Per IEEE Standard 485, if the operating temperature of a battery (Lead Acid) is different from- ^& B! t k- ?; w+ Y
that of the library curves used, the temperature correction factor should be applied in calculation3 t. d# w- D! H* x: y
of battery capacity. Table 1 of the IEEE Standard 485 gives a list of correction factors for ) {: _$ |7 a: S7 w# V) S. v$ A( Udifferent operating temperature values, between –3.9 °C and 51.7 °C, assuming that the battery8 O8 |* J x1 A7 V) n# w: B
characteristic curves are given at 25 °C.% [7 c/ J9 S7 B1 k etap Battery Sizing program determines the temperature correction factor according to this 5 _" j7 C1 u) ` j g2 ]4 r: D) ttable.2 @7 L' b ~: \+ i9 H
1. If the battery characteristic curves used in the calculation are for 25 °C and the battery ) G- C* b3 j& X5 Foperating temperature is between –3.9 °C and 51.7 °C, the correction factor is determined9 _, j7 I) ]+ \
by the interpolation method based on the values given in table.; L% E4 G: M& |3 i; X- b9 R+ j
2. If the battery characteristic curves used in the calculation are for 25 °C, but the battery : y8 \4 k+ x6 y+ \0 _1 i7 Zoperating temperature is outside the range from –3.9 °C and 51.7 °C, the correction factor c: n0 T! r5 k0 K! |3 a1 M7 Uis determined by the following equation,6 M! g4 W/ q. ^! a3 o; G3 r6 ^
y = -2.8117*x^3 + 4.1916*x^2 – 2.4941*x + 1.405; A6 l+ } a4 E' h
3. If the battery characteristic curves used in the calculation are not for 25 °C, the correction# ]! ^7 K+ K. k! ~) l3 M5 _3 n, x
factor given in Table 1 are shifted and then used as described in the above. For example, if ' n; k+ M4 F, m% pthe battery characteristic curves are for 35 °C, the temperature values in Table 1 are 4 K' x" U0 j% `modified by adding 10 °C. Therefore, the correction factor at 35 °C is equal to 1 and the ) P1 A9 ]: k. M) Goperating temperature range becomes 6.19 °C and 61.7 °C.