Recorded Webinar: Advanced Inverters UL 1741 SA (Free)


Modernizing the world’s electric grids is a critical enabler for achieving the societal benefits and avoiding brownouts or blackouts that come from optimizing the way we generate, distribute and use electricity. If implemented properly, distributed generation with advanced functionality and communications capability may even increase the reliability and stability of the grid.

UL continues to forge new paths on grid interconnection safety standards to keep pace with new power production applications, new product opportunities and new customer needs. We are also working closely with the state of California — the state at the forefront of incorporating distributed generation into its energy system — to draft UL 1741 SA (Supplement A) specifications for Grid Support Utility Interactive Inverters.

Advanced inverter testing is smart, reactive control of distributed generation (DG) for support of ongoing modernization of grids utilizing increasing levels of DG and renewable energy resources. Traditional utility interconnection requirements (IEEE 1547) require DG devices to disconnect when the grid is experiencing stability issues. The UL 1741 SA specifies the test methods needed to build the foundation for DG devices to stay online and adapt their output and overall behavior to stabilize the grid during abnormal operation rather than simply disconnecting.

The Rule 21 tariff is the inverter related revisions to the State of California Electric Tariff Rule 21 made by the California Public Utility Commission (CPUC). Rule 21 is a Source Requirement Document (SRD) to be used with the UL 1741 SA. SRDs set the specific parameter settings to be used with the test methods of the UL 1741 SA. Other SRDs may also be used with the UL 1741 SA as other markets look to build smart grid functionality into the modernization of their local area electrical power system.

The state of California has announced that inverters installed in the state will be required to comply with the Rule 21 tariff within one year of the publication (expected second half of 2016) of the UL 1741 SA. Other states are considering adopting similar installation requirements especially in areas containing high levels of DG and solar penetration. In this free webinar, find out what is involved, expected, and benefits of getting UL 1741 SA certification now to streamline your product access and be prepared for these new requirements.


Upon completion of this webinar participants will be able to:

  • What the supplement in UL 1741 SA covers and why was it needed
  • What are the requirements and functions covered in the UL 1741 SA.
  • Describe the UL 1741 SA covered products
  • The importance of certifying now for product access
  • Overview of required and optional tests
  • Overview of Rule 21 and how source requirement documents (SRDs) are utilized

Target Audience

  • Product Safety Engineers
  • Compliance Engineers
  • Product Designers
  • Energy storage system manufacturers
  • Energy storage system installers and integrators
  • Renewable energy system manufacturers and integrators
  • Utilities and electrical energy service providers
  • Authorities having jurisdiction and regulators
  • Utility and infrastructure insurance entities

About the Instructors

Tim Zgonena
Principal Engineer
Distributed Energy Resources Equipment and Systems

Tim has worked for UL since 1990 as Principal Engineer for Distributed Energy Resources Equipment and Systems. His responsibilities include the development, maintenance and application of UL's certification requirements and delivery of UL conformity assessment services for: utility grid interconnection systems equipment, inverters and converters, PV BOS equipment, engine generators, wind turbines and wind turbine system components. Tim serves on several Distributed Generation IEEE, IEC and AWEA Technical Committees and he is a member of NFPA 70, NEC Code Making Panel 4, and is a 2012 IEC 1906 Award Recipient.


Scott Picco
Business Development Manager & Regional Lead Reviewer
Distributed Energy Resources Equipment and Systems


Scott Picco has worked for UL since 2005 and is currently Business Development Manager & Regional Lead Reviewer for Distributed Energy Resources Equipment and Systems. His responsibilities include business development for new programs and service offerings in UL’s Energy Systems & E-Mobility Segment within the Energy & Power Technologies division (E&PT), managing large power conversion equipment certification projects globally, and he serves as the technical sales lead for inverters and other solar equipment within UL’s E&PT Division. Scott’s experience at UL also includes establishing UL’s 100 kW inverter lab at UL’s office in Neu-Isenburg, Germany as well as training the UL German inverter engineering staff. Additionally, he started his career at UL as an engineer in the conformity assessment services department conducting certification investigations for inverters and other distributed generation equipment, PV modules, and energy storage systems.


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Time Requirement


Pre-Recorded Webinar 60 minutes

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