Equalization Charge
Equalization Charge
Find out about the equalization charge for lead acid batteries
storageIndividual batteries and individual cells within
lead acid batteries react differently to be charged. Over time battery
performance will drop as differences become more pronounced. At this stage it is necessary to perform an
equalization charge (or
refreshing charge) - usually once every 10 cycles, at least
once per month, or when the range of voltages across the
battery bank's batteries is
over 0.30 volts.
nb. An
equalization charge must
only be performed on
vented (not sealed) wet lead acid batteries.
Carrying out an Equalization Charge
An
equalization charge is a
current-limited charge carried out at
higher voltages than normal in order to bring all cells within all batteries to
100% charge. A typical lead acid
battery charger uses a fixed charging voltage of 13.6 volts in day to day operation. During equalization this charging voltage is increased to
14.4 volts and higher ensuring that all cells receive the current necessary to get them fully charged. Those cells which are already at 100% charge are
overcharged and therefore
vent gas as the electrolyte boils.
The
voltage of the battery can increase to as much as 16+ volts during equalization and so it is important to
disconnect any voltage sensitive equipment from the battery before beginning to prevent damage occuring.
Equalization is the best way to increase the
longevity and
efficiency of lead acid batteries, but great care has to be taken to ensure that the batteries are not overcharged for too long.
Article Last Modified: 15:13, 19th Aug 2008Comment on this Article
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