Quick Answer
Equalization Charge is generally better than a Standard Charge in maintaining and extending the lifespan of deep cycle batteries used in renewable energy systems.
Why Equalize?
Deep cycle batteries require regular equalization charges to maintain their health and extend their lifespan. A Standard Charge is not enough to remove the buildup of lead sulfate crystals on the plates, which can cause a decrease in battery capacity and eventual failure. Regular equalization charges can increase battery lifespan by 20-30%.
How to Equalize Safely
To equalize safely, disconnect all loads and inverters, then charge the battery bank at 1.5-2.5 volts per cell above the normal charge voltage for 2-3 hours. For example, if the normal charge voltage is 14.4 volts, the equalization charge voltage would be 16.4-17.4 volts. Monitor the temperature and voltage to prevent overheating and excessive gassing.
Equalization Charging Techniques
There are two common equalization charging techniques: the ‘boost’ method and the ‘float’ method. The ‘boost’ method involves charging the battery to 1.5-2.5 volts per cell above the normal charge voltage for a short period (2-3 hours), then returning to the normal charge voltage. The ‘float’ method involves maintaining the equalization charge voltage for an extended period (6-12 hours) to ensure complete equalization. Both techniques are effective, but the ‘boost’ method is recommended for most applications due to its faster and more efficient nature.
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