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Charging
Commissioning charge
n
Before use, the batteries should be charged at a constant charging voltage
(with a charging current limited to 0.1C
•
Charge during 96 hours with the floating voltage between 2.27 and
2.30Vpc in ambient temperature range between 15 to 25°C.
•
or charge with the 2.40Vpc boost charge voltage during minimum 24
to 48 hours maximum to reduce the commissioning charging period
(the battery will then be switched over to float charging, maintain the
battery under floating voltage for 24 hours before any discharge test,
see hereafter).
If the battery is to be subjected to a discharge test, in this case the test will
be performed imperatively after that the commissioning charge has been
carried out. Check that the battery is fully charged.
Float voltage
n
The recommended float charge voltage is 2.28 volts per cell at 20°C.
Following a commission charge and after 6 months continuous charge at the
recommended float voltage, individual cell voltages will stabilise within ±4.5% of
the mean applied voltage.
However, immediately following commissioning and for the initial 6 months of
continuous float charge, individual cell voltage values outside the above tolerance
may be observed without adverse effect. There is no relationship between a
cell's float voltage and its discharge capacity. Cells are perfectly capable of giving
their discharge capacity even when outside the ±4.5% range.
After 6 months service, should any individual cell or monobloc show a continuing
reduction or increase in voltage outside the above limits over 3 successive
monthly periods, Enersys
should be contacted for advice.
®
When the average ambient temperature deviates more than ±5ºC from the
reference temperature (20°C), it is necessary to adjust the float voltage as
follows:
Temperature
0°C
10°C
20°C
25°C
30°C
35°C
40°C
If the charger does not permit an adjustment of float voltage in relation to
the temperature, it is possible to set a float voltage value according to the
temperature ranges as indicated in the last table of this publication.
Charging current
n
A discharged VRLA battery will accept a high recharge current, but for those
seeking a more economical charging system a current limit of 0.08 C
C
(A) is adequate.
3
Fast recharge
n
Increasing the charge voltage to 2.40Vpc with a current limited to 0.1 C
: 0.125 C
(A) can reduce recharge times. Fast charge should be stopped
3
afterapproximately 10 to 15 hours. This charge regime, in order to achieve a
normal service life, must not be used more than once per month.
Float charge ripple
n
Excessive ripple on the D.C. supply across a battery has the effect of
reducing life and performance. It is therefore recommended that voltage
regulation across the system, including the load but without the battery
connected, under steady state conditions, shall be better than ±1% through
5% to 100% load.
State of charge
n
The battery state of charge can be determined approximately by measuring
the open circuit voltage after the battery has been at rest for a minimum of
24 hours at 20°C.
Voltage
2.14Vpc
2.10Vpc
2.07Vpc
2.04Vpc
2.00Vpc
Open circuit voltage variation with temperature is 2.5mV per 10°C.
) with one of the following method:
10
Float voltage range per cell
2.33-2.36V
2.30-2.33V
2.27-2.30V
2.25-2.28V
2.24-2.27V
2.22-2.25V
2.21-2.24V
10
State of charge
100%
80%
60%
40%
20%
Discharging
PowerSafe
V batteries must not be left in a discharged condition after
®
supplying the load, but must immediately return to float recharge mode.
Failure to observe these conditions may result in greatly reduced service life.
Accidental deep discharging
n
For optimum operation the minimum voltage of the system should be related
to the duty as follows:
Duty
5 min ≤ t ≤ 1h
1h ≤ t ≤ 5h
5h ≤ t ≤ 8h
8h ≤ t ≤ 20h
In order to protect the battery it is advisable to have system monitoring and
low voltage cut-out.
Deep discharge will produce a premature deteriation of the battery and a
noticeable reduction in the life expectancy of the battery.
The effect of temperature
n
- on capacity
Correction factors of the capacity, according to the temperature, are as follows:
Discharge
0°C
Time
5 mins to
0.80
59 mins
1h to 24h
0.86
- on life
Operation of valve regulated batteries at temperatures higher than 20°C will
reduce life expectancy. Life is reduced by 50% for every 10°C rise in
temperature.
Maintenance/Checks
PowerSafe V are maintenance free, sealed, lead acid batteries and need no
water addition.
The containers and lids shall be kept dry and and free from dust. Cleaning must
be done only with a damp cotton cloth without man-made fibres.
WARNING - Do NOT use any type of oil, solvent, detergent, petroleum-based
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.
: 0.1
Check monthly that total voltage at battery terminals is (N x 2.28 V) for a
temperature at 20°C. (N being the number of cells in the battery). Make annual
readings of the voltages of cells making up the battery.
Keep a logbook to record values, power outages, discharge tests, etc.
10
An autonomy control can be done once a year.
Technical
Data when charging with a constant voltage
n
If the charger does not permit an adjustment of the float voltage in relation with
the temperature, it is possible to set a float voltage value and a recharging
voltage value according to the temperature ranges as indicated in the table
below:
Temperature
0°C to 10°C
10°C to 20°C
20°C to 30°C
30°C to 40°C
Minimum end voltage
1.65V
1.70V
1.75V
1.80V
5°C
10°C
15°C
20°C
25°C
0.86
0.91
0.96
1
1.04
0.90
0.94
0.97
1
1.03
Float Voltage
Recharging Voltage
2.34Vpc
2.31Vpc
2.28Vpc
2.25Vpc
TOP AND FRO NT
T
ER MI NAL DES I GN S
30°C
35°C
40°C
1.06
1.09
1.1
1.05
1.06
1.07
2.45Vpc
2.40Vpc
2.35Vpc
2.30Vpc
3
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