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The systems are designed to maintain battery pack temperatures when
on-plug as well as during the drive cycle, and may not be able to heat or
cool batteries that have reached excessive temperatures.
Battery temperatures tend to be warmer than outside temperature if
driven and fully charged each day. If left off-plug, the batteries will
eventually equalize to outside underbody temperature, although this
process can take several days to occur. Extended periods off-plug in cold
outdoor temperatures can cause the batteries to take several days to
warm up.
The heaters maintain the battery pack at approximately 20° (68°F) and
are effective to at least –20°C (–4°F). The cooling fan utilizes outside air,
and therefore cooling effectiveness depends upon the temperature
difference between the batteries and outside air. The cooling system
works to maintain the batteries at approximately 35°C (95°F).
Equalization
The battery control system will periodically equalize the charge in the
batteries, which smooths out battery-to-battery differences in the ability
to deliver energy. This results in optimum range and battery life.
Equalization is automatically performed approximately every three
weeks. The fuel gauge will indicate if insufficient charge time has been
allowed.
The Ranger Electric Vehicle should be connected to a PCS
whenever it is not being driven.
Battery pack heating/cooling system (nickel metal hydride type)
The battery pack assembly contains 25 twelve-volt batteries, wiring, two
fans for ventilation and cooling and a control system. Following a
complete charge, battery heating is accomplished by periodically
overcharging the batteries to maintain a minimum acceptable
temperature. These components work automatically when the vehicle is
on-plug charging, and are monitored by the battery pack control system.
Heating and cooling do NOT occur key OFF and off-plug. The systems
are designed to maintain battery pack temperatures when on-plug as well
as during the drive cycle, and may not be able to heat or cool batteries
that have reached excessive temperatures.
Battery temperatures tend to be warmer than outside temperature if
driven and fully charged each day. If left off-plug, the batteries will
eventually equalize to outside underbody temperature, although this
process can take several days to occur. Extended periods off-plug in cold
Charging
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