UL 3700 Testing and Certification for Plug-in Photovoltaic (PIPV) Equipment

UL 3700 is the Outline of Investigation for Interactive Plug-in Photovoltaic Equipment and Systems. Developed to support the growing plug-in solar market, it establishes safety requirements for equipment that generates electricity and connects through a dedicated plug-in photovoltaic receptacle.

Unlike conventional rooftop photovoltaic systems that require permanent wiring, permits, and professional installation, products evaluated to UL 3700 are intended to simplify installation while maintaining electrical safety and compatibility with the building electrical system.

The outline applies to equipment including:

• Plug-in photovoltaic (PIPV) systems
• Balcony solar systems
• Plug-in PV modules
• AC photovoltaic modules
• Microinverter-based plug-in systems
• Integrated energy storage systems (ESS) used within PIPV equipment
• Associated power electronics
• Mounting systems covered by the outline

Intertek provides testing and certification for a broad range of products supporting plug-in solar applications, including:

Our engineers can also evaluate integrated products where plug-in PV functionality is combined with another certified end product.

UL 3700 evaluates the safety of plug-in photovoltaic equipment through construction reviews, electrical safety evaluations, and performance testing. Depending on the product configuration, testing may incorporate requirements from additional standards such as UL 1741, UL 61730, and UL 2703.

Key evaluation areas include:

UL 3700 Construction Review

Intertek evaluates product construction to verify compliance with UL 3700 requirements, including:

• Bonding and grounding
• Field wiring connections
• Electrical spacing and insulation
• Branch circuit overcurrent protection
• Class A bidirectional GFCI protection
• Connector ratings for voltage and current
• Component compliance with applicable product standards

For products that integrate plug-in PV functionality into another product, applicable end-product requirements are also evaluated.

UL 3700 Testing

Testing may include:

• Electrical safety testing
• Mechanical load testing
• Stability testing
• Impact testing
• Point load testing
• Temperature testing
• Leakage current testing
• Folding and cord flex testing
• PV module performance evaluations
• Mounting system evaluations

Testing requirements vary depending on whether the equipment incorporates Class 2 PV power sources and whether the product is integrated into another certified system.

Marking and Documentation Review

Manufacturers must provide permanent markings and comprehensive documentation supporting safe installation and operation.

Intertek reviews:

• Product markings
• Safety labels
• Installation instructions
• Operating instructions
• Maintenance information
• Storage and transportation instructions
• Fire and electrical shock warnings
• Instructions for qualified installers where applicable

Because plug-in photovoltaic systems often combine multiple technologies, compliance frequently involves evaluation to several industry standards.

Depending on product design, Intertek can evaluate products against:

• UL 1741 - Inverters, Converters, Controllers and Interconnection System Equipment
• UL 61730 - Photovoltaic (PV) Module Safety Qualification
• UL 2703 - Mounting Systems, Mounting Devices, Clamping/Retention Devices and Ground Lugs for Flat-Plate Photovoltaic Modules and Panels
• UL 9540 - Energy Storage Systems and Equipment
• UL 9540A - Test Method for Evaluating Thermal Runaway Fire Propagation in Battery Energy Storage Systems (when applicable)

Our engineers help determine which standards apply to your product and develop an efficient compliance strategy.

Intertek provides comprehensive testing and certification services across the renewable energy ecosystem, helping manufacturers streamline product development and market entry.

Our capabilities include:

• UL 3700 testing and certification
• ETL Certification
• Product safety engineering
• Electrical performance testing
• PV module testing
• Energy storage system testing
• Inverter certification
• North American market access
• Global regulatory support

With extensive experience evaluating photovoltaic equipment, energy storage systems, power electronics, and connected electrical products, Intertek helps manufacturers navigate evolving safety requirements with confidence.