Fronius inverters certified for Rule 21 requirements

By Kathie Zipp Fronius USA recently received UL certification for California’s Rule 21 inverter requirements, which are required in California for new Net Energy Metering (NEM) applications from September 8th. Once again, Fronius is a strong driving force when it comes to smart grid integration of inverters and is among the first string inverter manufacturers to receive certification.
Rule 21 refers to the generator interconnection requirements of each California Investor-Owned Utility (IOU). A years-long process has been underway to update Rule 21 with “smart inverter” requirements. Rule 21 requires inverters to have new grid support functions and a new certification under UL 1741 SA.

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