The Mesa Series is a single phase, online, solid-state inverter system designed to provide "soft-start" power to designated emergency lighting fixtures. Each system consists of a self-contained inverter section with a fully automatic, thermal-compensating, variable-rate battery charger. The Mesa series is designed to function in conjunction with the existing building electrical system to provide Pulse Width Modulated (PWM), sinusoidal, high-quality power conditioning, back-up power protection and distribution for lighting loads and other critical loads. Upon failure of the normal utility power, the Mesa Series automatically transfers to inverter mode and provides a minimum of 90 minutes of emergency power to the connected load. Lumen output will be maintained at 100% of the lamp's rating throughout the duration.