Quick Answer
An equalization charge should last anywhere from 2 to 6 hours, depending on the battery size, depth of discharge, and equalization method used. The goal is to maintain a consistent voltage during the charge period.
Understanding Equalization Charging
Equalization charging is a crucial process for maintaining the health and longevity of deep cycle batteries. It involves applying a high charge rate to each cell to ensure that all cells are at the same state of charge. This helps to eliminate sulfation, a common issue that can lead to battery failure.
Choosing the Right Equalization Method
There are several equalization methods to choose from, including the “voltage ramp” method and the “current limited” method. The voltage ramp method involves slowly increasing the voltage to a set point over a period of time, typically 1-2 hours, while the current limited method involves limiting the charge current to a set value. For a 12V system with 6 batteries in series, a good starting point for the voltage ramp method would be to set the voltage limit to 14.4V, and for the current limited method, a charge current of 20-30A is typically used.
Determining the Equalization Charge Time
The equalization charge time will depend on the battery size and the depth of discharge. A good rule of thumb is to equalize a battery for at least 2 hours, and up to 6 hours for larger batteries or those with a high depth of discharge. For example, a 200Ah battery with a 50% depth of discharge may require a 4-6 hour equalization charge, while a 100Ah battery with a 20% depth of discharge may require only a 2-3 hour charge. It’s also important to note that equalization charging should be done at a temperature between 20-30°C (68-86°F) for optimal results.
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