Built in 1995 as a backup power supply for large computer systems. Currently does not provide enough power for large computer systems but provides too much power for small single systems. Requires a separate 12VDC car battery capable of outputting 50Amps. Useable as a standard 120VAC 60Hzpower source for auto or boat. provides 4 standard output plugs on rear panel. fused at 4 Amps. Recharges battery when plugged into a standard 120VAC power outlet. Input 12VDC 50Amps Battery. Output 120VAC 60Hz 4 Amps. (standard line). Power 500Watts. Equivalent to a small gas generator. Enough power to power your high power hand drill, buffer, sander, soldering iron, and a 100W light bulb all at the same time from the hood of your car or in your boat!