If boondocking with solar, I recommend flooded deep cycle batteries. AGM care manuals typically state that they require a 100% recharge frequently.
Flooded batteries will tolerate partial recharges better, although all lead acid batteries should be stored at 100% state of charge.
Besides, during the learning stage of living on batteries, killing flooded batteries is much cheaper. I've gotten 6 years of heavy use with cheap Sams Club batteries.
Although # of cycles and care determine the life of all batteries, I would be disappointed if I only got 3 to 5 years out of AGM batteries.
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