Quick Answer
To safely equalize a battery bank with multiple types, perform a series equalization charge, not a parallel equalization charge, and monitor the temperature, voltage, and current of each battery type. Set the equalization charge to 1.25 to 1.5 times the battery's nominal voltage. Use a charge controller or equalization system specifically designed for series equalization.
Understanding Series Equalization
Series equalization is the recommended method for equalizing a battery bank with multiple types, as it allows you to charge each battery in series, without the need for complex voltage and current balancing. This method is particularly useful when working with different battery chemistries, voltages, and capacities.
Preparing for Series Equalization
Before starting the equalization process, ensure that the battery bank is fully charged and the batteries are at room temperature. Disconnect any loads and turn off the charge controller or inverter. Identify the battery with the lowest state of charge (SOC) and connect it to the equalization system first. The equalization system should be capable of handling the maximum current and voltage of the battery bank.
Performing the Series Equalization Charge
Set the equalization charge to 1.25 to 1.5 times the battery’s nominal voltage, and monitor the temperature, voltage, and current of each battery type. The equalization process typically lasts between 2 to 4 hours, and the current should not exceed 10% of the battery’s capacity per hour. Use a data logger or monitoring system to record the equalization process and ensure that the battery bank reaches the desired state of charge.
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