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There is a lot of hard data on depth discharge vs cycle life for GC batteries from Trojan and others, but nothing from AGM manufacturers.
My gut is that a true deep cycle battery like the Trojan golf cart battery has about the same cycle life vs depth of charge capability as an AGM. AGMs shouldn't have the same sulfation problems which is the bane of FLA batteries.
And to the PPs comment above, both AGMs and golf cart batteries lose life if routinely discharged below 50%.
Firefly carbon foam batteries are supposed to tolerate 80% depth of discharge well but I don't know why. And of course lithiums can go to 90% routinely.
David
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