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Ascend Single Phase Charger Operation Manual
7.7. Optional Features
7.7.1. Battery Temperature Compensation
Charger Temperature Compensation will continually adjust the Charger output Float voltage based on
the ambient temperature in the battery room for temperatures from 3°C (37°F) to 40°C (104°F). An
external temperature sensor is mounted in a central location near the batteries to provide an average
ambient temperature. The probe must be in an area not directly affected by HVAC, sun light and drafts.
If the charger is in 'Equalize' mode, the Temperature Compensation is disabled.
The variable value is based on mV/°C/Cell. Therefore, the variable is multiplied with the number of cells
in the battery string. Variable values of 2 mV, 3 mV and 4 mV are available, while the default is 2 mV. For
example, a 60-cell system with a default variable of 2 mV the Float voltage will change by 120mV (60
cells x 2 mV) for every 1°C of temperature change. The variable corresponds to a curve, which is
illustrated below. Note the Float voltage setting is based on 25°C (77°F). To modify the Temperature
Compensation variable, go to User interface Setup -> Adjustments -> Temperature Compensation screen.
Consult the battery manufacturer to determine which setting is correct for your system battery.
2.4
2.35
2.3
2.25
2.2
2.15
2.1
0
Figure 28: Charger Voltage Set point vs. Battery Temperature
When this option is enabled, an external temperature probe must be connected. The number of cells
and volts per cell must be configured and the charger will calculate the final battery voltage. The Battery
Temperature can be viewed in the Metering screen.
Temperature Compensation configuration is made through the Setup Menu along with enabling and
disabling the compensation function.
95-100167, Rev A
2 mV/°C/Cell
5
10
15
Temperature (°C)
4 mV/°C/Cell
20
25
30
40
35
40
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