GEAR: ABB UNO Smart Inverters


ABB ( released its UNO-DM-PLUS-US residential PV inverter line, which is listed to UL1741-SA to comply with California’s Rule 21 and Hawaii’s Rule 14 for smart inverters. These batteryless grid-tied inverters offer dual MPPT inputs and are available in five capacities from 3.3 to 6.0 kW. Highlights include wireless communication via an integrated web server and a load manager, which is helpful for homes with smart appliances and systems designed to maximize PV energy self-consumption. Their CEC efficiency ranges from 96.5% to 97% at 240 VAC output. A NEMA 4X enclosure allows outdoor installation. These units can be installed with ABB’s string-level rapid shutdown unit to comply with the 2014 NEC Article 690.12 requirements or with Tigo’s TS4 optimizers, which meet 2017 requirements.

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