Battery Temperature Sensor Operation; Figure 3-10, Bts Temperature To Charge Voltage Change - Magnum Energy MagnaSine Hybrid MSH3012RV Owner's Manual

Operation
3.4

Battery Temperature Sensor Operation

The plug-in Battery Temperature Sensor (BTS) is used to determine the battery's temperature.
This information allows the multi-stage battery charger to automatically adjust the battery charge
voltages for optimum charging performance and longer battery life.
With a BTS installed, if the temperature around the BTS is below 77°F (25°C) the absorb and fl oat
charge voltage increases, and if the temperature around the BTS is higher than 77°F (25°C), the
absorb and fl oat charge voltage decreases. See Figure 3-10 to determine how much the charge
voltage changes (increases or decreases) depending on the temperature reading of the BTS. For
example, the nominal absorb charge voltage for a fl ooded battery at 77°F (25°C) is 14.6 VDC. If
the battery temperature is 95°F (35°C), the absorb charge voltage would decrease to 14.3 VDC
(14.6 VDC – 0.3 change).
If the temperature sensor is NOT installed, the charge voltages will not be automatically adjusted
because of temperature, but will be maintained at a temperature of 77°F (25°C). The life of the
batteries may be reduced if they are subjected to large temperature changes when the BTS is
not installed.
Info: When the BTS is connected, the battery charger uses a value of -5mV/°C/Cell
from 0 – 50°C to change the charge voltage based on temperature.
+0.75V
+0.6V
+0.45V
+0.3V
+0.15V
No Change
-0.15V
-0.3V
-0.45V
-0.6V
-0.75V

Figure 3-10, BTS Temperature to Charge Voltage Change

Page 39
Temperature Compensation using BTS
0C 5C 10C 15C
32F 41F 50F 59F
Temperature reading from BTS
no BTS
connected
20C 25C 30C 35C 40C
68F 77F 86F 95F 104F
© 2020 Sensata Technologies
45C 50C
113F 122F