This Controlled Ferroresonant transistor switching inverter design converts DC power into AC power.
This IX Inverter Series pre-configured inverter system include a Controller, static Transfer Switch, Power Distribution and Maintenance Bypass Switch. 
The Manual Bypass Switch (MBS) provides a mechanical means to transfer between power sources to your critical loads.
The La Marche LTI 2 inverter is the ideal choice if the AC power requirement are critical. This inverter is equipped with standard features such as sine wave output, voltage regulation, under/over–voltage conditions, and overload protection.