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Thread: Battery choices

  1. #1
    Join Date
    Mar 2009
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    Texas
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    Default Battery choices

    Interesting to look at new battery tech that is available in real life.

    I just grabbed this info while sitting at the airport. Take it with a grain of salt.

    I’m trying to decide whether to build a LiFePo4 for a fixed solar application. The LiFePo4 looks pretty good. 5000 cycles to 90+%. Wow. Cells are available in houston.



    Regular AGM
    -21 cents per wh


    Silicate-salt/lead crystal/silicon dioxide (SiO2)
    -Great temp range. Charge and forget. Medium depth of discharge. Heavy. New-ish. Long life. Low fire risk.
    -32 cents per wh


    https://watts247.com/product/12v-24v...15yr-lifespan/


    LiFePo4 rack mount Batteries are about $1500 for 4800 watt hours
    -Need to protect from temp extremes. Low fire risk. Long life.
    = 31.25 cents per wh


    https://www.signaturesolar.com/produ...battery-by-eg4

    DIY LiFePo4-16*$137 each=$2,192 + BMS (overkill at about $175 all in) + $100 (capacity tester and power supply)=$2,467 for 14,592 wh
    =17 cents per wh
    Last edited by bluedog225; 01-01-2022 at 03:48 PM.

  2. #2
    Join Date
    Apr 2004
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    Brisbane QLD (Everton Park)
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    Default Re: Battery choices

    I've got 300Ahs of LiFePo4 prismatic cells made into two, 12v batteries, both with JBD / Overkill BMSs with Bluetooth -(a must have). I haven't had them long but they test to spec. I bought from Alibaba, 8, 300Ah cells were $1600 Aus delivered. BMSs, battery boxes and waterproof 24v 40A charger bought separately. Would be hard to go back to lead-acid now.
    =~=~=~=~=~=~=~=~=~

    When we remember we are all mad, the mysteries disappear and life stands explained.

    Mark Twain

  3. #3
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    Default Re: Battery choices

    but does one need to know what all that means ?

  4. #4
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    Default Re: Battery choices

    Quote Originally Posted by wizbang 13 View Post
    but does one need to know what all that means ?
    Only if you choose to assemble a battery.
    =~=~=~=~=~=~=~=~=~

    When we remember we are all mad, the mysteries disappear and life stands explained.

    Mark Twain

  5. #5
    Join Date
    Mar 2009
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    Texas
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    Default Re: Battery choices

    Here’s a basic video. It’s a couple of years old but demonstrates all the concepts. The cells available have changed since then. As has the pricing on new, pre assembled 12 volt batteries. Some good second and third tier stuff available now for significantly less than a battle born.


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