Originally Posted by CarlF
If you don't plug
in every night or have a LOT of solar, AGM's are a bad choice for a house bank. My last set of Lifeline AGM's lasted less than 3 years despite careful use (never discharge below 50%, fully recharge overnight at dock
whenever possible, occasional 8 hour "conditioning charge")
Regular AGM's are great for start batteries or anything else that will only be slightly discharged and then fully recharged.
I agree on most of the points, with one exception. I got over 10 years out of my Lifeline AGM batteries. Technically those batteries are still going to my knowledge, however I sold the boat
I will look this weekend, however, I believe I'm on 5 years on my current Lifeline AGM batteries.
I find (YMMV) that not dipping down too deep and fully recharging are the key. I typically drop no lower than 12.7/12.8. The key to this is a combination of frugal usage with an oversized bank. I charge them every 12 hours and strive to completely charge if possible.
Disclosure: I only use the boat
Th/Fri - Sun 5-6 months of the year, with a stretch of 2-3 weeks during that 5-6 month period. Otherwise the boat is plugged into a dock.