Eltek (eltek.com) was established in 1971 and is headquartered in Drammen, Norway, with its U.S. regional office in Plano, Texas. Eltek is an international power electronics supplier to the telecom, rail, power generation and distribution, solar, and electric vehicle industries.
The Eltek THEIA HE-t UL series inverters are transformer-based and range in capacity from 2 to 4.4 kW. The 2 and 2.9 kW models have a CEC-rated efficiency of 96.5%, and the 3.8 and 4.4 kW models are listed at 97% at 240 VAC.
Fronius (fronius-usa.com) was founded in 1945 and is headquartered in Pettenbach, Austria. Fronius has three divisions supplying battery-charging systems, welding technology, and solar electronics. Its U.S. subsidiary headquarters is in Portage, Indiana.
The Fronius inverters are transformer-based in three models: the IG Plus V, the IG Plus Advanced, and its newest addition—the Galvo inverter (see “Gear” in HP159). The IG Plus V line has seven options ranging from 3 to 11.4 kW, with CEC-rated efficiencies between 95.5% and 96% at 240 VAC output. The IG Plus Advanced line has the same capacity options and CEC efficiencies as the IG Plus V, but includes arc-fault protection. The Galvo models are smaller-capacity inverters in four options ranging from 1.5 to 3.1 kW and include arc-fault protection.
Ingeteam (ingeteam.com) was founded in 1972, with headquarters in Bilbao, Spain. Ingeteam specializes in electrical equipment and services for industry, marine, railway, and energy markets, with a focus on power components for wind and PV systems. Ingeteam includes a manufacturing facility in Milwaukee, Wisconsin, and a sales office in Santa Clara, California. Its U.S. product line includes PV grid-tied inverters and large-scale (100+ kW) battery-based inverter systems.
Ingeteam’s residential inverters include the transformer-based Ingecon Sun Lite 5 U, a 5 kW unit with a 95.5% CEC efficiency, and five transformerless Sun Lite TL U models, which range in capacity from 3.6 to 8.6 kW, and have CEC efficiencies from 96 to 97% at 240 VAC output.
KACO New Energy (kaconewenergy.com) celebrates its 100th anniversary this year. Headquartered in Neckarsulm, Germany, it was originally an automotive industry supplier. KACO has been designing and manufacturing power electronics for more than 60 years and provides power supplies for rail and industrial applications, custom fuel cell inverters, and combined heat and power plants. KACO’s U.S. headquarters is in Grass Valley, California, and has a new manufacturing facility in San Antonio, Texas.
Transformer-based residential string inverters from KACO range from 1.5 to 5 kW, with CEC efficiencies of 95% to 95.5%. Its transformerless models are available in 6.4 and 7.6 kW capacities and have a listed CEC efficiency of 96.5%. The “M” models have Tigo Energy’s Maximizer Management Unit pre-installed (see “Gear” in HP154).
Power-One (power-one.com) is headquartered in Camarillo, California, and also has facilities in China, Italy, and Slovakia. In July 2013, the multinational ABB Group, which provides power and automation technologies, acquired Power-One.
Power-One’s residential PV string inverters include transformer-based UNO 2.0 and 2.5 kW models, which have CEC efficiencies of 95.5% and 96%, respectively. There are five transformerless PVI models ranging from 3.0 to 6.0 kW, all of which offer dual MPPT inputs and 96 to 96.5% CEC efficiency. All of the Power-One string inverters have a NEMA 4X rating.