysia ATAP Solar ROI Calculator
SEDA
Solar ATAP official page
NEM 3.0 ended on June 30, 2025; ATAP starts on January 1, 2026 and allows excess generation to export to the grid for energy offset.
LIMIT
Technical assessment thresholds
Under the official process, residential users need extra technical assessment when exceeding 5 kW on single-phase or 15 kW on three-phase. This tool therefore prioritizes sizes that avoid the extra study.
TNB
TNB billing basis
From July 1, 2025, the new Peninsular Malaysia tariff structure starts from a 45.40 sen/kWh base tariff. Residential General and ToU are both split into Energy / AFA / Capacity / Network / Retail / EEI / ST / KWTBB. This tool currently follows the residential rates and thresholds from TNB page `v1.1.48`.