Juniper SRX5800 Hardware Manual page 193

2
For this configuration, output power is 4267 W.
3. Calculate input power. In this step, the input power requirements for the example configuration are
calculated. To do this, divide the total output requirement by the efficiency of the power supply as
shown in Table 52 on page
NOTE: Normal-capacity AC and DC power supplies are not included in the following
table, because their power budget was exceeded in the sample configuration.
Table 52: Calculating Input Power for SRX5800 Services Gateway with SCB3, IOC3, and RE2
Power Supply
SRX5800 AC high-capacity
SRX5800 DC high-capacity
1
These values are at full load and nominal voltage.
4. Calculate thermal output (BTUs) for the system. To calculate this value, add the total input power
requirement (in watts) for the two zones together and multiply the sum by 3.41 as shown in
Table 53 on page 194
Table 53: Calculating Thermal Output for SRX5800 Services Gateway with SCB3, IOC3, and RE2
Power Supply
SRX5800 AC high-capacity
SRX5800 DC high-capacity
194.
Power Supply
1
Efficiency
~88 %
86 %
.
Input Power Requirement
Zone 0: 4177/0.88= 4764 W
Zone 1: 4267/0.88= 4849 W
Zone 0: 4177/0.86= 4857 W
Zone 1: 4267/0.86= 4962 W
Thermal Output (BTUs per hour)
(4764 + 4849) * 3.41 = 32,780 BTU/hr
(4857 + 4962) * 3.41 = 33,482 BTU/hr
194