Per IEEE Standard 485, if the operating temperature of a battery (Lead Acid) is different from8 l) N* {" K9 O j# @+ J
that of the library curves used, the temperature correction factor should be applied in calculation & w2 ]* d9 C: f$ W; \7 z8 pof battery capacity. Table 1 of the IEEE Standard 485 gives a list of correction factors for 8 _, |1 C1 n& J4 b4 A0 Ndifferent operating temperature values, between –3.9 °C and 51.7 °C, assuming that the battery {' T4 L c, F! ~" s: c
characteristic curves are given at 25 °C.0 w5 A/ r1 W) n h5 J) J6 ] etap Battery Sizing program determines the temperature correction factor according to this) [$ l, Q+ g5 i9 ? `& P6 Y
table. ' Q: q5 l9 u0 [+ d1. If the battery characteristic curves used in the calculation are for 25 °C and the battery 0 t; N9 e |- B9 ?! t! Eoperating temperature is between –3.9 °C and 51.7 °C, the correction factor is determined6 a9 ]: U/ `: V
by the interpolation method based on the values given in table. * x1 z* y/ ]- i( C/ {2. If the battery characteristic curves used in the calculation are for 25 °C, but the battery4 ?! j. s; ]9 ?, l5 C* ?/ m
operating temperature is outside the range from –3.9 °C and 51.7 °C, the correction factor / ~% e* e1 ~" Z/ u/ ?is determined by the following equation,1 {. v) j4 ^; R3 E
y = -2.8117*x^3 + 4.1916*x^2 – 2.4941*x + 1.405/ y. N' u5 l6 }4 f. d
3. If the battery characteristic curves used in the calculation are not for 25 °C, the correction: n! G: Z6 @- M+ F6 a- M
factor given in Table 1 are shifted and then used as described in the above. For example, if- J+ ~; G5 s6 b. G/ e$ t7 |$ o/ v
the battery characteristic curves are for 35 °C, the temperature values in Table 1 are6 R( m+ w Q% a+ c: q3 `9 E7 Q. z: N
modified by adding 10 °C. Therefore, the correction factor at 35 °C is equal to 1 and the: i- c$ d% U" a
operating temperature range becomes 6.19 °C and 61.7 °C.