Interesting LiFePo4 battery configuration

OldManOldMan Registered Users Posts: 105 ✭✭
Instead of soldering hundreds of 18650 cells, prismatic cells are used. Priced incredibly right. ALL prismatics are made in China as are ALL lithium batteries. Can anyone tell me if the Battle Born batteries are 18650 packs or prismatics?
I was convinced about what direction I would go with batteries until I saw these. Now I've forgotten about those in favor of packs made with prismatics. Now I wouldn't use anything else.
Hoping eventually to have four.
How about you?

Comments

  • jonrjonr Solar Expert Posts: 1,187 ✭✭✭✭
    edited December 2018 #2
    Be careful with no-name stuff from China.  And shipping charges.   Also add an external BMS if you put more than one of these in series.
  • AmpsterAmpster Registered Users Posts: 80 ✭✭
    edited December 2018 #3
    I dove deeper into the site and after seeing the construction I would rather assemble a 48 volt pack from their prismatics using my own BMS. Of course that assumes I could get some assurance about the life expectancy of those cells. Overall the cost per kWh could be competitive depending on shipping.
  • OldManOldMan Registered Users Posts: 105 ✭✭
    Ampster said:
    I dove deeper into the site and after seeing the construction I would rather assemble a 48 volt pack from their prismatics using my own BMS. Of course that assumes I could get some assurance about the life expectancy of those cells. Overall the cost per kWh could be competitive depending on shipping.
    I had one shipping quote at $60 per pack.
  • OldManOldMan Registered Users Posts: 105 ✭✭
    edited December 2018 #5
    jonr said:
    Be careful with no-name stuff from China.  And shipping charges.   Also add an external BMS if you put more than one of these in series.
    Are you saying the BMS in the units are somehow defective? If you want a BMS display on the battery, ask for it.
    That said, Electric car batteries in Utah has a wonderful,  inexpensive BMS chip.

  • mcgivormcgivor Solar Expert Posts: 2,486 ✭✭✭✭✭
    OldMan said:
    Instead of soldering hundreds of 18650 cells, prismatic cells are used. Priced incredibly right. ALL prismatics are made in China as are ALL lithium batteries. Can anyone tell me if the Battle Born batteries are 18650 packs or prismatics?
    I was convinced about what direction I would go with batteries until I saw these. Now I've forgotten about those in favor of packs made with prismatics. Now I wouldn't use anything else.
    Hoping eventually to have four.
    How about you?



    These pre assembled batteries cannot be used in series to achieve a higher nominal voltage, due to internal BMS, parallel is possible, so if your system is 12V no problem.  There are pre assembled batteries at higher nominal voltages available from some manufacturers, convenient for those who don't want to build their own, however being sealed there is no access to individual cells to check cell voltage for ballance.

    Battle Born are made up of smaller cells, they confirmed that in reply to a query I made, there are pros and cons to each configuration, however for solar application prysmatic are better suited, especially in a DIY bank, IMHO.

    Price wise $360 is the single piece price, always haggle with them before ordering, it's the Chinese way, you may save a little, my negotiations resulted in the equivalent of shipping costs. For comparison my individual 100Ah cells were $65 so a DIY 12V 100Ah would be $260 add BMS plus wiring etc. the price is about the same, scaled up in voltage and capacity not as close.

    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery bank 
    900W  3 × 300W No name brand Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah FLA 24V nominal as a backup system. 
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergencies and welding.
  • jonrjonr Solar Expert Posts: 1,187 ✭✭✭✭
    > Are you saying the BMS in the units are somehow defective?

    Not defective, just not designed to create > 12V batteries.
  • OldManOldMan Registered Users Posts: 105 ✭✭
    jonr said:
    > Are you saying the BMS in the units are somehow defective?

    Not defective, just not designed to create > 12V batteries.
    12v is ok with me.
  • AmpsterAmpster Registered Users Posts: 80 ✭✭
    mcgivor said:
    ........... For comparison my individual 100Ah cells were $65 so a DIY 12V 100Ah would be $260 add BMS plus wiring etc. the price is about the same, scaled up in voltage and capacity not as close.

    That is $260 for 1200 Watts or $216 per kWh. Is that a USA price for local pickup? I have a BMS so that number works for my future expansion plans. 

  • mcgivormcgivor Solar Expert Posts: 2,486 ✭✭✭✭✭
    Ampster said:
    mcgivor said:
    ........... For comparison my individual 100Ah cells were $65 so a DIY 12V 100Ah would be $260 add BMS plus wiring etc. the price is about the same, scaled up in voltage and capacity not as close.

    That is $260 for 1200 Watts or $216 per kWh. Is that a USA price for local pickup? I have a BMS so that number works for my future expansion plans. 

    The price is FOB, shipping charges were $250 for 32×100Ah cells to Thailand, no import duties or tax on batteries here, vendors will provide shipping costs.  
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery bank 
    900W  3 × 300W No name brand Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah FLA 24V nominal as a backup system. 
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergencies and welding.
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