I've come across many AGM failures, mostly in solar battery banks. Main issue is the "equalization" mode that most good quality battery bank chargers have. In general, battery banks are supposed to be overvolted every few months to preserve life. This mode called "equalization" on most chargers. Works fine on flooded lead acid batteries, and tends to ruin AGMs, thus the problem.
AGMs can be fine, but I've yet to see any on the market that are cost-effective as compared to conventional FLA batteries, in long-term deep cycle type use. If you own a piece of equipment or a battery bank, and tend to keep it many years - then you can calculate your battery cost by price per month per watt. Taking into consideration, the new price of the battery, average life span, type of warranty, actual cost of warranty if batteries not stocked locally, etc. - it's not too hard to figure. I priced a 1200 amphour battery bank recently. Using flooded lead acid batteries, it'd have a cost of $10.30 per month for 10 years. Same 1200 amphour bank with AGMs has a projected cost of $41 per month for 5 years. Obviously, this can change quickly if prices change between the two battery types at differing rates.
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