Solar100 Malaysia Solar ATAP Capacity Guide

What Solar System Capacity Can Be Installed Under Solar ATAP?

Last updated: July 2026

The maximum solar capacity allowed under Solar ATAP depends primarily on whether the electricity account is domestic or non-domestic. Domestic single-phase consumers may install up to 5 kW, while domestic three-phase consumers may install up to 15 kW. Non-domestic consumers may propose a system of up to 100% of their Maximum Demand, subject to technical assessment and an overall programme limit of 1,000 kW.

Quick Answer Under Solar ATAP, the published maximum capacity for a domestic single-phase account is 5 kW, and the published maximum for a domestic three-phase account is 15 kW. A non-domestic account may apply for up to 100% of its Maximum Demand, subject to the required technical assessment, network conditions and a maximum limit of 1,000 kW. These are programme ceilings, not automatic approvals or recommended system sizes. The actual approved and financially suitable capacity may be lower.

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What Are the Main Solar ATAP Capacity Limits?

Domestic Single Phase Up to 5 kW

Applies to eligible domestic electricity accounts using a single-phase supply.

Domestic Three Phase Up to 15 kW

Applies to eligible domestic electricity accounts using a three-phase supply.

Non-Domestic Up to 1,000 kW

Limited to 100% of Maximum Demand, subject to technical assessment and the overall programme cap.

Capacity Limits Are Not Guaranteed Approvals: The proposed capacity must still comply with electricity-account information, technical requirements, connection conditions, roof suitability and the capacity stated in the approved Solar ATAP application.

How Is Solar ATAP Capacity Determined for Domestic Consumers?

Domestic consumers are divided according to their electricity supply type. The programme publishes a separate maximum capacity for single-phase and three-phase domestic accounts.

Electricity Account Category

The account must be recognised under the applicable domestic consumer category.

Supply Phase

The property’s single-phase or three-phase supply determines the published domestic capacity ceiling.

Roof and Electrical Conditions

The system must fit the available roof and comply with the property’s electrical installation requirements.

Approved Application

The installed capacity should match the capacity approved through the applicable Solar ATAP process.

The Maximum Is Not a Minimum: A domestic consumer can apply for a system smaller than 5 kW or 15 kW if that size better matches the property’s electricity usage, roof area and budget.

How Much Solar Can a Single-Phase Home Install?

A domestic consumer with a single-phase electricity supply may install up to 5 kW under the published Solar ATAP capacity limit.

Published Ceiling Up to 5 kW for an eligible domestic single-phase electricity account.

Possible Smaller Systems The applicant may choose a lower capacity based on electricity use, roof area or financial considerations.

Supply Verification The Registered PV Service Provider should verify the existing supply type before proposing the system.

Application Capacity The proposed inverter and installed capacity should be clearly stated in the eATAP application.

Do Not Assume Every House Has Three-Phase Supply: Larger houses, higher electricity bills or multiple air conditioners do not automatically confirm that the property uses a three-phase supply.

How Much Solar Can a Three-Phase Home Install?

A domestic consumer with a three-phase electricity supply may install up to 15 kW under the published Solar ATAP capacity limit.

Higher Published Capacity

Three-phase domestic accounts have a higher programme ceiling than single-phase domestic accounts.

Not Automatically the Best Size

A 15 kW system may be unnecessarily large where daytime electricity usage is low.

Roof Space Is Still Required

The roof must have sufficient usable area after allowing for shading, setbacks, access and structural conditions.

Export Rules Still Apply

Excess generation remains subject to Solar ATAP export, billing and same-period offset rules.

A Larger Limit Does Not Guarantee Greater Savings: Savings depend on generation, self-consumption, export treatment, electricity tariff, system cost and long-term operating performance.

How Much Solar Can a Non-Domestic Consumer Install?

A non-domestic Solar ATAP consumer may propose a solar PV system of up to 100% of the account’s Maximum Demand, subject to technical assessment and an overall maximum capacity of 1,000 kW.

Non-domestic users may include eligible commercial, industrial, institutional or other business electricity accounts. The permitted capacity is not determined solely by available roof space or annual electricity consumption.

Maximum Demand Rule The proposed capacity is limited to no more than 100% of the applicable Maximum Demand.

Overall Programme Cap Even where Maximum Demand is above 1 MW, the published Solar ATAP limit remains 1,000 kW.

Technical Assessment The allowable capacity remains subject to the relevant connection and network assessment.

Actual Approval May Be Lower Technical constraints may result in an approved capacity below the amount initially proposed.

Annual Consumption Is Not the Same as Maximum Demand: A business may consume a large amount of electricity annually but still have a Maximum Demand that limits the Solar ATAP system to a lower capacity.

How Is Maximum Demand Used to Calculate Commercial Solar Capacity?

Maximum Demand measures the highest applicable level of electrical demand recorded or recognised for the non-domestic account. Under Solar ATAP, the proposed solar capacity may be up to 100% of this Maximum Demand, subject to the 1,000 kW overall limit and technical approval.

Maximum Demand Example	Programme-Based Capacity Ceiling	Important Qualification
100 kW Maximum Demand	Up to 100 kW	Subject to technical assessment and approval
350 kW Maximum Demand	Up to 350 kW	Subject to technical assessment and approval
800 kW Maximum Demand	Up to 800 kW	Subject to technical assessment and approval
1,200 kW Maximum Demand	Up to 1,000 kW	Restricted by the Solar ATAP overall maximum

Examples Are Not Project Approvals: They illustrate the general 100% Maximum Demand rule only. The actual capacity must be determined from valid account records and the relevant technical process.

Why Can Technical Assessment Affect the Approved Capacity?

A solar system exports and interacts with the electricity network. Technical assessment helps determine whether the proposed system can be safely connected without creating unacceptable voltage, protection, reverse-power-flow or network-operating issues.

Existing supply type
Voltage level
Proposed installed capacity
Proposed inverter capacity
Point of interconnection
Transformer capacity
Distribution-network conditions
Existing generation in the area
Reverse-power-flow conditions
Voltage-rise assessment
Protection-system requirements
Power-quality requirements
Single-line diagram
Metering arrangement
Maximum Demand records
Required CCC, CAS or PSS

The Network May Not Accept the Full Proposed Capacity: The technical assessment may approve the proposed capacity, require modifications, impose conditions or support a lower capacity.

Is the Maximum Solar ATAP Capacity Always the Best System Size?

No. The maximum allowed capacity is a regulatory ceiling. The most suitable system size should also reflect actual electricity usage, daytime demand, roof conditions, export-credit treatment, budget and expected operating period.

Sizing Factor	Why It Matters
Daytime Electricity Usage	Higher daytime usage can increase direct solar self-consumption
Weekend and Holiday Loads	Low non-working-day demand may increase exported electricity
Roof Orientation and Shading	Usable generation can differ even where the same capacity is installed
Solar ATAP Export Treatment	Exported electricity may not have the same value as direct self-consumption
Ten-Year Solar ATAP Period	Financial modelling should account for operation after the export arrangement ends
System Cost	Additional panels may extend the payback period if their output is mainly exported or forfeited

Compare at Least Two System Sizes: A proposal should show how a smaller and larger system would affect self-consumption, exports, annual savings, project cost and estimated payback.

Can Roof Conditions Reduce the Installable Capacity?

Yes. The Solar ATAP programme limit does not guarantee that the property can physically accommodate that amount of solar capacity.

Usable Roof Area

Water tanks, air-conditioning equipment, skylights and access routes can reduce the space available for panels.

Shading

Trees, adjacent buildings, roof structures and equipment can affect where panels should be installed.

Structural Condition

The roof and supporting structure must be suitable for the proposed solar mounting system and loads.

Safety and Maintenance Access

Adequate access may be required for installation, emergency response, inspection, cleaning and future replacement.

Panel Count Alone Is Not a Capacity Assessment: A provider should inspect the roof layout, structure, shading and electrical connection before confirming the final system size.

How Is the Proposed Capacity Confirmed during the Application?

Review the Electricity Account

The provider checks whether the account is domestic or non-domestic and confirms its supply characteristics.

Review Electricity Usage

Electricity bills, Maximum Demand and load information are examined.

Assess the Site

Roof area, orientation, shading, structure and electrical connection are reviewed.

Propose a System Size

The Registered PV Service Provider recommends a capacity within the applicable programme limit.

Complete Technical Assessment

The required connection check or study is completed where applicable.

Submit the Capacity for Approval

The proposed system and supporting technical information are submitted through the eATAP process.

Can the Installed Capacity Be Different from the Approved Capacity?

The completed installation should correspond with the capacity, equipment and technical arrangement approved through the applicable Solar ATAP process.

Installing capacity above the approved amount, changing major equipment or materially altering the connection arrangement may create contractual, technical, metering, licensing or programme-compliance issues.

Smaller Final Capacity Confirm whether application records or approved documents must be amended before installation.

Larger Final Capacity Do not install additional capacity without checking whether a revised assessment and approval are required.

Different Inverter Check whether the replacement model and rating comply with approved technical documentation.

Future Expansion Treat later expansion as a regulated project change rather than an automatic extension of the original approval.

Do Not Rely on Verbal Approval: Material capacity or equipment changes should be documented through the appropriate RPVSP and official process before work proceeds.

Solar ATAP Capacity Limits at a Glance

Consumer Category	Published Capacity Limit	Main Basis	Important Qualification
Domestic Single Phase	Up to 5 kW	Supply phase	Subject to application, site and technical requirements
Domestic Three Phase	Up to 15 kW	Supply phase	Subject to application, site and technical requirements
Non-Domestic below 1 MW Maximum Demand	Up to 100% of Maximum Demand	Maximum Demand	Subject to technical assessment
Non-Domestic above 1 MW Maximum Demand	Up to 1,000 kW	Overall Solar ATAP cap	Subject to technical assessment

What Is the Difference between Solar100 and the Solar Provider?

Solar100	Registered Solar Provider
Explains the general Solar ATAP capacity rules	Checks the applicant’s electricity account and supply type
Helps users compare participating providers	Reviews electricity bills, loads and Maximum Demand
Highlights system-sizing considerations	Performs or coordinates the site assessment
Does not determine the official approved capacity	Prepares the project-specific proposed capacity
Does not perform technical connection studies	Coordinates the applicable technical assessment
Does not submit the official eATAP application	Submits and manages the relevant application
Does not install or commission the solar system	Performs or coordinates installation and commissioning
Does not guarantee savings or approval	Provides project estimates and contractual responsibilities

Solar100 Is a Discovery and Comparison Platform: The appointed Registered PV Service Provider remains responsible for the project-specific design, application, technical documents, installation and contractual commitments.

What Should Applicants Ask about Solar ATAP Capacity?

Is my electricity account domestic or non-domestic?
Does my home have single-phase or three-phase supply?
What is the maximum capacity allowed for my account?
What system capacity do you recommend?
Why is the recommended capacity lower than the maximum?
How much usable roof area is available?
How many panels will be installed?
What is the total panel capacity?
What is the inverter AC capacity?
Which capacity will appear in the eATAP application?
What Maximum Demand figure is being used?
Which electricity bills support the Maximum Demand calculation?
Does the proposal require a CCC, CAS or PSS?
Could the technical study reduce the proposed capacity?
How much solar will be consumed directly?
How much electricity is expected to be exported?
Could any exported electricity be forfeited?
Can the system be expanded later?
What approval is needed for future expansion?
What happens if the installed capacity differs from approval?

Request a Capacity and Energy-Flow Comparison: The proposal should compare at least two system sizes and show expected generation, self-consumption, exports, annual savings, project cost and estimated payback for each option.

What Information Is Needed to Estimate the Suitable Capacity?

Recent TNB electricity bills
TNB account number
Domestic or non-domestic tariff category
Single-phase or three-phase supply
Supply-voltage level
Maximum Demand records, where applicable
Monthly electricity consumption
Daytime load information
Weekend electricity usage
Public-holiday electricity usage
Operating hours
Planned future electrical loads
Roof photographs
Roof dimensions
Roof orientation
Known shading conditions
Main switchboard photographs
Existing meter photographs

Frequently Asked Questions

What is the Solar ATAP limit for a single-phase home?

The published maximum capacity for an eligible domestic single-phase electricity account is 5 kW.

What is the Solar ATAP limit for a three-phase home?

The published maximum capacity for an eligible domestic three-phase electricity account is 15 kW.

How much solar can a non-domestic consumer install?

A non-domestic consumer may apply for up to 100% of Maximum Demand, subject to technical assessment and a maximum limit of 1,000 kW.

Does the maximum limit guarantee approval?

No. The actual approved capacity depends on the application, supporting records, technical assessment and network conditions.

Must a homeowner install the full 5 kW or 15 kW?

No. A smaller system may be selected where it better matches electricity usage, roof area, budget or expected self-consumption.

Can the solar system be expanded after approval?

Expansion should not be treated as automatic. The owner should first check whether a revised technical assessment, application or approval is required.

The information on this page is provided for general educational and comparison purposes. It is not an official capacity approval, engineering design, connection-assessment result, structural assessment, electricity account determination, legal interpretation or savings guarantee. The permitted and approved solar capacity depends on the latest official Solar ATAP guidelines, the consumer category, supply phase, Maximum Demand, voltage level, technical assessment, network conditions, property information, approved equipment and application records. Solar100 is a solar discovery and comparison platform. It is not SEDA Malaysia, the Energy Commission, TNB, an electricity utility, Registered PV Service Provider, solar installer, electrical contractor, engineering consultant, regulator or government authority. Applicants should obtain a project-specific site assessment, capacity calculation, technical confirmation and written proposal from a qualified Registered PV Service Provider before proceeding.

Find a Suitable Solar ATAP Capacity for Your Property

Send your recent TNB bills, supply type, tariff category, Maximum Demand, roof photographs, operating hours and future electricity plans to compare suitable system capacities from participating registered solar providers.

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