Commercial Solar Installation Process

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Commercial Solar Installation Process Explained

7 July 2026

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Introduction

Businesses across Malaysia are increasingly investing in commercial solar systems to reduce electricity costs, improve sustainability, and gain better control over long-term energy expenses. However, many business owners are unsure about what actually happens during a commercial solar installation.

Understanding the installation process can help you plan ahead, minimise disruptions to your operations, and ensure your solar project runs smoothly. This guide explains each stage of a typical commercial solar installation from the initial assessment to system activation.

Commercial Solar Installation Process Explained

Initial Site Assessment
Energy Consumption Analysis
System Design and Proposal
Quotation and Project Approval
Regulatory Approvals
Equipment Procurement
Roof Preparation
Mounting System Installation
Solar Panel Installation
Electrical Installation
System Testing and Commissioning
Grid Connection
Monitoring System Setup
Training and Handover

Update: NEM Has Ended, Solar ATAP Takes Over

2026 update: The NEM (Net Energy Metering) scheme officially ended on 30 June 2025 and is no longer accepting new registrations. The current replacement programme is Solar ATAP (Solar Accelerated Transition Action Programme), effective from 1 January 2026, with cash rebates up to RM3,000 through SuRIA Home. Read the full Solar ATAP guide here →

1. Initial Site Assessment

Every commercial solar project begins with a detailed site assessment. Solar professionals inspect your building to determine whether it is suitable for solar panel installation.

During the assessment, they evaluate:

Roof size and usable space
Roof orientation and tilt
Structural condition of the building
Existing electrical infrastructure
Potential shading from nearby buildings or trees
Current electricity consumption

This information allows engineers to determine the most suitable system size and expected energy generation.

2. Energy Consumption Analysis

Before designing the solar system, the installer analyses your electricity bills and energy usage patterns.

This helps determine:

Monthly electricity consumption (kWh)
Peak demand periods
Daytime energy usage
Future business expansion plans
Opportunities to maximise self-consumption

A properly sized solar system delivers the best return on investment while avoiding unnecessary installation costs.

3. System Design and Proposal

Once the assessment is complete, engineers create a customised solar system design based on your business needs.

The proposal usually includes:

Recommended system capacity (kWp)
Estimated annual energy production
Number of solar panels
Inverter specifications
Roof layout drawings
Estimated electricity savings
Project cost
Return on investment (ROI)
Estimated payback period

Modern design software also simulates how much electricity the system will generate throughout the year.

4. Quotation and Project Approval

After reviewing the proposal, your business can proceed with project approval.

At this stage, discussions usually cover:

Project timeline
Payment schedule
Warranty coverage
Equipment brands
Installation schedule
Maintenance options

Once approved, procurement and documentation begin.

5. Regulatory Approvals

Commercial solar installations in Malaysia require approvals from relevant authorities before installation can proceed.

These may include:

Utility approval
Grid connection application
Engineering documentation
Safety compliance
Local authority requirements (where applicable)

Working with an experienced solar installer ensures these applications are handled correctly and efficiently.

6. Equipment Procurement

After approvals, the installer orders all required equipment.

Typical components include:

Solar panels
Solar inverters
Mounting structures
DC and AC cables
Safety isolators
Monitoring devices
Protection equipment

Most commercial projects use Tier-1 solar panels and high-quality inverters for maximum reliability and long-term performance.

7. Roof Preparation

Before installation begins, technicians inspect the roof again to ensure it is ready for mounting.

This includes:

Safety setup
Roof cleaning
Identifying mounting locations
Verifying structural integrity
Installing safety equipment

If repairs are needed, they should be completed before the solar panels are installed.

8. Mounting System Installation

The mounting system forms the foundation of the solar array.

Installers securely attach mounting rails to the roof structure while ensuring:

Proper waterproofing
Correct panel spacing
Wind load resistance
Compliance with engineering standards

The mounting structure is designed to withstand Malaysia's tropical weather conditions.

9. Solar Panel Installation

Once the mounting system is complete, technicians install the solar panels.

Each panel is:

Positioned according to the engineering design
Securely fastened
Connected using weather-resistant cabling
Properly grounded for electrical safety

Careful installation ensures optimal energy production and long-term durability.

10. Electrical Installation

Qualified electricians connect the solar panels to the inverter and the building's electrical system.

This stage involves:

DC wiring
AC wiring
Inverter installation
Protection devices
Circuit breakers
Earthing system
Isolation switches

All electrical work must comply with Malaysian safety standards.

11. System Testing and Commissioning

Before the system is activated, engineers conduct comprehensive testing.

They verify:

Electrical safety
Correct wiring
Inverter performance
Monitoring system operation
Voltage and current readings
Grid synchronisation
Overall system performance

Any issues identified during testing are resolved before commissioning.

12. Grid Connection

Once testing is complete and all approvals are in place, the system is connected to the electricity grid.

The installer ensures the solar system operates safely alongside your existing power supply.

If your system is connected under an approved grid scheme, electricity generation will begin immediately after activation.

13. Monitoring System Setup

Most modern commercial solar systems include online monitoring platforms.

Business owners can track:

Real-time electricity generation
Daily energy production
Monthly performance
System health
Historical data
Carbon emission reductions

Monitoring allows issues to be identified early and ensures the system performs at its best.

14. Training and Handover

After commissioning, the installer provides system training for your team.

This usually includes:

Understanding the monitoring platform
Basic system operation
Safety procedures
Maintenance recommendations
Warranty documentation
Emergency contacts

A complete handover package is provided for future reference.

Frequently Asked Questions

Q: What happens during the initial site assessment for a commercial solar project?

A: Solar professionals inspect the building to check roof size and usable space, orientation and tilt, structural condition, existing electrical infrastructure, and potential shading, along with current electricity consumption, to determine the most suitable system size.

Q: Why is energy consumption analysis important before designing a commercial solar system?

A: Analysing electricity bills and usage patterns helps determine monthly consumption, peak demand periods, daytime usage, and future expansion plans, which ensures the system is properly sized for the best return on investment.

Q: Can an undersized or oversized system affect ROI?

A: Yes. A properly sized solar system delivers the best return on investment, while sizing that does not match actual usage patterns can lead to unnecessary installation costs or missed savings.

Q: Does shading from nearby buildings or trees affect the installation plan?

A: Yes, potential shading is one of the factors assessed during the site inspection since it affects panel placement and expected energy generation.

Q: Is the NEM programme still relevant for new commercial solar installations?

A: No. NEM ended on 30 June 2025 and is no longer accepting new registrations; it has been replaced by Solar ATAP, effective from 1 January 2026, which offers cash rebates up to RM3,000 through SuRIA Home.