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Deep-cycle includes solar electric (PV), backup power, and RV and Marine batteries. The major construction types are flooded (wet), gelled, and AGM (Absorbed Glass Mat). Deep cycle batteries can be discharged down as much as 80% repeatedly, and have thicker much more durable plates than “cranking” or starting batteries.
Reducing the average DoD (Depth-of-Discharge) and the number of discharge/charge cycles, by proper deep cycle battery or battery bank sizing will significantly increase a deep cycle battery service life. For example, a pasted plate wet battery with an average of 50% DoD will last twice as long or more as if it is has an 80% average DoD. A 20% DoD average battery can last up to five times longer than one with a 50% DoD average.
Wet Golf cart batteries will typically have an average 225 cycles at 80% DoD and 750 cycles at 50% DoD. Always avoid Depth-of-Discharges that are greater than 80%. The "sweet spot" (optimum DoD for the greatest amount of power produced over the service life) is generally somewhere between 20% DoD and 60% DoD average. For the AGM (Ca/Ca) VRLA battery example below the"sweet spot" is approximately 22.5% DoD based on the greatest amount of power produced.
AGM (Ca/Ca) Life Cycles vs. Percent Depth-of-Discharge (DoD)
For more information about a Deep Cycle battery that is right for your needs, contact your local Powerstride Battery location for the most complete selection of Deep Cycle Batteries and Chargers!