Quick Answer
Equalization charging of sealed lead-acid batteries involves forcing an overcharge to equalize state of charge and remove sulfation buildup in deep cycle batteries, usually once a month.
Understanding the Process
Equalization charging requires careful consideration to avoid overcharging, which can damage batteries. A dedicated equalization charger or a modified charge controller can be used to control the process. The charger should be set to 2.4-2.7 volts per cell for lead-acid batteries, typically for 1-2 hours, and then discharged to 50% depth of discharge (DOD) to ensure full equalization.
Preparing for Equalization
Before starting equalization charging, disconnect any loads and ensure the batteries are fully charged, but not overcharged, to avoid thermal runaway. Disconnect any charging sources, including solar panels, and set the equalization charger to the recommended voltage. Equalization can be performed once a month, or as often as every 2 weeks in high-demand applications. Monitor the battery temperature and voltage during equalization to prevent overheating.
Safety Precautions and Monitoring
Equalization charging can be hazardous if not done correctly. Ensure proper ventilation to prevent hydrogen gas buildup, and use fume extractors if necessary. Monitor the battery voltage, current, and temperature during equalization to ensure the process is within recommended parameters. If the battery temperature exceeds 125°F (52°C) or the voltage drops below 2.0 volts per cell, stop the equalization process immediately.
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