Using Ebay "LiFePO4" Batteries For A Battery Bank

solarpowerwindandstu
solarpowerwindandstu Registered Users Posts: 5 ✭✭
in Off Grid Solar & Battery Systems #1
I recently found this ebay listing :http://www.ebay.com/itm/12V-60AH-LiFePO4-Batteries-6A-Charger-BMS-Electronics-Parts-Rechargeable-700W-/131808965156?hash=item1eb06d3224:g:i7IAAOSwcL5XMYue

And was wondering what you guys think about it, to me it look's like cheap li-ion batteries with "LiFePO4" printed on them.
But if they really are LiFePO4 batteries then there a really good deal.
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  • oil pan 4
    oil pan 4 Solar Expert Posts: 767 ✭✭✭✭
    #2
    Those puny wire look like they could only handle discharging about 20 amps continuously, if that.

    Solar hybrid gasoline generator, 7kw gas, 180 watts of solar, Morningstar 15 amp MPPT, group 31 AGM, 900 watt kisae inverter.

    Solar roof top GMC suburban, a normal 3/4 ton suburban with 180 watts of panels on the roof and 10 amp genasun MPPT, 2000w samlex pure sine wave inverter, 12v gast and ARB air compressors.

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  • bill von novak
    bill von novak Solar Expert Posts: 891 ✭✭✭✭
    #3
    solarpowerwindandstu said:
    I recently found this ebay listing :http://www.ebay.com/itm/12V-60AH-LiFePO4-Batteries-6A-Charger-BMS-Electronics-Parts-Rechargeable-700W-/131808965156?hash=item1eb06d3224:g:i7IAAOSwcL5XMYue

    And was wondering what you guys think about it, to me it look's like cheap li-ion batteries with "LiFePO4" printed on them.
    But if they really are LiFePO4 batteries then there a really good deal.
    Depends on what you are going to do with them, of course.  Three in series might make a good ebike battery.
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,617 admin
    #4
    Here is the website for that battery setup (not sure if website is current or just an old one laying around):

    http://www.sun-ebike.com/

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,617 admin
    edited June 2016 #5
    I am posting this for Karrak (we are having a random problem with long time posters getting stuck in the spam queue).
    Unless the inbuilt BMS in this battery is properly designed and built the lifespan of the battery can be significantly reduced regardless how good the individual LiFePO4 battery cells within the battery are. Read the following for more information.

    https://ka7oei.blogspot.com/2013/05/lithium-iron-phosphate-lifepo4.html

    If you have enough electronic knowledge I would look at getting the individual cells and making up your own BMS or getting a complete unit with inbuilt BMS from a reputable supplier who is prepared to give a decent warranty with the battery.<br><br>If you do get a complete unit, it is good to have external access to the individual cell voltages so you can check to see if the battery is keeping in balance.

    Simon
    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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