Symptom
DC VOLTAGE
CHECKS
(CONTINUED)
System float voltage
less than 2.25 v/c
average at 77°F
(25°C).
Charger output set
incorrectly.
Undercharging will
result in a gradual loss
of operating time and
capacity with successive
discharge cycles. If
allowed to persist, an
irreversible level of lead
sulfate will develop on
the plates with the result
of a permanent loss of
capacity.
Reset the charger
output voltage to the
recommended value.
Equalize the battery
system for from 48 to 72
hours and perform a
capacity test. If capacity
loss is permanent,
replace the total
battery system.
System equalize
voltage is greater
than 2.4 v/c
average.
Charger equalization
voltage is set
incorrectly.
Overcharging will cause
excessive gassing and
drying ot the electrolyte
and will contribute
to potential thermal
runaway.
Reset the charger
output voltage to the
recommended value.
Possible Causes Possible Result Corrective Actions
System equalize
voltage is less than
2.4 v/c average.
Charger equalization
voltage is set
incorrectly.
Equalization and boost
charging will be less
effective and will require
extended time.
If possible, reset the
charger output voltage to
the recommended value
or accept longer
equalization time.
Individual battery float
voltage less then 2.2
v/c average.13.2 VDC
for 6 cell battery. 6.6
VDC for 3 cell battery.
4.4 VDC for 2 cell
battery. 2.2 VDC for 1
cell battery.
Potentially the
individual battery
has a shorted cell.
Could be verified
with an impedance
or conductance
check.
Reduced operating time
under load. Increased
float current. Heating of
cell during discharge.
Contributes to potential
thermal runaway.
Replace the
individual battery.
Individual battery float
voltage greater than
2.42 v/c average.14.5
VDC for 6 cell battery.
7.3 VDC for 3 cell
battery. 4.8 VDC for 2
cell battery. 2.4 VDC
for 1 cell battery.
Potentially there
may be open cell in
the individual
battery. This can
be confirmed by
checking for zero
float current or
checking for a very
high impedance of
the battery.
Failure to support
the load. Could result in
an internal arc which
could ignite the gasses
within the cell.
Replace the
individual battery.
TABLE 1-VRLA Battery Symptoms and Solutions (Continued)
41-7546/0213/CD 15 www.cdtechno.com
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