DIY Grid Reconditioning Charger

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Abarnabe, Sep 13, 2020.

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  1. Abarnabe

    Abarnabe Member

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    You may find the instructions here Gen 3 HV cooling fan motor: wiring diagram? | PriusChat
     
    #61 Abarnabe, Jun 4, 2021
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  2. alltherightpills

    alltherightpills Junior Member

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    Thanks, that's good info - now I know exactly where to apply my 12V for the fan.

    Is that 4 pin connector a standard part? Hoping to buy the female end to keep the wiring super simple.
     
    #62 alltherightpills, Jun 7, 2021
  3. zeno

    zeno New Member

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    Hello guys,
    Regarding prius g2 battery reconditioning... maybe you can make me understand:
    if you follow the Prolong instrunctions for descharging and if you use a grid charger, you should descharge the entire 28 modules battery to 134/101/84V, meaning 4.8V/3.6V/3V per module (0.8V/0.6V/0.5V per Cell).
    If you are discharging individual modules with kind of iMax, the disch voltage should be 6V per module, meaning 1V per Cell.
    Some posts says that you should never discharge a NiMh cell under 0.8V.
    Can you please advice which is correct?
    Many thanks
     
    #63 zeno, Nov 28, 2021
  4. Abarnabe

    Abarnabe Member

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    Discharging below 1 volt is possible, it's risky , but it's necessary for reconditioning, it should be done at very low current and only according to prolong directions, in order to minimize the risk of polarity inversion. If discharged below 1v at higher current, there is a risk of polarity inversion and the cell will die.
     
    #64 Abarnabe, Dec 4, 2021
    Last edited: Dec 4, 2021
  5. zeno

    zeno New Member

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    Thx a lot!
     
    #65 zeno, Dec 4, 2021
  6. mjoo

    mjoo Senior Member

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    A single NiMh cell can be discharged down to zero volts. At that low voltage it can break up the crystals (memory) that lower capacity.

    The problem with a Toyota hybrid is that you're discharging all 168 cells and as they age they all have different capacities. Discharging the high capacity cells to low voltages can over discharge the low capacity cells.

    Below is what happened when I ran the discharger at the 17 volt setting. Bank #5 (with 12 NiMh cells) fell below 2 volts. I was watching it on my phone and stopped the discharger when bank #5 dropped below two volts. After I stopped the discharger bank #5 bounced back to 12.9 (1.1V per cell). I would be concerned if the bank #5 voltage ended up being less than 12V.

    Screenshot_20211129-204820.jpg Screenshot_20211129-193410.jpg

    moto g power ?
     
    #66 mjoo, Dec 4, 2021
    Last edited: Dec 4, 2021
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  7. Abarnabe

    Abarnabe Member

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    Before and after last reconditioning, this time the balancing voltage ended at 245v
     

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    #67 Abarnabe, Dec 21, 2021
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  8. Abarnabe

    Abarnabe Member

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    Latest developments:

    - 3D printed housing containing
    12 v 12A fan power supply, 250v 350ma grid charger and a meter.

    - 4 poles harness with fuse, 12v dc , 250v dc.

    When I charge I disconnect the original fan plug and I connect another one PN (6520- 0349) coming from the new grid charger.
     

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    #68 Abarnabe, Sep 23, 2023
    Last edited: Sep 23, 2023
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  9. Abarnabe

    Abarnabe Member

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    and the box
     

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    #69 Abarnabe, Sep 23, 2023
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  10. Fury6z

    Fury6z New Member

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    Hey Abarnabe,

    I'm in France and want to build your grid charger – got any electrical schematics you'd suggest?
     
    #70 Fury6z, Feb 11, 2025 at 7:09 PM
  11. Abarnabe

    Abarnabe Member

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    #71 Abarnabe, Feb 12, 2025 at 3:09 PM
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  12. Fury6z

    Fury6z New Member

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    #72 Fury6z, Feb 13, 2025 at 5:49 AM
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