wheels 543 Posted September 2, 2020 Share Posted September 2, 2020 12 hours ago, idlerboat said: Commercially graded AGMs have a 20 year constant use design time. This is misunderstood by so many. It relates to the internal connection between the plates and the ability to withstand corrosion. This is never explained by any manufacturer and the figure is very misleading. If the battery is never ever cycled, then it should last 20yrs before the internal inter-plate connections are not longer viable. The more expensive names tend to use very good corrosion resistant materials. However, cheaper manufacturers now also use similar materials and use this figure of longevity as a false positive feature in their claims. In fact I have come across several people that have thought their Battery was designed to last 20yrs when cycled. Which simply is not true. Cycle rates are still the best measure between any make of battery and the more expensive the Battery, the better that cycle number ( for same apple to apple battery type of course). In my opinion, the best choice of Battery is the Lead Carbon design. Providing weight is not an issue. Some makes are providing cycle rates nearly as high as Li and the cheaper ones are still producing cycle rates 3 times that of standard FLA. The problem with AGM and Gel is that you need to get a battery designed specifically for Deep cycle and that is in fact very hard to do. Most of these two, most especially the Gel types, is that they are mostly designed for Standby or UPS work. Meaning they are designed to stay trickle charged for extended periods of time without the need of equalisation charging and then be used in a deep cycle providing backup power. But their cycle rates are not so great. Lithium batteries (of the type we would be using..there are dozens of different types) should have battery management built into the Battery itself. It should be monitoring every cell as it charges. The issue with the Lithium batteries that have caught fire is due to a condition that the Cadnium batteries had. Filiments grow in the internals and eventually short out the cell. The poblem with the Lithium battery is that the short will then cause severe and sudden overheating and result in the thing exploding in flames. But there are now Lithium designs that are stopping this problem from occuring. Unless weight is really important, I think it is really hard to justify the expense of LiFePo technology. Quote Link to post Share on other sites
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