High quality AGM batteries have lifespans of over 500 cycles with a 70% depth of discharge. This is another advantage of AGM over wet cells. I agree that wet cells should not be discharged to lower than 50% DOD.
Fair winds,
Eric
--- In electricboats@
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> AGM's are great batteries - IF - you can afford 3 to 4 times the cost of regular batteries and are willing to invest serious money in the correct battery recharging equipment. AGM batteries are very sensitive to over-voltage charging that will kill them very quickly. The modern 3-step or more charges with adjustible voltages for each step work the best.
> Remember that any battery using lead and acid can only be discharged 50% maximum before you start to do serious damage to the lifespan of the battery. That needs to be included in your calculations of how many AH of batteries you need.
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