Samlex Solar SCC-30AB, Owner'S Manual, Page: 46 / 53

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6
InstallatIon & operatIon
The Battery Temperature Sensor (BTS) corrects the Absorption, Equalization & Float
Voltage by the following values (reference temperature is 25ºC / 77ºF):
• 12V battery: –0.030V per °C (–0.017V per °F).
• 24V battery: –0.060V per °C (–0.033V per °F).
The temperature sensed by the BTS at the battery is displayed on the LCD screen
under the screen display “Heatsink BTS” (see Screen 7, Fig. 5.3).
As the LCD display is not
capable of displaying negative values, battery temperature below 0ºC will not be displayed. If the
battery temperature falls below 0ºC, 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 Absorption, Equalization and Float Set Points by 0.90V in a 24V system and
0.45V in a 12V system.
Typical compensation is given in Table 6.2 below:
BATTERy ELECTROLyTE
TEMPERATURE
VOLTAGE COMPENSATION
12V BATTERy 24V BATTERy
50ºC / 122ºF – 0.75V –1.50V
45ºC / 113ºF – 0.60V – 1.20V
40ºC / 104ºF – 0.45V – 0.90V
35ºC / 95ºF – 0.30V – 0.60V
30ºC / 86ºF – 0.15V – 0.30V
25ºC / 77ºF (Reference) 0V (Reference) 0V (Reference)
20ºC / 68ºF + 0.15V + 0.30V
15ºC / 59ºF + 0.30V + 0.60V
10ºC / 50ºF + 0.45V + 0.90V
5ºC / 41ºF + 0.60V + 1.20V
0ºC / 32ºF
+ 0.75V + 1.50V
Table 6.2. Temperature Compensation