Figure 16, Bts Temperature To Charge Voltage Change - Magnum Energy MMS1012 Owner's Manual

Battery Temperature Sensor Operation
perature Sensor (BTS) is used to determine the battery temperature
around the batteries. This information allows the multi-stage battery
charger to automatically adjust the battery charge voltages for opti-
mum charging performance and longer battery life.
When the BTS is installed, if the temperature around the BTS is below
77°F (25°C) the absorb and fl oat charge voltage increases. If the
temperature around the BTS is higher than 77°F (25°C), the absorb
and fl oat charge voltage decreases. See Figure 15 to determine how
much the charge voltage changes (increases or decreases) as the
temperature reading of the BTS changes. 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 compensated and the battery will maintain the charge it had
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.
T em p eratu re C o m p en satio n u sin g B T S
1 2 V D C u n its
+0.75 V
0.75
+0.6 V
0.6
+0.45 V
0.45
+0.3 V
0.3
+0.15 V
0.15
N o C hange
0
-0. 15V
-0.15
-0 .3V
-0.3
-0. 45V
-0.45
-0 .6V
-0.6
-0. 75V
-0.75
0C
0
32F 41F

Figure 16, BTS Temperature to Charge Voltage Change

© 2010 Magnum Energy, Inc.
5C 10C 15C 20C 25C
5 1 0 1 5 2 0 2 5
50F 59F 68F 77F
Tem perature reading from BTS
3.0 Operation
The plug-in Battery Tem-
-
no B T S
c onnec ted
30C 35C 40C 45C 50C
3 0 3 5 4 0 4 5 5 0
86F 95F 104F 113F 122F
31