You should not use more than 5A load on a 100AH Battery as Deep Cycle Batteries don’t like being overloaded for long periods of time. The type of load described above is higher than the rated 5A for the 100AH Battery and will shorten its life considerably. Due to this, total runtime will be slightly lower.
The term theoretical is used because in practice, as the battery voltage decreases, the Amps drawn by the load increase proportionally. If you do not have the Amp rating, you can use the Watt rating to determine the Amperage using Ohm’s law below.Ģ.4 Hours is the theoretical run time before the battery is flat. 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.įor example, let’s take the below scenario into account. The 6 hour Rate is often used for industrial batteries, as that is a typical daily duty cycle. Sometimes ratings at the 6 Hour Rate and 100 Hour Rate are also given for comparison and for different applications. The 20 Hour Rate means that the battery is discharged down to 10.5V over a 20 Hour Period while the total actual AH that it supplies are measured.
Because of the variances that could occur in AH ratings, an industry standard was implemented.įor deep cycle batteries, the 20 Hour Rate is the accepted AH rating time period for the majority of Deep Cycle Batteries. If you discharge a battery over the course of 100 hours, the AH rating looks higher than if you discharge that same battery over the course of an hour. The Peukert Effect is directly related to the internal resistance of the battery. This is This is called the Peukert Effect. The battery’s AH rating decreases the faster you use it. An ampere is a unit of measure of the rate of electron flow or current in an electrical conductor.įor example, if you have an appliance that draws 20A and you use it for 20 minutes, then the amp hours used would be:Īs you’ll note from the equation above, The faster a battery is drained (discharged), the less overall amperage is available.
An ampere hour (abbreviated Ah, or sometimes amp hour) is the amount of energy charge in a battery that will allow one ampere of current to flow for one hour. All Deep Cycle batteries are rated in Amp Hours (AH).
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