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Featured Prius III On board charging system

Discussion in 'Gen 3 Prius Accessories and Modifications' started by aaronsbd, Aug 7, 2018.

  1. aaronsbd

    aaronsbd New Member

    Joined:
    Aug 7, 2018
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    Location:
    08200, Sabadell
    Vehicle:
    2010 Prius
    Model:
    III
    I’d like to share with you my future project, which is a portable battery, that connects in parallel with the hybrid system of a Prius HEV and transforms it in a plug-in hybrid without plug.


    Here is a list of the parts I believe are the best appropiate:


    Battery: 48v 40Ah / 80 Ah. Since I start cheap. I’ll go with 40Ah:


    High voltage EV Relay, activated by a switch in the dashboard: Avoids high voltage exposure when unplugging the battery and when the car is powered off.


    Inverter 48vDC to 240VAC 2500W: since there are no DC boost converters on the market with this requirements I believe an inverter will do.


    5A 288v Charger


    Circuit is as follows:

    Battery is charged at home, brought to the car and hooked to the inverter. Inverter connected to the 288v charger and charger connected to the terminals of the Prius battery pack through HV relay and controlled through a switch in the dashboard

    This project will be applied in a Toyota Prius Gen3 and the purpose of this thread is to know your thoughts, pros and cons and difficulties I may encounter when I’ll assemble the whole thing, especially in the boost conversion part, where I have the biggest doubts.


    I will highly appreciate your comments and help.

    Thanks a lot and look forward to hear what you think.

    Aaron.
     
    #1 aaronsbd, Aug 7, 2018
    Burna J likes this.
  2. Grit

    Grit Senior Member

    Joined:
    Aug 22, 2017
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    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    Great idea, I may follow suit if checks out.
     
    #2 Grit, Aug 7, 2018
  3. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
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    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    welcome!

    there have been a lot of failures in this arena, but one fella from france has done great things.
    i had to buy a premade plug in.

    all the best!(y)
     
    #3 bisco, Aug 7, 2018
    aaronsbd likes this.
  4. aaronsbd

    aaronsbd New Member

    Joined:
    Aug 7, 2018
    4
    1
    0
    Location:
    08200, Sabadell
    Vehicle:
    2010 Prius
    Model:
    III
    Thanks Bisco, Is his job shared anywhere I can check?
     
    #4 aaronsbd, Aug 8, 2018
  5. aaronsbd

    aaronsbd New Member

    Joined:
    Aug 7, 2018
    4
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    0
    Location:
    08200, Sabadell
    Vehicle:
    2010 Prius
    Model:
    III
    Does anyobody knows if the 288v charger may cause any damage to the Battery's 240 max rated voltage?
     
    #5 aaronsbd, Aug 8, 2018
  6. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
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    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    if you look at gen 2 mod forum on the main forums page, there is a plug in sub forum link just below it.
    scroll down the page and you will see a thread by member 'planetaire'.
     
    #6 bisco, Aug 8, 2018
  7. Maarten28

    Maarten28 Active Member

    Joined:
    Jul 13, 2014
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    Location:
    Netherlands
    Vehicle:
    2011 Prius
    Model:
    Three
    I have no idea, but it is likely that it won't put 288V on the battery at once. When you try to charge a lead battery, it is no problem to use a 30V DC power supply because the battery voltage will slowly rise from wherever you start (11V or so) . You can always cut the power when the voltage gets too high.
    Not really sure how this works with NiMH batteries though.

    Also keep in mind that at 80% SOC, the battery is at 269V. If the relation between SOC and battery voltage is linear, than 288V would be 86,4% SOC. That's outside of the limits the Prius will let the battery go, but I would not put that so far outside of the limits that it would damage the battery. A battery at that SOC will probably be forcefully depleted by running the petrol engine.

    BTW: the official spec is 28x8.4V = 235.2V

    Disclaimer: This is all just reasoning. I have no deep knowledge of the Prius battery system.
     
    #7 Maarten28, Aug 9, 2018
    Last edited: Aug 9, 2018
    bisco likes this.
  8. aaronsbd

    aaronsbd New Member

    Joined:
    Aug 7, 2018
    4
    1
    0
    Location:
    08200, Sabadell
    Vehicle:
    2010 Prius
    Model:
    III
    Thanks Marteen, I finally choose a 250VDC adjustable PS.

    I'll let you know how it works
     
    #8 aaronsbd, Aug 16, 2018
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