Charging Cable Extension

Discussion in 'Prime Plug-in Charging' started by Chris Martin, Aug 20, 2019.

  1. Chris Martin

    Chris Martin New Member

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    Good afternoon all.

    This may have been discussed before, but my plugs are not in the most convenient location in relation to my driveway. When charging, I have to shuffle the cars around in the driveway and put the Prius in first. In morning, I have to move all of the cars again to get the Prius out. Inconvenient in the morning.

    What has been your experience with an extension? I have seen some on Amazon, but I'm not sure of the issues, current loss, etc. Here's one:



    Is this an option? I could use twenty extra feet and not have to move all of the cars just to charge. Any advice would be greatly appreciated.
     
  2. Salamander_King

    Salamander_King Senior Member

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    You don't need expensive 40 Amp, 20ft, J1772 Extension Cable. All you need is heavy duty regular 120v extension cord of 12AWG or 10AWG. If the brick part of the EVSE is going to be outside, you might want to invest in weatherproof box to place the connection part. Something similar to the photo below.

    extention cord.png
     
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  3. fuzzy1

    fuzzy1 Senior Member

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    And get the shortest cord that works, e.g. just 25 feet instead of 50 or 100. The shorter the cord of a given gauge, the less the voltage drop.
     
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  4. Rob43

    Rob43 Senior Member

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    Yep, I agree with what's been said above.

    Personally I like 10 AWG, it will have very little (almost none) loss at 25 ft.

    Another thing you may or may not know is that you can use your 120v OE Toyota EVSE unit at 240 volts to charge your car in less than half the time, typical full charge time is 2 1/2 hours on 240 volts. If you have any questions, let me know.


    Rob43
     
  5. bisco

    bisco cookie crumbler

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    its the plugs that get hot. get a good quality
     
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  6. hill

    hill High Fiber Member

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    that's right .... & THAT'S why the most expensive way is the best way. It's called future-proofing. Someday you may need to charge somewhere above a paltry 3.6 kw's;

    JLONG - 20 foot J1772 extension cable

    [​IMG]

    When that day comes, & you are charging on 240V - 30amps, & you still have a long run, you'll be glad you went this route.
    But if you think you'll be stuck on 120v forever? Then sure, go for a extension cord.
    .
     
    #6 hill, Aug 20, 2019
    Last edited: Aug 20, 2019
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  7. Chris Martin

    Chris Martin New Member

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    That's great. Do you just put a 240v adapter on?Unfortunately, I only have a 240v in my washroom. I'm really not concerned with charging speed because I charge overnight.

    What I wish was I had 2 or 3 times the battery capacity! Then I'd never use the ICE again.
     
  8. Rob43

    Rob43 Senior Member

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    Yep, bigger capacity would be great !

    Yes, you just put an adapter on your EVSE unit.

    I make these adapters all the time for people using the best materials:
    Using the Primes 120v Charger at 240 Volts, Cost $20 !!! | Page 6 | PriusChat


    Rob43
     
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  9. hill

    hill High Fiber Member

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    240 is around 10% more efficient than 120v.
     
  10. fuzzy1

    fuzzy1 Senior Member

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    While future-proofing may be a good idea, it may not work out as cost effective if done prematurely. Prices fall with volume, standards change, sometimes the future goes a different path. So $200 for this cord, vs $25-30 for a 120V 12AWG extension (or $35-40 for a 10AWG extension), I'd go with the common 120V extension for now. Wait until a future car with bigger battery comes along before getting that J1772 extension, along with a 240V outlet in the garage.

    Also:
    If something seems to be getting hot, or the EVSE and car get finicky with an extension cord, you might be running into the reasons Toyota discourages extensions in the first place. If so, you can buy some margin by reducing the charging rate from the original default 12 Amps (on 120V, more on 240V) to just 8 amps. (For how to, see owner's manual.) This will cut the parasitic cord and plug heating in half, and cut the voltage loss (in the house branch wiring too, not just in the extension cord) by 1/3rd. If you are charging over night, the longer charge time will not be an issue.
     
  11. john1701a

    john1701a Prius Guru

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    Of course, that could result in missed opportunity. Electric providers may not be offering rebates then. We got $500 for each line setup. No harm checking what's available now.
     
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  12. Chris Martin

    Chris Martin New Member

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    Last night I purchased a 25' extension, and everything went smoothly. No real heat at the plug in the wall, the connection to the charger nor the line transformer. Had a full charge.

    I presume no issues.
     
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  13. hill

    hill High Fiber Member

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    it looks like the OP was hoping to charge 240V, ergo, the 240V solution. Equally important, if you're out and about, needing a charge, it's all too common that some moron will ice public charging spots. A 240v J1772 extension, will let you work around such shenanigans. That's especially important for an EV, as opposed to a phev.
    Pricey? For some, sure. Extended car warranties are expensive too. Homeowners insurance is pricey too. It's crucial though, in times of Dire Straits. Everybody has to assess their own risk vs benefit.

    .
     
  14. Chris Martin

    Chris Martin New Member

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    I want to rant today about charging stations.

    This morning, two ICE SUVs in EV Class2 spaces and a Tesla owner pulls in and doesn't plug in. I guess Tesla charging spaces double as lazy Tesla owner spaces.
     

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  15. noonm

    noonm Active Member

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    Call the lot owner and ask them to ticket/tow the non-EVs.

    For the Tesla, I'd put one of these notes on the windshield:
    [​IMG]
     
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  16. hill

    hill High Fiber Member

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    Just as people park cars in the wrong spot ...... PC members park their rants about such things in the wrong spot

    Plug-In Parking Abuse Hall of Shame: Post Pic's Here | PriusChat
    .
     
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  17. Gaëtan Lafrance

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    Bonjour,

    I use 15 metres extension 10AWG and it's ok.
     
  18. Chris Martin

    Chris Martin New Member

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    Sufficiently reprimanded
     
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  19. mveras1972

    mveras1972 Member

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    Until recently I was using two 15A orange extension cords and they got warm around the plugs during charging. They are both 14AWG. One of the extensions got cut in the past when I was trimming some bushes one day and I patched together as seen in the picture. I soldered the wires together to repair it. I monitored this particular spot and never noticed any warming when charging the Prius. The point is, it all depends how good the connection is. Good connections will prevent warming.

    IMG_2448.jpg
     
    #19 mveras1972, Sep 1, 2019
    Last edited: Sep 1, 2019
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  20. bisco

    bisco cookie crumbler

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    absolutely. that's why a lot of people recommend the screw terminals on a wall outlet, instead of the push in connections.

    well done! (y)
     
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