The Rotoverter from Ronk Electrical Industries is designed to operate pump motor loads that may vary considerably. Its tapped winding allows the pump motor currents to be balanced for maximum motor life. Units include automatic starting with HOA switch. The LS version is furnished in a pad-mount fiberglass enclosure with louvers, heat exhaust fan and locking provisions. Designed for use on duplex sewage pump stations and duplex water booster stations, the units are sized to run 2 to 40 hp motors to handle most lift station applications where three-phase power is needed and only single-phase power is available. 800/221-7665; www.ronkelectrical.com.