Communication
27
Figure 15 Calculating total load per UPS
Note that the L1-N, L2-N and L1-L2 loads are evenly shared among all the connected UPSs. Load val-
ues are in kVA.
Table 3 Calculating total load, 20kVA example
20kVA Load, Full Load of Parallel Pod
2 UPSs Connected to Parallel POD 3 UPSs Connected to Parallel POD
UPS 1 UPS 2
Total Output
Load
UPS 1 UPS 2 UPS 3
Total Output
Load
L1-N L2-N L1-N L2-N L1-N L2-N L1-N L2-N L1-N L2-N
5 5 5 5 20 3.3 3.3 3.3 3.3 3.3 3.3 20
Total load supported by the parallel POD for each of these configurations is 20kVA. If two UPSs are connected to
the parallel POD, each provides 10kVA. If three UPSs are connected to the parallel POD, each provides 6.67kVA.
This example is the full load capacity of the parallel POD.
Table 4 Calculating total load, 12kVA example
12kVA Load, Full Load of Parallel Pod
2 UPSs Connected to Parallel POD 3 UPSs Connected to Parallel POD
UPS 1 UPS 2
Total Output
Load
UPS 1 UPS 2 UPS 3
Total Output
Load
L1-N L2-N L1-N L2-N L1-N L2-N L1-N L2-N L1-N L2-N
3333 12 222222 12
Total load supported by the parallel POD for each of these configurations is 12kVA. If two UPSs are connected to
the parallel POD, each provides 6kVA. If three UPSs are connected to the parallel POD, each provides 4kVA. This
example is with all 120V loads evenly distributed between L1-N and L2-N, or with 208/240V loads.
UPS 1 UPS 2
Total Output
Load
UPS 1 UPS 2 UPS 3
Total Output
Load
L1-N L2-N L1-N L2-N L1-N L2-N L1-N L2-N L1-N L2-N
2 4 2 4 12 1.33 2.67 1.33 2.67 1.33 2.67 12
Total load supported by the parallel POD for each of these configurations is 12kVA. If two UPSs are connected to
the parallel POD, each provides 6kVA. If three UPSs are connected to the parallel POD, each provides 4kVA. This
example is with more 120V loads connected on L2-N output.
UPS1 UPS2
Optional
Output
Distribution
Module
I/P I/P I/P O/PO/PO/P
Input
Output
Maintenance
Breaker
Load
L1
N
L2
G
L1
N
L2
G
L1
N
L2
G
L1
N
L2
G
UPS1 UPS2
Optional
Output
Distribution
Module
I/P I/P I/P O/PO/PO/P
Input
Output
Maintenance
Breaker
Load
L1
N
L2
G
L1
N
L2
G
L1
N
L2
G
L1
N
L2
G
UPS3
L1
N
L2
G
3 UPSes Connected
to a Parallel Pod
2 UPSes Connected
to a Parallel Pod
