Site preparation guide HP Z800 Workstation 1110 W power supply HP Z820 Workstation 1125 W power supply HP Z840 Workstation 1125 W power supply

Input current calculation
The 1110W power supply can provide 1110 watts in a 15A circuit by using this input current
calculation:
Input Current = Output Power / (Voltage x Power Factor x Efficiency)
Workstation HP Z800 HP Z820 HP Z840
Output Power = 1110 watts 1125 watts 1125 watts
Voltage = 90 volts 90 volts 90 volts
Power Factor = 0.998 0.998 0.998
Efficiency = 0.820 0.835 0.835
In this formula, the voltage (90 volts) includes all power line variations—line voltage
sag, brownout conditions, power grid characteristics, and so on.
CAUTION: Check with your power provider to see if your facility is exposed to 90V power. If 90 volts
cannot be guaranteed to your workstation, the input voltage source might blow the fuse in the power
supply or trip the breaker.
For reliable workstation operation under heavy loading, use a UPS because it provides reliable
voltage levels.
4 Power consumption and cooling