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What is a marine battery?
Marine batteries are considered a "hybrid" battery which actually falls between the starting and deep-cycle batteries. Marine batteries are usually rated using "MCA" or Marine cranking amp which is rated 32 degrees F, while CCA is at zero degree F. (For more information on CCA, CA & MCA, please see below)
What is the Amp Hour (Ah) rating?
An amp-hour is one amp for one hour, or 10 amp for 1/10 of an hour and so forth. It is amp X hours. If you have something that pulls 20 amp, and you use it for 20 minutes, then the amp-hours used would be 20 (amp) X .333 (hours), or 6.67 AH. The accepted AH rating time period for batteries used in solar electric and backup power systems (and for nearly all deep cycle batteries) is the "20 hour rate". This means that it is discharged down to 10.5 volts over a 20 hour period while the total actual amp-hours it supplies is measured. Sometimes ratings at the 6 hour rate and 100 hour rate are also given for comparison and for different applications. The 6-hour rate is often used for industrial batteries, as that is a typical daily duty cycle. Sometimes the 100 hour rate is given just to make the battery look better than it really is, but it is also useful for figuring battery capacity for long-term backup amp-hour requirements.
What is a VOLT?
A Volt is the unit of measure for electrical potential.
What is a WATT?
A WATT is the unit for measuring electrical power, i.e., the rate of doing work, in moving electrons by, or against, an electrical potential. Formula: Watts = Amperes x Volts.
