Eltek (eltek.com), a Norwegian power electronics company, received the UL1741 listing for its THEIA HE-t string inverter line. Its four UL models (2.0, 2.9, 3.8, and 4.4 kW) utilize NEMA 4X enclosures and include an integrated combiner box and DC disconnect. The inverters use a high-frequency transformer for high efficiency with galvanic isolation—the specification sheets list CEC efficiencies at 96.8% for the two smaller models and 97% for the two larger models. Unlike high-efficiency transformerless inverters, these units do not require the array to be ungrounded—thus disconnects and overcurrent protection are required only on one DC conductor (rather than both); and PV-wire module leads are not required. All models can be configured for 240 or 208 VAC output and can accommodate negative or positive array grounding. Each inverter includes an integrated Web server; installations using multiple inverters can designate a single inverter as a central monitoring hub.