A voltage optimizer is a device designed to reduce the variations in voltage of the supply to some other apparatus. Electromechanical regulators called voltage optimizer or tap-changers, have also been used to regulate the voltage on AC power distribution lines.

These regulators operate by using a servomechanism to select the appropriate tap on an autotransformer with multiple taps, or by moving the wiper on a continuously variable auto transfomer. Mexter SunOasis has done careful research and product trials on a number of voltage optimizer and is in the midst of including this technology as part of our lineup.