Global Power Technologies 61
S-8500
APPENDIX J
BATTERY CHARGING OPERATION
Correct setup of the TEG system is required to charge the station battery optimally for the specific
application. Over or undercharging station batteries can severely limit their operating life and may
limit the overall system’s ability to provide reliable remote power.
Lead acid batteries require higher charging voltages at lower temperatures and conversely lower
charging voltages at higher temperatures for optimum charging; this is the effect of temperature
compensated battery charging (TCBC). If the battery system is exposed to temperatures outside
of 20-30ºC, change the power electronics mode to TCBC and connect the required optional bat-
tery temperature sensor to the power electronics and mount it on one of the battery posts. The
sensor measures the thermal temperature of the battery; it most often is not the same as the
ambient temperature because the battery is in use. The output charging voltage will be adjusted
automatically using this measured temperature. The sensor is required for TCBC to be effective.
(See Appendix H for the location to connect the sensor to the power electronics)
The TCBC mode can only be used for lead acid batteries. Note that there are multiple types of
lead acid batteries, which may require different charging voltages for the given application.
WARNING: Always refer to battery manufacturer specifications for the re
-
quired application’s charging voltages, depth of discharge versus battery
life data, and capacity versus temperature data.
WARNING: If the required temperature sensor is not used, which will
adjust the output charging voltage, then the battery may not be ideally
charged according to the manufacturer’s specifications.
Note that as batteries age with use and cycling, the time to charge will likely increase and should
be considered in the application.
WARNING: Always disconnect the output from the TEG (load and station
battery) prior to making changes to the output voltage set point.
Charging Mode Applications
If the TEG is not in a float or cycle charging application, then the default operation is fixed voltage
power supply mode.
This is the default factory mode setting; it provides a regulated output
voltage.
The TEG output charging voltage to be set will depend on either a float charging or cycle charging
application.
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