Connecting two LiFePO4 batteries in ||

System
System Posts: 2,511 admin
in Off Grid Solar & Battery Systems #1
Hello,

I am interested in connecting two 12.8V 40Ah LiFePO4 batteries in parallel. Link to battery here:

http://www.batteryspace.com/lifepo4prismaticbattery128v40ah512wh100arate-1.aspx

In order to ensure proper equilibrium charge, would it make sense to connect each battery to it's own PCM? Link to PCM:

http://www.batteryspace.com/pcmprotectioncircuitmodulefor4cells128vlifepo4batterypackat16alimited.aspx

I have not been able to find a PCM that can connect 8 cells with two 4 cell blocks in parallel and so this is what I am thinking might work. Has anyone had any experience with this?

Thanks
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Comments

  • waynefromnscanada
    waynefromnscanada Solar Expert Posts: 3,009 ✭✭✭✭
    #2
    Re: Connecting two LiFePO4 batteries in ||
    sumedh546 wrote: »
    In order to ensure proper equilibrium charge, would it make sense to connect each battery to it's own PCM?

    To do otherwise would not allow me to sleep at night. No experience with these batteries, just read a lot.
    But almost $800 for an 80 AH 12 volt battery pack and controllers? That's pretty steep.
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  • techntrek
    techntrek Solar Expert Posts: 1,372 ✭✭✭
    #3
    Re: Connecting two LiFePO4 batteries in ||

    I thought we just had a thread recently where someone linked to an 80 ah 12 volt pack for something around $350?

    Edit: Nevermind, someone had linked to a site that supposedly had those specs @ $450, but I just looked and they are asking $900.

    To the OP: also check out Flooded Ni-Cad. Lighter than lead acid and with several advantages. Not as light as lithium though.
    4.5 kw APC UPS powered by a Prius, 12 kw Generac, Honda EU3000is
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