Table 48: Total Power Available With Efficiency - Juniper QFX10016 Hardware Manual

QFX10016 Switch Hardware Guide
118
In the previous examples, we calculated that a QFX10016 AC system would require
15700 W with five QFX10000-36Q and three QFX10000-30C line cards. In this
example, we calculate the total power available for this configuration:
= (15700 W) / (2700 W)
= 5.81
Round up the result to 6 AC power supplies. A base configuration would require an
additional power supply; a redundant AC system would have sufficient power supplies.
Calculate how much power the power supplies need. To determine the power required,
3.
multiply the number of power supplies by the power supply wattage and divide by
the efficiency of the power supply. The efficiency rate accounts for the loss of energy
within the power supply and is 89 percent for QFX10000 power supplies.
For example if you have an AC system with six power supplies:
= 6 (2700 W) / (efficiency rating)
= (16200 W) / (0.89)
= 18202 W
Table 48 on page 118 shows how much power needs to be supplied for various
configurations.

Table 48: Total Power Available with Efficiency

Number of Power Supplies
3
4
5
6
7
8
9
10 (for redundancy only)
AC
9102 W
12135 W
15169 W
18202 W
21236 W
24270 W
27304 W
Copyright © 2017, Juniper Networks, Inc.
DC
25281 W