44
6
InstallatIon & operatIon
The temperature sensed by the BTS at the battery is displayed on the LCD screen
under the screen display “Heatsink BTS” (see Fig. 5.3). As the LCD display is not
capable of displaying negative values, battery temperature below 0 ºC will not be
displayed. If the battery temperature falls below 0 ºC, the display will read --- ºC
and temperature compensation is disabled.
Variations in battery electrolyte temperature can affect charging, battery capacity,
and battery life. The greater the range of battery temperatures, the greater the
impact on the battery. For example, if the battery temperature falls to 10°C (50°F),
this 15°C (27°F) change in temperature with respective to the reference of 25°C / 77°F
will change the PWM Absorption, equalization and oat set points by 0.90 V in a 24 V
system and 0.45 V in a 12 V system.
Typical compensation is given in Table 6.2 below:
BATTERY ELECTROLYTE
TEMPERATURE
VOLTAGE COMPENSATION
12 VOLT BATTERY 24 VOLT BATTERY
50 ºC / 122 ºF
– 0.75 V –1.50 V
45 ºC / 113 ºF – 0.60 V – 1.20 V
40 ºC / 104 ºF – 0.45 V – 0.90 V
35 ºC / 95 ºF – 0.30 V – 0.60 V
30 ºC / 86 ºF – 0.15 V – 0.30 V
25 ºC / 77 ºF (Reference) 0 V (Reference) 0 V (Reference)
20 ºC / 68 ºF + 0.15 V + 0.30 V
15 ºC / 59 ºF + 0.30 V + 0.60 V
10 ºC / 50 ºF + 0.45 V + 0.90 V
5 ºC / 41 ºF + 0.60 V + 1.20 V
0 ºC / 32 ºF + 0.75 V + 1.50 V
Table 6.2. Temperature Compensation
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