Xantrex Technology C40 - Manual (Page 56)

Installation
36 975-0004-01-02 Rev D
If using a BTS, when the battery temperature drops below
77°F (25 °C), the regulation voltage setting automatically
increases. When the temperature rises above 77°F (25 °C) the
regulation battery voltage setting automatically decreases.
Manual Battery Temperature Compensation
If no Battery Temperature Sensor (BTS) is installed and the
batteries will be operating in very hot or very cold conditions,
adjust the bulk and float settings to allow for the battery
temperature.
The recommended adjustments can be made following Table
2-2 . The setting should be lowered for ambient temperatures
above 86 °F (30 °C) and raised for ambient temperature
below 68 °F (20 °C).
If significant seasonal variations are common, you will have
to change the settings several times a year to prevent battery
damage and ensure proper operation.
Important: If the wiring to the sensor is damaged and the
wires are shorted or cut, the system will return to the
non-temperature compensated settings.