People who own recreational vehicles (RVS) and boats are familiar with rv batteries deep cycle. These batteries are also common in golf carts and large solar systems (days generate power during the day, and batteries store some of the power used at night). If you have read this article on how emergency systems work, you also know that the alternative to a gasoline-powered generator is an inverter powered by one or more deep-cycle batteries.
Car batteries and rv batteries deep cycle are both lead-acid batteries, and they use the exact same chemical reactions (see how batteries work for more information). The difference lies in the way batteries optimize their design:
A car's battery is designed to deliver a lot of current in a short amount of time. This current surge is needed to flip the engine during startup. After the engine starts, the alternator provides all the power the car needs, so the car battery may be able to run down for its entire life without using up more than 20 percent of its total capacity. Used in this way, car batteries can last for years. To achieve large amounts of current, car batteries use thin sheets to increase their surface area. rv batteries deep cycle are designed to provide a steady current over a long period of time. rv batteries deep cycle can provide a current when needed, but there is no surge like a car battery. rv batteries deep cycle are also designed to be discharged over and over again (which can quickly damage a car battery). For this purpose, rv batteries deep cycle use thicker plates.
Car batteries typically have two scores:
CCA (Cold Crank Amplifier) -- The number of amplifiers the battery can produce at 32 degrees F (0 degrees C) for 30 seconds (reserve capacity) -- The battery can provide a minute count of 25 amps while maintaining the voltage over 10.5 volt type. The deep cycle battery will have two or three times the RC of the car battery, but will provide half or three quarters of the CCA. In addition, rv batteries deep cycle can withstand hundreds of total emission/charge cycles, whereas car batteries are not designed to discharge completely.