Energy Storage Certification

Global energy storage testing, from cells to complete systems.

Home Energy Storage

Home Energy Storage

For residential solar storage, home backup power and time-of-use energy management Electrical Safety · EMC · System Protection, Performance & Reliability

Portable Energy Storage (Outdoor Power Stations)

Portable Energy Storage (Outdoor Power Stations)

For camping, mobile work and home emergency backup Electrical Safety · EMC · System Protection, Performance & Reliability

Integrated Solar and Storage Systems

Integrated Solar and Storage Systems

For solar generation, energy storage management and grid-connected or off-grid power Electrical Safety · EMC · System Protection, Performance & Reliability

EV Charging Stations

EV Charging Stations

For residential parking, public car parks and commercial charging stations Electrical Safety · EMC · System Protection, Performance & Reliability

UPS (Uninterruptible Power Supplies)

UPS (Uninterruptible Power Supplies)

For data centers, communications facilities and critical load backup Electrical Safety · EMC · System Protection, Performance & Reliability

Featured Certifications

Why Choose GTG

Over a decade of energy storage certification experience.

Over a Decade of Expertise

Over a Decade of Expertise

Over a decade of experience in energy storage certification, with in-depth knowledge of certification regulations and standards worldwide

Global Testing and Certification

Global Testing and Certification

Certification services covering over 130 countries and regions

Major Laboratories in South China

Major Laboratories in South China

Technical expertise and equipment investment focused on intelligent robots, with extensive testing capabilities

Trusted by Leading Companies

Trusted by Leading Companies

Our technical team has served over 1,000 intelligent robot manufacturers, building extensive practical experience

Dedicated Support

Dedicated Support

One-to-one guidance throughout your project.

Laboratories

40,000 m² of laboratories and 2,000+ testing instruments.

Our Clients

Trusted by leading brands.

MTC
COSMX
LEDVANCE
TP-LINK
CUPower
Hank Electronics
HKC
UTL
Up-shine Lighting
CE-LINK
BBK
Megmeet
KTC
Ganfeng Lithium

Service Process

Expert support from testing to report delivery.

01

Online Consultation

Discuss your requirements
Assess feasibility

02

Quotation

Provide a competitive quote
Sign the contract

03

Sample Assessment

Develop a certification plan
Assess feasibility

04

Test Report

Test sample data
Issue the report

05

Certificate Management

Regulatory and standards updates
Expiry reminders

06

Lifetime Support

Regular customer follow-up
Ongoing support

News

More News
2026-09-11

Must Both Grid-Connected and Off-Grid Modes Be Tested?

Provide all declared operating modes and switching conditions. The test plan should select representative states accordingly to avoid overlooking safety risks under different directions of energy flow.

2026-09-11

Can an Inverter Certificate Still Be Used After Adding an Internal Battery?

Integration changes electrical, thermal and control conditions. Check the original certificate’s scope and assess the added battery, charge and discharge paths and overall protection coordination.

2026-09-11

Is Additional Testing Needed If the Cells Change but Capacity Stays the Same?

Cell internal resistance, protection characteristics, temperature limits and existing reports may differ. Submit the new cell information and assess battery pack and complete-product differences. Capacity alone cannot establish equivalence.

2026-09-11

Can a Portable Power Station Be Marketed Directly as a UPS?

If uninterrupted power or a specific transfer time is claimed, define applicable loads and performance limits and verify those functions accordingly. Having a backup-power mode does not mean all UPS assessments have been completed.

2026-09-11

Is Environmental Testing Still Needed on a Sheltered Balcony?

Select tests according to the environment specified in the operating instructions. Condensation, temperature changes, sunlight, humidity and possible rain exposure may still affect connector and enclosure protection.

2026-09-11

Does a CE Assessment Allow Grid Connection in Every Region?

Product compliance and local grid connection are separate matters. Check grid parameters, installation and other applicable requirements against the sales country and actual connection conditions.

2026-09-11

Can a Balcony Battery Be Used with Any Microinverter?

Check input and output voltages, currents, communications protocols, power limits and fault responses. Changes to the compatible equipment list require assessment of electrical compatibility and complete-product differences.

2026-09-11

Is an Auxiliary Vehicle Power Supply Classified as a Traction Battery?

Distinguish them according to actual use. Auxiliary storage supplying living or work equipment differs in function and assessment route from a traction battery that drives a vehicle.

2026-09-11

Are Mobile Energy Storage Systems and Portable Power Stations Tested in the Same Way?

Classification depends on capacity, weight, handling method, output interfaces and intended use. Mechanical securing and power distribution risks in trailer-mounted or large mobile equipment cannot be assessed simply as those of a handheld outdoor power station.

2026-09-11

Does Adding Battery Modules Affect the Original Assessment?

Changes in module quantity may affect voltage, short-circuit current, heat dissipation and system control. Define the maximum expansion range in advance and assess representative configurations and tests for the differences.

2026-09-11

What Is the Difference Between UL 9540 and UL 9540A?

UL 9540 covers energy storage system and equipment safety. UL 9540A is a test method for evaluating thermal runaway fire propagation in battery energy storage systems. They serve different purposes; the required assessment levels and test configurations depend on the project.

2026-09-11

If the Battery Already Has a Report, Must the Complete Home Storage System Still Be Tested?

A battery report can support the assessment but cannot replace complete-system evaluation. Check the voltage, current, communications protocol and coordinated protection of the battery and inverter, and verify the final installation configuration.

2026-09-11

Must Both Grid-Connected and Off-Grid Modes Be Tested?

Provide all declared operating modes and switching conditions. The test plan should select representative states accordingly to avoid overlooking safety risks under different directions of energy flow.

2026-09-11

Can an Inverter Certificate Still Be Used After Adding an Internal Battery?

Integration changes electrical, thermal and control conditions. Check the original certificate’s scope and assess the added battery, charge and discharge paths and overall protection coordination.

2026-09-11

Is Additional Testing Needed If the Cells Change but Capacity Stays the Same?

Cell internal resistance, protection characteristics, temperature limits and existing reports may differ. Submit the new cell information and assess battery pack and complete-product differences. Capacity alone cannot establish equivalence.

2026-09-11

Can a Portable Power Station Be Marketed Directly as a UPS?

If uninterrupted power or a specific transfer time is claimed, define applicable loads and performance limits and verify those functions accordingly. Having a backup-power mode does not mean all UPS assessments have been completed.

2026-09-11

Is Environmental Testing Still Needed on a Sheltered Balcony?

Select tests according to the environment specified in the operating instructions. Condensation, temperature changes, sunlight, humidity and possible rain exposure may still affect connector and enclosure protection.

2026-09-11

Does a CE Assessment Allow Grid Connection in Every Region?

Product compliance and local grid connection are separate matters. Check grid parameters, installation and other applicable requirements against the sales country and actual connection conditions.

2026-09-11

Can a Balcony Battery Be Used with Any Microinverter?

Check input and output voltages, currents, communications protocols, power limits and fault responses. Changes to the compatible equipment list require assessment of electrical compatibility and complete-product differences.

2026-09-11

Is an Auxiliary Vehicle Power Supply Classified as a Traction Battery?

Distinguish them according to actual use. Auxiliary storage supplying living or work equipment differs in function and assessment route from a traction battery that drives a vehicle.

2026-09-11

Are Mobile Energy Storage Systems and Portable Power Stations Tested in the Same Way?

Classification depends on capacity, weight, handling method, output interfaces and intended use. Mechanical securing and power distribution risks in trailer-mounted or large mobile equipment cannot be assessed simply as those of a handheld outdoor power station.

2026-09-11

Does Adding Battery Modules Affect the Original Assessment?

Changes in module quantity may affect voltage, short-circuit current, heat dissipation and system control. Define the maximum expansion range in advance and assess representative configurations and tests for the differences.

2026-09-11

What Is the Difference Between UL 9540 and UL 9540A?

UL 9540 covers energy storage system and equipment safety. UL 9540A is a test method for evaluating thermal runaway fire propagation in battery energy storage systems. They serve different purposes; the required assessment levels and test configurations depend on the project.

2026-09-11

If the Battery Already Has a Report, Must the Complete Home Storage System Still Be Tested?

A battery report can support the assessment but cannot replace complete-system evaluation. Check the voltage, current, communications protocol and coordinated protection of the battery and inverter, and verify the final installation configuration.

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