Per IEEE Standard 485, if the operating temperature of a battery (Lead Acid) is different from 2 @8 O2 _% ~8 q4 n+ L1 a2 mthat of the library curves used, the temperature correction factor should be applied in calculation& }6 h9 ~( U' g
of battery capacity. Table 1 of the IEEE Standard 485 gives a list of correction factors for 6 O/ x) Q/ [# l8 H1 {2 e Zdifferent operating temperature values, between –3.9 °C and 51.7 °C, assuming that the battery) X/ U/ g9 ]% h) N
characteristic curves are given at 25 °C. $ l& _* ^0 u- q$ n5 e# tetap Battery Sizing program determines the temperature correction factor according to this- T8 F. Y3 r' D W) m
table.1 {7 r9 l; y4 v& @
1. If the battery characteristic curves used in the calculation are for 25 °C and the battery8 ^" }9 O2 C2 ]$ |: A! w
operating temperature is between –3.9 °C and 51.7 °C, the correction factor is determined * h4 }7 \, r2 ~- nby the interpolation method based on the values given in table.; k0 ]" C- o" A l) x+ i2 B1 P( Z
2. If the battery characteristic curves used in the calculation are for 25 °C, but the battery' d+ U, a0 M5 J! d& J+ t
operating temperature is outside the range from –3.9 °C and 51.7 °C, the correction factor8 @; \) u0 W' M
is determined by the following equation, 0 q9 w& ^+ ]0 ~7 z0 i% [/ [y = -2.8117*x^3 + 4.1916*x^2 – 2.4941*x + 1.405% } R/ Z% O3 Z, X% X- T
3. If the battery characteristic curves used in the calculation are not for 25 °C, the correction 0 R% N& C5 K' N, Kfactor given in Table 1 are shifted and then used as described in the above. For example, if $ Z' Z; u& P; `1 Z, l0 j; U# O6 xthe battery characteristic curves are for 35 °C, the temperature values in Table 1 are + v' o% @4 x/ h! h/ ?- I smodified by adding 10 °C. Therefore, the correction factor at 35 °C is equal to 1 and the % f! `0 X. t) \# T$ \6 Toperating temperature range becomes 6.19 °C and 61.7 °C.