Per IEEE Standard 485, if the operating temperature of a battery (Lead Acid) is different from/ W9 u# J& V1 w4 j, M
that of the library curves used, the temperature correction factor should be applied in calculation " I$ X1 [$ r- {, R- F d# Iof battery capacity. Table 1 of the IEEE Standard 485 gives a list of correction factors for3 R! w9 f! W9 E) a
different operating temperature values, between –3.9 °C and 51.7 °C, assuming that the battery + }- C. O% H, _) b* Y$ Bcharacteristic curves are given at 25 °C. 7 A. N+ b9 R# o: x5 Netap Battery Sizing program determines the temperature correction factor according to this4 l# e: l% F" ?" f
table. $ k# U7 w4 V w4 _1 X! }1. If the battery characteristic curves used in the calculation are for 25 °C and the battery7 T' y, X# N" t) x; l
operating temperature is between –3.9 °C and 51.7 °C, the correction factor is determined& L2 m+ S; U" c" S1 E, Q
by the interpolation method based on the values given in table.) V4 z, P; F3 y% f& \0 L, M* Q
2. If the battery characteristic curves used in the calculation are for 25 °C, but the battery & q6 N% a0 ~/ D2 [/ R6 U G9 `operating temperature is outside the range from –3.9 °C and 51.7 °C, the correction factor ' w, G9 i* u0 c) _1 N$ l- u/ P3 jis determined by the following equation,) {: Y3 t/ e+ c/ e4 @9 a
y = -2.8117*x^3 + 4.1916*x^2 – 2.4941*x + 1.4054 K- Z$ T2 j; K) R$ A2 [, O4 H7 G
3. If the battery characteristic curves used in the calculation are not for 25 °C, the correction8 W3 v! k; R/ R# I: B8 J
factor given in Table 1 are shifted and then used as described in the above. For example, if 2 I2 e8 E; i% Q' Vthe battery characteristic curves are for 35 °C, the temperature values in Table 1 are f1 u1 x0 H$ a* Ymodified by adding 10 °C. Therefore, the correction factor at 35 °C is equal to 1 and the2 |( ]3 c( t' O6 P6 c3 b8 A
operating temperature range becomes 6.19 °C and 61.7 °C.