A deep-cycle battery is a lead-acid battery designed to be regularly deeply discharged using most of its capacity. In contrast, starter batteries (e.g. most automotive batteries) are designed to deliver short, high-current bursts for cranking the engine, thus frequently discharging only a small part of their capacity. While a deep-cycle battery can be used as a starting battery, the lower “cranking amps” imply that an oversized battery may be required.
A deep-cycle battery is designed to discharge between 50% and 80% of its capacity, depending on the manufacturer and the construction of the battery. Although these solar batteries can be cycled down to a 20% charge, the best lifespan vs cost method is to keep the average cycle at about a maximum 50% discharge. There is a direct correlation between the depth of discharge of the battery, and the number of charge and discharge cycles it can perform.
Deep cycle solar batteries are often used in off-grid solar and wind power applications. Unlike a car battery, they are designed to be discharged to a greater depth and more often. The most common type of battery for deep cycle applications are AGM (Absorbed Glass Mat), Gel and Flooded.
At Sundriven, we are experts in flooded, AGM and Gel deep cycle battery technologies. If you need a helping hand in battery selection, contact our friendly team and they’ll be glad to assist you!
Did you know you might be also eligible for a renewable energy rebate if you buy a deep cycle battery as part of a full system? Ask our team for further details.