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Publication No. US-RE-IOM-002 January 2012 Page 29
9.5 Operating
Temperature
Under normal operating conditions, the battery lifetime largely depends on the temperature and
depths of discharge. High temperature increases realized capacity but decreases life
expectancy, while low temperatures decrease capacity, but may not affect life expectancy. See
table below and chart below for expected life given by the two variables.
TABLE 9.3
DAILY DEPTH DISCHARGE @ C20
No.
of
Cycles 10% 20% 30% 40% 50% 60% 70% 80%
20
8891 4764 3164 2312 1852 1530 1319 1163
25
8717 4671 3102 2266 1816 1500 1293 1140
30
7514 4026 2674 1954 1566 1293 1115 983
35
6478 3471 2305 1684 1350 1115 961 848
40
5584 2992 1987 1452 1163 961 828 731
45
4814 2580 1713 1252 1003 828 714 630
Batteries for renewable energy applications
Derating factor for number of cycles vs. average cell temperature
Figure 9.2
Temperature in °C
Daily Weighted
Average
Temperature
