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| 12.0 Specifications
Table 12: Battery Backup Times
Number of Batteries
Backup Time (minutes)
100% Load,
w
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Internal battery
82
46.5
33.5
22.5
17
13
11
9
7
6
4800
Internal b 1 external
battery cabinet
152
90.5
73
52.5
42.5
33.5
26.5
23
18
17
4800
Internal b 2 external
battery cabinets
220
131
104.5
81
65.5
52.5
46
39.5
34
27.5
4800
Internal b 3 external
battery cabinets
293.5
174.5
133
104.5
85.5
73
61
52.5
47
42.5
4800
Internal b 4 external
battery cabinets
367.5
210
161.5
128
104.5
87.5
78
68.5
59
52
4800
Using the configuration program, the user may specify the number of external battery cabinets attached to the UPS.
The factory default is programmed for internal batteries only. Table 12 shows the estimated battery backup times at
different loads.
12.1 Auto-learning Battery Backup Times
As batteries age, the estimated backup times may become less accurate. The S4K5U6K5C is programmed to “learn” from a
full battery discharge and then modify the estimated backup time for the measured battery capacity. This can improve
accuracy and compensate for aging batteries or batteries that operate at different ambient temperatures.
The UPS will update the anticipated backup time calculation only under certain conditions:
•
The UPS must have a steady load that is greater than 20%.
•
The UPS must be at 100% charge at the start of a battery discharge.
•
The battery discharge must continue uninterrupted until the batteries reach their end-of-discharge voltage.
if all conditions are not met, the backup time calculation will not be modified.
if the configuration program is used to change the number of battery cabinets, then the values in Table 12 will be
restored. This will override any value that is auto-learned.
