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Thread: Batteries

  1. #1
    Iridium
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    Batteries

    I've been researching the heck out of batteries. If designing a system from scratch, Lithium Iron Phosphate seems to win. But, you are dealing with the complication of a BMS (battery management system), built into the battery. Basically, a "smart" battery.

    Lead acid, AGM, or GEL, or dumb batteries, just lack the capacity, or longevity of the lithium.

    Firefly batteries, an AGM carbon foam, batteries, you can discharge down to nothing, and won't damage them, and have cycles up to 3000. Basically they should last you 10 years, if you are hard on them. If you are easy on them, like most of us during non SHTF, 20 years?
    life is good.

  2. #2
    Great Value Carrots
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    Re: Batteries

    You could take a course at a technical college and still not know all about batteries. Hell of a lot to know. I think everyday experience trumps any reading or second hand info. Hoarder could probably give us the lowdown on solar. One thing I do know from reading reviews of products is that what the claims are, are very different from the realities.
    " If you are on the wrong road progress means doing an about-turn and walking back to the right road and in that case the man who turns back soonest is the most progressive man. There is nothing progressive about being pig-headed and refusing to admit a mistake. And I think if you look at the present state of the world it's pretty plain that humanity has been making some big mistake. We're on the wrong road. And if that is so we must go back. Going back is the quickest way on. ---C. S. Lewis

  3. #3
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    Re: Batteries

    Don't get hung up on battery life. You might spend $600 or so on a 200 ah lithium iron phosphate that weighs 50-60 lbs and has all the life and capacity you think you need ... and it is so compact, so valuable and so portable .. .some thief is sure to nail it.

    Instead go for the 40 ah marine deep cycles for $80. Low tech. Heavy. Cheap ... and if you a thief you will likely go for something more valuable ... So what if it wears out in 3 years. An no BMS. All you need to maintain it is distilled water.

    If you really want cheap and light put together a super capacitor cell. These can weigh 10% of a lead acid and can directly substitute for a 12v battery. A 6 lb capacitor bank can start your car. They have much more current available for starting because unlike batteries they have virtually no internal resistance.

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  5. #4
    Iridium
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    Re: Batteries

    Quote Originally Posted by woodman View Post
    You could take a course at a technical college and still not know all about batteries. Hell of a lot to know. I think everyday experience trumps any reading or second hand info. Hoarder could probably give us the lowdown on solar. One thing I do know from reading reviews of products is that what the claims are, are very different from the realities.
    I'm getting to the point where I'd like to take a test at a technical college, get some some "cert" in battery knowledge.

    It would be nice if Hoarder was around to chime in.

    From everything I've learned, and honest reviews, firefly batteries seem to win hands down.
    life is good.

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