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Tab. 5: Nominal electrolyte specific gravity
Tubular
OPzS
design
TS
Pasted
Vb
design
OGi
Nominal S.G.
1.240kg/l
at 20°C
Electrolyte
Max
level
Float voltage
2.23 V/c
at 20°C
Tab. 6: S.G. values according to electrolyte
level (at 20°C in kg/l)
Tubular positive plate cells
TYPE
Medium
Minimum
OPzS, TS
1.260
1.250
Pasted positive plate cells
TYPE
Minimum
Medium
OP
1.265
1.250
Vb
1.260
1.250
OGi
NOMINAL LEVEL
Correction of S.G. according
to temperature
Electrolyte
S.G.
varies
temperature. If temperature is above or
below 20°C, specific gravity readings must
be corrected.
The temperature correction factor for S.G.
is –0.0007 per °C.
Example: S.G. of 1.230 kg/l at +35°C
corresponds to a S.G. of 1.240 kg/l at
+20°C.
DISCHARGING
End of Discharge Voltage
The battery must not be discharged more
than the capacity specified in the
performance tables. Deeper discharges
may damage the battery and shorten its
operational life. As a general rule the end
of discharge voltage shall be limited to the
values listed below:
Tab. 7: end voltages
Discharge time
End voltage
5 min < t < 59 min 1.60 V/c
1h < t < 5h
1.70 V/c
5h < t < 8h
1.75 V/c
8h < t < 24h
1.80 V/c
Individual cell voltages may fall below UE
by not more than 0.2 V/c. A low voltage
disconnect is recommended to prevent
deep discharge. Special attention should
be given to small loads that are not
automatically disconnected at the end of
discharge
Discharged Cells
Batteries must not be left in a discharged
condition after supplying the load, but
must be immediately returned to recharge
mode. Failure to observe these conditions
may result in greatly reduced service life
and unreliability.
Important notice:
Each deep discharge is abusive and could
affect the life expectancy of the battery.
OP
TESTING
Capacity tests are to be carried out in
1.250kg/l
accordance with EN 60896-11. Check that
the battery is fully charged. Before testing
Medium
new batteries it must be ensured that a
2.23 V/c
sufficient commissioning charge has been
applied, the S.G. is relating to the nominal
value (± 0.01 kg/l) and the battery is fully
charged. Lower S.G. results in lower
capacity.
Maximum
RECHARGE
1.240
After a discharge the battery can be
recharged at the operating voltage (float
charge voltage).
Maximum
To reduce the charging time the recharging
can be carried out with the boost charge
1.235
voltage of 2.33 to 2.40 V/c. The recharging
times depend on the charging procedure
1.240
and on the charging current available.
Generally 10 to 20 hours duration can be
expected at charging currents between 5 A
and 40 A per 100 Ah nominal capacity.
Recharge 1.2 times the discharged
with
capacity.
During recharging up to 2.40 V/cell the
effective value of the A.C. ripple current
can reach a temporary maximum 10 A per
100 Ah nominal capacity.
Equalising Charge
After a deep discharge or after inadequate
recharging, an equalising charge is
necessary. This can be carried out as
follows:
a) at constant boost charge voltage of
2.33 – 2.40 V/cell for a maximum of
72 hours.
b) with I charge method according to the
commissioning charge paragraph above,
clause b).
If the maximum temperature of 45°C is
exceeded, charging must be terminated or
continued at a reduced current or
temporarily switched to float charging.
The end of equalising charge is reached
when the S.G. of the electrolyte and the cell
voltages have not risen for a period of 2
hours.
Because the permissible system voltage
level may be exceeded when charging at
increased voltages, suitable measures
should be taken to protect the load circuits,
e.g. charging «off line».
MAINTENANCE/CHECKS
Water topping
Top up the electrolyte level to the nominal
level, but without exceeding the « Max »
mark. Only demineralised or distilled
water (purity grade: max. conductivity 10
µS/cm) shall be used.
After topping-up an equalising charge can
be applied to reduce the time for
homogenisation of the electrolyte density.
Cleaning
Keep containers and lids dry and free from
dust. Cleaning must be undertaken with a
damp
man-made fibres.
WARNING - Do NOT use any type of oil,
solvent,
solvent or ammonia solution to clean the
battery containers or lids. These materials
will cause permanent damage to the
battery container and lid and will invalidate
the warranty.
If the battery, cell, lid or container is damp
with or shows signs of spilled electrolyte,
wipe with a cloth dampened with a
solution of sodium bicarbonate and cold
water, mixed in the proportions of 1.0
lb/1.0 gal (0.5 kg/5.0 liter) of water. Follow
this by wiping with a cloth dampened in
clear water.
Avoid static discharges generated during
cleaning.
Plugs
Leak-resistant plugs with a frit or flame
arrestor plugs with a ceramic funnel must
not be cleaned with water or positioned up
side down. Should the frit be moistened
with electrolyte, the plug must be replaced
during regular maintenance. Standard
plugs without frit can be cleaned with
purified water if necessary. Dry them
thoroughly before fitting them back onto
the battery.
Readings – Log book
Every 6 months, check the total voltage at
the battery terminals. Also check the
voltage, S.G., and the temperature of pilot
cells and record the room temperature.
Once a year, in addition to the above, take
readings of individual voltages and S.G. of
the electrolyte. Measure the S.G. either
before topping up water or after boost
charge.
Keep a logbook in which the measured
values can be noted as well as power cuts,
discharge tests, equalising charges,
topping up dates, storage times and
conditions, etc.
SPECIAL APPLICATIONS
Whenever the battery cells or monoblocs
are to be used for special applications such
as repeated cycling or under extreme
ambient conditions please contact your
SALES OFFICE.
For further information please visit our
website: www.enersys.com
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