For deep cycle batteries the standard Amp Hour rating is for 20 hours. Actually, the detail is so common that most battery labels don’t incorporate this data. The Amp Hour rating would mean, for example, that if a battery has a rating of 100AH @ 20 Hr rate, it can be discharged over 20 hours with a 5 amp load. If it has the rating of 200 AH, it can handle a 10 amp load for 20 hours.
It is imperative to know that deviations from this standard of “20 hours” are possible and available for use. Some battery producers have distinctive rates for their amp hour specification, like: 5 Amp Hr Rate and 10 Amp Hr Rate.
Figuring out How Long a Battery Will last Using Amp Hours
You may face a few challenges when you attempt to focus on precisely how long your battery will last. There are two essential reasons behind this:
a) To start with, the AH rating is one that is focused not only on a specific period of time, but also a particular current draw (as per Peukert’s Law).
b) Second, current drawn is seldom steady in most vehicles. For example: we may keep all the lights of a vehicle on and at times they are completely off. The stereo volume also varies according to our personal needs. This unpredictable environment makes it difficult to determine precisely how long a battery will last.
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