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Battery Maintenance
975-0012-01-02 Rev A B–15
Equalization Charging
Purpose An equalize charge helps to remove sulfate buildup on the battery plates and
balances the charge of individual cells.
Effect Equalize charging also produces gassing which stirs up the electrolyte mixture
and helps distribute the acid more evenly.
Non-equalized
batteries
Batteries that are not equalize charged can be damaged by sulfate accumulation,
thus sealing off a percentage of the plates and reducing battery capacity. They may
also have sulfuric acid accumulate at the bottom of the battery, potentially
damaging the plates. At the same time, the electrolyte at the top of the battery gets
watery. This effect is called stratification.
Frequency Every month or two the batteries should be equalize charged.
CAUTION: Damage to DC Loads
The high voltages reached during an equalize charge may damage DC loads that
are connected to the inverter. Disconnect any DC loads from the inverter before
running an equalize charge.
CAUTION: Damage to Batteries
Equalization should be done for standard electrolyte vented batteries only. Sealed
or GEL cell batteries should not be equalize charged. Consult your battery
supplier for details on equalize charging for the battery type in your system.