206
ELECTRICAL INSTALLATION
CHARGING AND MAINTAINING THE
BATERY
A) Charging on the vehicle and out-
side the vehicle
1. Systematic overcharging and dis-
charging of battery damages and
shortens its life. Correctly adjusted
charging system maintains battery
near to the fully charged status. At
set level of voltage (13,8 - 14,4 V) in
charging system and average tractor
operation it is sufficient to check and
maintain the level of electrolyte by
distilled water once per six month.
2. At heavier operation and another
level of regulated voltage it is neces-
sary more frequent checking the
level of electrolyte. Overcharging the
battery on vehicle (more than 14,4 V)
causes bigger loose of electrolyte.
3. It is necessary to charge the battery
removed from the vehicle or in the
vehicle which is not in operation (see
storage of charged batteries with
electrolyte). It is also suitable to
charge battery in vehicle before
wintertime and after wintertime. In
winter season and strong frost the
electrolyte might be frozen at almost
discharged
battery
(density
of
electrolyte 1,12 - 1,15 g/cm
3
) in this
case the life will be substantially
reduced (disintegration of active
agent and destroy of battery case).
Heavily discharged battery (density
of electrolyte lower than 1,07 g/cm
3
)
might be frozen already at several
degrees below zero.
4. Charge the battery by current that is
0,1 of total battery capacity (or lower)
up to fully charged status.
5. Charging
device
with
constant
voltage 14,4 V can be also used.
Charging time can be max. 30 hours
according to status of discharging.
6. Fully discharged battery must be
charged as soon as possible, other-
wise its full capacity can not be re-
stored.
B) Charged battery
1. Battery
is
considered
as
fully
charged if all battery cells generates
the gas with same intensity. If the
electrolyte density is 1,28 g/cm
3
in all
cells and if the total voltage of battery
is within 15,3 - 16,5 V, measured
with the prescribed charging current.
2. Status of full charging is confirmed
when the received density of electro-
lyte and level of voltage is not
changed within farther two measure-
ments following after two hours.
3. For example the charging status for
your orientation: status of charging
corresponds to density of electrolyte.
Charging status is characterized by
density
of
electrolyte
and
is
measured by densimeter. Every cell
needs to be measured.
Status of charging = density of
electrolyte
charging status
Electrolyte density
100 %
1,28 g/cm
3
70 %
1,23 g/cm
3
50 %
1,20 g/cm
3
20 %
1,15 g/cm
3
0 %
1,12 g/cm
3
C) Storage of charged battery with
electrolyte
1. Before storage the battery must be
charged up to final symptoms of
charging. It must be disconnected
from charging system, cleaned and
with plugs.
2. Battery that is built into a plastic case
from polypropylene must be charged
after three month of storage because
of smaller self-discharging.
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