Power?

Figure average 250 watts for the system and 85 watts for the monitor if its lcd and 150 if its a Big CRT.

Thanks for that SpeedStep. Where did you get the figures from, are they generally availavble?

Hattersman

http://support.dell.com/support/systemsinfo/documentation.aspx?c=us&cs=19&l=en&s=dhs

http://support.dell.com/support/edocs/systems/opgx520/

http://support.dell.com/support/edocs/systems/opgx520/en/ug/index.htm

http://support.dell.com/support/edocs/systems/opgx520/en/ug/mtspecs0.htm#wp1133451

Power
 
DC power supply:
 
Wattage
 230 W
 
Heat dissipation
 150 W maximum
 
Voltage
 fixed-voltage power supply — 110 V at 50/60 Hz

manual selection and auto-sensing power supplies — 90 to 135 V at 50/60 Hz; 180 to 265 V at 50/60 Hz; 100 V at 50/60 Hz for Japanese computers
 
Backup battery
 3-V CR2032 lithium coin cell
 

Basic math 101

watts = volts X amps

At 120 volts it has a 3 amp inrush current and uses 2 amps continuous.

At 240 volts it has a 1 amp inrush current and uses .9 amps continoous.

Or something similar to that. There is no way to design for all spec. In Japan the voltage can go as low as 100v so the power supply fuse needs to be able to handle the inrush load without blowing.

Typical user is going to Need a 450VA unit or better.
I tend to use 1400VA units because the users also sometimes need a 60 watt lamp and radio and icecream maker and jacuzzi for their feet in order to operate the computer.