agm batteries

jontrachta
jontrachta Registered Users, Users Awaiting Email Confirmation Posts: 1 ✭
in Off Grid Solar & Battery Systems #1
looking to buy new agm batteries to replace old lead acid batts. what do you recommenc? 
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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,109 ✭✭✭✭✭
    edited June 2023 #2
    I'm partial to Full River deep cycle. Deep Cycle Batteries - Batteries & Battery Storage - Residential | NAZ Solar Electric (solar-electric.com)
    The forum host has these and many other quality AGM batteries. They only sell quality products.

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

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  • Marc Kurth
    Marc Kurth Solar Expert Posts: 1,170 ✭✭✭✭
    #3
    Concorde Sun Xtender and Fullriver have very strong reputations for building long-lasting true deep cycle batteries for PV systems. I can't count the number of people who buy a cheap AGM battery - and then complain about how AGM batteries don't live very long.  All AGM batteries are not the same.
    I have a lot of off grid customers getting 10+ years from the above brands, but I would say that 7-9 is typical with a properly designed system and proper charging. Remember that generally, these batteries die young from sulfation due to undercharging.
    Both are available through our forum sponsor. See the link above provided by littleharbor2

    Marc


    I always have more questions than answers. That's the nature of life.
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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,109 ✭✭✭✭✭
    edited June 2023 #4
    Marc Kurth said:
      All AGM batteries are not the same.

     Remember that generally, these batteries die young from sulfation due to undercharging.

    Marc

     
    My last set of AGM batteries called for 14.8 - 15.0 volts in cyclic use. Many "AGM" settings on charge controllers are 14.4 - 14.6 so you cant always just use preset charge points. Early AGM batteries had specific "not to exceed" voltage limits so these preset numbers have stuck with SCC mfg's. Your best bet is to seek out mfg. recommended settings.

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

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