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Is It Possible To Overcharge The Traction Battery Via Plug-In Mode?

Discussion in 'Prime Main Forum (2017-2022)' started by MaggieBlue, Dec 13, 2017.

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  1. MaggieBlue

    MaggieBlue New Member

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    Prime Plus
    We have had our 2017 Prius Prime for two weeks. Thus far, we love the car. We mostly run local errands (< 25 miles round-trip) and recharge via plug-in mode (120 volts). We frequently check the charging status, and when the car has reached full charge we disconnect the charging cable before bedtime.

    Several questions: What would happen if we left the charging cable attached all night and the car reached full charge several hours before we detached the charging cable? Would this cause any damage? If done once? If done repeatedly?

    Another question: What is the basis for the precaution against using an extension cord with the charging cable?

    Than you.

    MaggieBlue
     
    #1 MaggieBlue, Dec 13, 2017
    Last edited: Dec 13, 2017
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  2. huskers

    huskers Senior Member

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    No problem with leaving it plugged in. The car will turn it off when ready.

    Extension cords may not pull electricity correctly. They can be used but need to be heavy duty cords. Best not to use them unless a last resort.
     
    #2 huskers, Dec 13, 2017
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  3. David Beale

    David Beale Senior Member

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    The problem with using an extension cord is if it isn't at least 14 gauge there will too much voltage drop in it. This makes the charger draw higher current, which can cause overheating. If you have to use an extension cord get one that is 12 gauge and no longer than 50 feet. This would give you similar voltage drop to a properly wired outlet. If you have to, a 12 gauge 100 ft cord can be used, but be sure with any of them to get a good quality one. The ends can also cause voltage drop on poor quality cords. Remember, you are not powering just a light bulb, the Prius is a medium to heavy current draw, and the cord must be chosen accordingly.
     
    #3 David Beale, Dec 14, 2017
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  4. PT Guy

    PT Guy Senior Member

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    Maggie, you'll see that the charging cable connector has five pins. Two are for the electric power. Two others are for communication signals between the charger in the car and the power supply in the lump in the cable. The 5th is a proximity pin that tells the system when the connector is plugged in or pulled out.

    The system is smart. The parts communicate and automatically do what you've been doing manually. Leave it plugged in and sleep well.
     
    #4 PT Guy, Dec 14, 2017
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