John, Best I recall the Sams batteries I used were something like the EGC2 ?? Supposed to be slightly better and a bit more expensive then the regular EGC if I remember??? One important thing I experienced (I'm sure your already well aware of but to help Greg) to improve longevity is to keep them full and correctly charged (I use a so called "Smart" 4 stage charger) so as NOT to use up any of their finite number of "Life Cycles". With enough solar harvest and a good 3/4 stage solar charge controller if they never get below say 30% discharged as I sometime experience you're not quite consuming an entire "Life Cycle" and like you I can envision 7 to 8 years of life. To the contrary if a person discharges them to 50% on a regular basis I wouldn't expect them to last near as long. Depending on where I'm at and the degree and angle and time of sunshine and loads I often reach 100% SOC by mid morning After which my charger goes into its "Float" charge level of around 13.2 volts and stays there all day. Its AFTER the sun goes down and I'm running my second fridge and fans and water pump and electronics and the CPAP all night and some times furnace my batteries do their job and may discharge to 30% r 40% and over. But then early AM my wife may run the 4 KW genset a short time in which case my 80 amp charger kicks in to give the batteries a good "jump start" on the day prior to sunshine.
I would have to agree if you compare true apples to apples you're likely NOT going to see any HUGE difference in Trojan or Deka or several other battery brands so I consider dealers and common in stock products and other factors when deciding what to purchase......With so many golf cart dealers all over the country (and Im running 6 volt deep cycle units) I find its easier to buy Trojan then some other brands.
I haven't used but heard good about Crown and Rolls Surette but still go back to the sentence above to make a decision. As I noted I'm gonna try the AGM route next time. BOTH my chargers have AGM capability and settings. I'm NOT ready nor do I need the expensive Lithium at this time. Some dudes I know who use them have like 1000 amp hours of storage and may even run AC part of a day but I'm nowhere near that yet and don't plan to be lol I'm a MODEST energy user in my little 29 footer...
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