UL 1741 SA is a product safety standard that establishes manufacturing and testing requirements. UL 1741 SA is officially called "UL 1741: Standard for Inverters, Converters, Controllers and Interconnection System Equipment for Use with Distributed Energy Resources." SA is short for Supplement A, an addition to the existing UL 1741 standard designed to create a standard for inverters more capable of dealing with a volatile grid and "future-proofing" by creating a standard for inverters to actively manage grid functions. Products that meet this requirement are known as "Grid Support Inverters," "Smart Inverters," or "Advanced Inverters."