Solar100 Malaysia Solar Installation Guide

What Happens During Solar Testing and Commissioning?

Updated: July 2026

Solar testing and commissioning take place after the panels, inverter, cabling, isolators, protection devices and monitoring equipment have been installed. The installer or appointed competent person checks whether the completed system matches the approved design, has been installed safely, operates correctly and is ready for handover or activation under the applicable project arrangement.

Quick Answer Testing and commissioning normally include a visual inspection, mounting and cable checks, DC polarity testing, voltage measurement, insulation resistance testing, earthing verification, protection-device checks, inverter startup, monitoring configuration and confirmation that the system generates electricity as expected. Any defects should be corrected before final commissioning records, completion certificates, monitoring access and operating instructions are handed to the customer.

✓ SEDA-Related Standards Review

✓ SSM Registration Information Review

✓ Policy & Application Process Review

✓ After-Sales Support Assessment

✓ Consultation & Quotation Comparison

Why Are Solar Testing and Commissioning Important?

Solar installation involves electrical equipment operating at potentially hazardous voltages. Testing and commissioning help verify that the completed system has been installed according to the approved design, manufacturer instructions, agreed scope and applicable electrical requirements.

Confirm Safe Installation

Testing helps identify reversed polarity, damaged insulation, loose connections, incorrect protection or other conditions that may create electrical risk.

Confirm Correct Operation

The inverter, monitoring equipment, protection devices and solar strings are checked to confirm that they operate as intended.

Record Final System Condition

Commissioning readings and inspection records create a baseline for future maintenance, warranty claims and performance review.

Support Final Handover

The completed records help confirm what was installed, tested and handed over to the owner.

Commissioning Is Not Just Switching On the Inverter: A proper process should inspect the physical installation, test the electrical system, verify protection, configure the inverter, confirm monitoring and document the final results.

What Is Checked During the Visual and Mechanical Inspection?

Before energising the system, the installer should inspect the completed work for visible defects, incomplete work, incorrect equipment placement and conditions that could affect safety or long-term reliability.

Panel model and quantity
Panel orientation
Panel alignment
Mounting-rail alignment
Clamp position
Fastener tightness
Roof attachment points
Broken or damaged roof tiles
Waterproofing condition
Roof drainage
Maintenance walkways
Cable support
Cable sagging
Cable exposure to sharp edges
Connector condition
Connector compatibility
Conduit condition
Cable-tray condition
Equipment labelling
Warning labels
Inverter mounting
Inverter ventilation clearance
Isolator location
Switchboard modification
Protection from accidental impact
General workmanship

Roof and Mounting The structure should appear secure, correctly aligned and free from obvious damage that could affect the roof or solar array.

Cables and Connectors Cables should be supported, protected and routed away from water, movement, sharp surfaces and unnecessary heat.

Inverter and Isolators Equipment should be securely mounted, labelled, ventilated and accessible for operation and maintenance.

Switchboard Work New protection devices, labels and connections should match the final electrical design and installed system.

Visible Defects Should Be Corrected Before Energisation: Loose cables, damaged connectors, broken tiles, blocked inverter ventilation or incomplete labels should not be treated as minor handover items when they affect safety or reliability.

What Tests Are Performed on the DC Side?

The DC side includes the solar panels, string wiring, connectors, DC isolators and the connection to the inverter. These circuits may remain energised whenever the panels receive light, so testing must be carried out using suitable procedures and equipment.

DC Test	What It Checks	Possible Issue Identified
Polarity Test	Confirms that positive and negative conductors are connected correctly.	Reversed polarity, incorrect string connection or wiring error.
Open-Circuit Voltage Test	Measures the voltage of each string before normal operation.	Missing panels, incorrect string length, open circuit or wiring fault.
Current Measurement	Compares string current where the test method and conditions allow.	Shading, disconnected modules, damaged wiring or inconsistent string performance.
Insulation Resistance Test	Checks the insulation between live conductors and earth.	Damaged cable insulation, moisture entry, connector problems or earth leakage.
Continuity Check	Confirms the intended electrical path and bonding arrangement.	Broken conductors, missing bonds or incomplete connections.
Connector Inspection	Confirms connector condition, engagement and compatibility.	Loose connection, mixed connector types, contamination or heat risk.

DC-side verification may include:

String identification
String polarity
String open-circuit voltage
String current where applicable
Insulation resistance
DC cable continuity
Connector engagement
Connector compatibility
DC isolator operation
DC fuse rating where used
DC surge-protection condition
Cable labelling
String labelling
Correct inverter input allocation
Correct MPPT allocation
Unused input sealing
Cable-entry sealing
Mechanical cable protection

String Results Should Be Compared with the Final Design: Unexpected voltage or current differences may indicate a design mismatch, missing module, shading issue, wiring error or defective component.

What Tests Are Performed on the AC Side?

The AC side connects the inverter to the property’s distribution system. Testing helps verify that the inverter has the correct supply conditions, protective devices, cable connections and isolation arrangements.

AC supply voltage
Supply frequency
Phase identification
Phase sequence where applicable
Neutral connection
Protective-conductor continuity
AC cable insulation
Circuit-breaker rating
Residual-current protection where applicable
AC isolator operation
Surge-protection condition
Switchboard connection
Connection tightness
Cable size
Voltage-drop assumptions
Labelling
Metering connection
Export-control connection where applicable
Backup-circuit connection where applicable
Emergency-isolation arrangement

Supply Voltage

The inverter requires acceptable grid voltage before it can connect and operate normally.

Supply Frequency

The inverter checks grid frequency and should disconnect if operating conditions fall outside permitted settings.

Protection Devices

Circuit breakers, isolators, surge protection and other protective equipment should match the final system design.

Connection Quality

Loose or poorly terminated AC connections can create heat, voltage drop and reliability problems.

Switchboard Capacity Should Be Confirmed: Commissioning should not proceed if the connection point, protection equipment or cable arrangement does not match the approved design or safe operating requirements.

How Are Earthing and Protection Systems Checked?

Earthing and protective devices help reduce the risk of electric shock, fire, equipment damage and unsafe operation. The final arrangement should match the system design and the requirements applicable to the property.

Protective Earthing Metal equipment, mounting components and electrical enclosures are checked according to the required bonding and earthing arrangement.

Surge Protection DC and AC surge-protection devices may be checked for correct rating, connection and status indication.

Overcurrent Protection Breakers and fuses are checked against the cable size, inverter output and final electrical design.

Isolation DC and AC isolators should be accessible, labelled and capable of disconnecting the relevant circuit.

Protection checks may include:

Earthing continuity
Protective bonding
Mounting-system bonding where required
Inverter-earth connection
Switchboard-earth connection
DC surge-protection device
AC surge-protection device
Protection-device rating
Protection-device coordination
Residual-current protection where required
Anti-islanding operation
Grid-disconnection settings
Emergency shutdown
Isolation labels
Warning signs
Firefighter or emergency information where required

Protection Settings Should Not Be Changed Casually: Inverter grid settings, trip values and protection parameters should match the approved technical requirements and should only be changed by authorised technical parties.

What Happens During Inverter Startup?

After the physical and electrical checks are completed, the inverter is started according to the manufacturer’s procedure. The equipment checks the DC input, grid conditions, internal protection and communication status before connecting and producing power.

Confirm Safe Conditions

Verify that covers, isolators, switchboards, cables and protection equipment are ready for energisation.

Energise the AC Supply

Provide the inverter with the required grid supply and confirm that voltage and frequency are acceptable.

Connect the DC Input

Operate the applicable DC isolators and confirm that the inverter recognises the solar strings.

Configure System Settings

Confirm country, grid, export-control, communication and system settings for the approved installation.

Check Operating Status

Review warning lights, fault codes, input readings, output power and grid-connection status.

Record Commissioning Data

Save the final settings, test readings, serial numbers and operating condition for the handover record.

Startup May Be Delayed by Grid Conditions: An inverter may remain in standby or display a fault if voltage, frequency, insulation, communication or protection conditions are not acceptable.

How Are Monitoring and System Performance Checked?

Monitoring allows the customer and service provider to review generation, inverter status, alerts and historical performance. The commissioning team should confirm that the monitoring system receives accurate data and that the customer can access it.

Inverter serial number
Monitoring account creation
Site registration
Internet connection
Wi-Fi or data connection
Communication-device status
Time-zone setting
System-capacity setting
Panel and inverter information
Live generation reading
Daily generation reading
Import and export data where available
Battery data where applicable
Alarm notification
Customer login access
Installer access
Data-privacy settings
Monitoring manual
Expected reporting delay
Support contact for monitoring faults

Performance Check	What It Confirms	Important Limitation
Live Power Output	Confirms that the inverter is producing power under current sunlight conditions.	Output changes with sunlight, temperature, shading and load.
String Comparison	Helps identify unexpected differences between similar solar strings.	Roof direction and shading may create legitimate differences.
Daily Generation	Confirms that generation data is being recorded.	One day is not enough to prove long-term annual performance.
Monitoring Communication	Confirms data transfer from the inverter to the monitoring platform.	Internet failure does not always mean the solar system stopped generating.
Export-Control Check	Confirms the intended export or zero-export arrangement is being measured and controlled.	Final behaviour depends on meter, sensor and control configuration.

Commissioning Output Is Not an Annual Generation Guarantee: A successful startup confirms operation at that time. Long-term output still depends on sunlight, weather, shading, equipment condition, maintenance, grid availability and actual system design.

What Happens If a Defect Is Found During Commissioning?

If a test result is outside the expected range or a physical defect is identified, the affected circuit or system should remain isolated until the cause is found and corrected.

Possible Defect	Possible Cause	Typical Corrective Action
Reversed Polarity	Positive and negative DC conductors connected incorrectly	Isolate the circuit and correct the wiring before startup.
Low String Voltage	Missing module, open connector or incorrect string configuration	Inspect the string and compare it with the design.
Low Insulation Resistance	Damaged cable, moisture, connector issue or earth fault	Locate and repair the damaged or contaminated section.
Inverter Grid Fault	Grid voltage, frequency, wiring or settings outside limits	Check the supply, configuration and connection conditions.
No Monitoring Data	Internet, communication-device or account-setup issue	Restore communication and verify data transfer.
Unexpected Output Difference	Shading, string mismatch, faulty module or incorrect input allocation	Compare strings, layout, shading and inverter input data.
Loose Connection	Incomplete termination or incorrect tightening	Isolate, inspect and remake the connection correctly.
Roof or Mounting Defect	Broken tile, loose clamp, poor seal or incorrect support	Repair the roof or mounting before final handover.

Defects Should Be Recorded, Not Hidden: The customer should receive confirmation of significant defects, corrective work and any test that had to be repeated before final acceptance.

What Documents Should Be Provided After Commissioning?

The handover package should allow the owner to understand the installed system, operate it safely, access monitoring, request warranty support and provide records to future technicians or property buyers.

Final system layout
As-built single-line diagram
Panel schedule
Inverter schedule
Equipment serial numbers
Testing and commissioning report
Commissioning test readings
Completion certificate
Applicable electrical certificates
Protection-device information
Inverter settings record
Monitoring login details
Monitoring setup guide
Shutdown procedure
Restart procedure
Emergency-isolation instructions
Panel warranty
Inverter warranty
Mounting-system warranty
Workmanship warranty
Maintenance recommendation
Cleaning guidance
Service contact details
Fault-reporting procedure
Final installation photographs
Approval or meter records where applicable

Operating Instructions

The owner should know how to identify normal operation, warning indications and basic shutdown procedures.

Warranty Records

Product and workmanship warranties should identify the responsible company, coverage period and claim process.

Technical Drawings

Final drawings should represent the installed system rather than an outdated preliminary proposal.

Monitoring Access

The customer should receive working login access and know who to contact if data stops updating.

Keep the Handover Records for the Life of the System: These records may be useful for maintenance, warranty claims, insurance, roof work, inverter replacement, system expansion and property sale.

What Should the Customer Be Shown During Handover?

System Overview

Show the customer the panels, inverter, isolators, switchboard connection, meter and monitoring equipment.

Normal Operation

Explain normal inverter lights, monitoring status and expected daily changes in power production.

Shutdown Procedure

Explain the safe sequence for isolating the system when instructed or during an emergency.

Monitoring Access

Confirm that the customer can log in and view generation and system status.

Maintenance Expectations

Explain routine visual checks, cleaning considerations and when professional inspection may be needed.

Support and Warranty

Provide the correct contact for faults, monitoring issues, warranty claims and after-sales service.

The Customer Should Not Be Left with an Unexplained System: Handover should include practical operating guidance, working monitoring access and clear after-sales contact details.

What Testing and Commissioning Questions Should Be Asked Before Signing?

Who will perform the final testing and commissioning?
Will an appointed competent person be involved?
Which visual inspections are included?
Will every solar string be identified and tested?
Will DC polarity be tested?
Will open-circuit voltage be recorded?
Will insulation resistance be tested?
Will earthing continuity be checked?
Will the AC supply voltage and frequency be checked?
Will all isolators be tested?
Will surge-protection devices be inspected?
Will inverter grid settings be recorded?
Will anti-islanding operation be verified?
Will export-control settings be tested if applicable?
Will battery backup operation be tested if applicable?
Will the monitoring account be created for the customer?
Will customer monitoring access be tested before handover?
Will commissioning readings be provided in writing?
Will defects be recorded and corrected before handover?
Will the system be retested after corrective work?
Will final as-built drawings be provided?
Will serial numbers be included in the handover documents?
Will shutdown and restart procedures be explained?
Who should be contacted if the inverter shows a fault?
Who should be contacted if monitoring stops updating?
When is the system considered formally completed?
When do the workmanship and equipment warranties begin?

What Is Solar100’s Role in Testing and Commissioning Comparison?

Solar100

Supports solar-provider discovery
Helps customers organise initial project information
Supports initial quotation comparison
Helps identify differences in commissioning scope
Does not perform electrical testing
Does not issue commissioning certificates

Selected Provider and Technical Parties

Inspect the completed installation
Perform the required electrical tests
Configure and start the inverter
Correct defects before handover
Prepare commissioning and completion records
Remain responsible for the agreed project scope

Frequently Asked Questions

What is solar testing and commissioning?

It is the process of inspecting, testing, configuring and documenting a completed solar installation before final handover or activation.

Is commissioning the same as switching on the inverter?

No. Inverter startup is only one part of commissioning. The full process also includes physical inspection, electrical testing, protection checks, monitoring setup and documentation.

What is checked before a solar system is switched on?

The installer may check mounting, panels, cabling, connectors, isolators, polarity, voltage, insulation, earthing, protection devices, switchboard work and inverter settings.

Why is DC polarity testing important?

It confirms that positive and negative conductors are connected correctly before the inverter input is energised.

Why is insulation resistance tested?

It helps identify damaged insulation, moisture, connector problems or unintended leakage between live conductors and earth.

Will the installer test the monitoring system?

Monitoring setup should normally be checked during commissioning, including communication, live data, customer login and alarm status.

What happens if the inverter shows a fault during commissioning?

The installer should identify the cause, isolate the affected equipment where necessary, correct the problem and repeat the relevant tests.

Should I receive a commissioning report?

The customer should request written commissioning records, final drawings, equipment information, warranty documents and operating instructions.

Does successful commissioning guarantee annual solar generation?

No. It confirms that the system operated correctly during the commissioning process. Long-term generation still depends on sunlight, shading, weather, equipment condition, maintenance and grid availability.

Does Solar100 perform solar commissioning?

No. Solar100 supports provider discovery and initial quotation comparison. The selected provider and appointed technical parties remain responsible for testing, commissioning, certification and handover.

The information on this page is provided for general educational and comparison purposes. The required solar testing, inspection, commissioning, certification, protection checks, meter procedures and handover documents depend on the system design, equipment, property, connection arrangement, project capacity, electricity supply, applicable standards, authority requirements and contractual scope. Testing must be carried out by appropriately qualified, registered or competent parties using suitable procedures and calibrated equipment where required. Customers should obtain written confirmation of the testing scope, final results, certificates, defects, corrective work and handover records from the selected provider. Solar100 is a provider-discovery and quotation-comparison platform. It is not an installer, electrical contractor, engineer, competent person, equipment manufacturer, electricity utility, testing laboratory or approving authority and does not guarantee installation quality, test results, approval, system performance, annual generation, savings, warranty outcome or equipment service life.

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