Power is only being converted once (AC to DC, or DC to AC). In normal operation, a small amount of power is being converted from AC to DC to maintain battery charge. When input AC power goes out of specification, the inverter converts the DC power to AC to support the load. When the input power goes out of specification, there is a power disturbance in output voltage as the power failure is detected, the transfer relay operates, and the output inverter turns on to begin supplying the load.

Product (click below to download PDF file) Sola 520 Rackmount single Sola 520 single