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240v Electrical Question

Discussion in 'Model 3' started by lupend88, Apr 22, 2018.

  1. cybergates

    cybergates Member

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    i'm doing the same thing essentially. The 10-30 relocated to the garage converted to 14-30 as the ground wire was actually there just never hooked up and tested ok with a multimeter. I have that same extension just 15 feet as that what I needed - its really well built and I went w 14-50 so I can use it anywhere such as an RV park if ever needed with adapters on either end. You can actually cut the neutral prong so the 14-30 tesla adapter plug will fit into the 14-50 cord which is what I did yet the tesla branded adapter keeps the Amps at 24 Amps which is safe (search for others posting about that here if you wish, o/w I had adapters on both ends now just this one: https://www.amazon.com/gp/product/B00STD8CXC/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
     
  2. RayK

    RayK Active Member

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    I'd really like to see that setup!
     
    • Funny x 2
  3. scaesare

    scaesare Well-Known Member

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    Oof. Too late to edit my typo.
     
  4. xav-

    xav- Active Member

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    Thanks for the details. By the way my numbers are not just my numbers they are also on teslas website. So 27 percent waste is a very big deal and charging using a standard outlet should be used only when there isn’t any alternative IMO
     
  5. xav-

    xav- Active Member

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    It’s like $90 on Amazon for 25 foot (Nema 10-30 or Nema 14-30)
     
  6. voip-ninja

    voip-ninja Give me some sugar baby

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    If 25' works then sure.

    Even if my dryer was in my garage 25' would not be long enough to reach.
     
  7. CricTic

    CricTic Member

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    Haven't seen this mentioned yet, but I think there is a box you can get that plugs into the dryer outlet and gives you two outlets with one given priority. So if you give the dryer the priority outlet (assuming you have an electrical dryer), the EV won't get any power whenever the dryer is running. This avoids tripping the breaker, but allows you to keep everything connected all the time. I think it's called Dryer Buddy??

    I have no personal experience with one but imagine it would solve problems for a few people here.
     
  8. diamond.g

    diamond.g Active Member

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    Are you leaving the extension cord at the vacation house? I wonder if it would be better to get the 10-30 adapter from Tesla and a 10-30 extension cord, that way you (or anyone else driving and charging in that location) don't have to worry about turning down the Amps when plugging in.
     
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  9. dhrivnak

    dhrivnak Active Member

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    #29 dhrivnak, Apr 24, 2018
    Last edited: Apr 24, 2018
    48E4ECBE-6363-4E05-8DAF-34EF9EE6535A.png
    Well my test is not as clear as I get 5 miles/hr on 120v and 11 with 240v at 12 amps and 22 miles/hr at 24 amps. So I am not seeing much difference and if that 5 were really 5.5 miles per hour there is no difference.
    11DA136B-84A0-437A-99E4-5BCF56010CE2.png 5872376F-2395-4A28-9079-16497D9F3D19.png
     

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  10. mongo

    mongo Well-Known Member

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    4:05 vs 1:50 charge time -> 245 vs 110 minutes 2.23 times longer (ignoring 3 minute time difference/ potential charge) 248 V vs 117 V (12A each)-> 2.12 times the input power. 248 charging is 5% faster per kW in. Works out to a base load of ~123 W.
     
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  11. RyanS

    RyanS Ka-chow

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    If you are going to own your M3 for a few years, I would spend money and get the right outlet. 120V is just not enough, especially for Tesla.
    Other option is to use free public charger to charge.
     
  12. wws

    wws Member

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  13. PoitNarf

    PoitNarf My dog's breath smells like dog food

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    Nope, keeping the cord with me. That’s why I’m getting a 14-50 cord with an adapter so I have more options to use it in other locations if necessary. It’s my father’s house so I’d need to clear it with him first, but I would love to install a NEMA 14-50 in the garage at some point.
     
  14. deonb

    deonb Supporting Member

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    It really isn't such a big deal. If 120V is sufficient for your driving, you can't really waste enough electricity for it to be a big deal.

    Let's say you charge at 120V 12A = 1.44kW. And you charge 12 hours per day weekdays/20 hours per day weekends - so you charge 100 hours per week.

    100 hours per week x 1.44kW x 52 weeks @ 10c / kWh = $748 per year total in electrical charges. Take 27% of that as waste = $200/year.


    If it would cost $3k to install a 240V outlet like it was quoted for fluxemag - it would take your 15 years to recover that - and... do you even know if you're going to be in the same place in 15 years?

    Even if installation is only $1000, but you're in an apartment, it's only really worth installing if you know that you'll still be there in 5 years.
     
  15. LectrikPower

    LectrikPower Member

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    What is the max amps the three can take? I'm about to get 240v put in the garage. Trying to figure out if I should go 60 or 80amps. I plan on having two EV's in the future and will put in chargers for both to split the line

    I think I should be good with 60 (25amps a piece) but why not go 80 if I can. Thoughts?
     
  16. RayK

    RayK Active Member

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    According to the horse's mouth, 48 amps is the minimum required to get the maximum charge rate. That means a 60 amp breaker.

    Home Charging Installation

    Not sure if you can install two separate 60 amp breakers and expect both of them to be active (and pulling max amps) at the same time. You better have at least a 200 amp service panel and the wiring from the curb/pole to handle that.
     
  17. LectrikPower

    LectrikPower Member

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    Thank you sir! Thought I had that page bookmarked. I do now:)
     
  18. Mod3l 3

    Mod3l 3 Member

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    Any 14-50 outlet recommendations?
     
  19. brkaus

    brkaus Well-Known Member

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  20. xav-

    xav- Active Member

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    Interesting! My numbers matched teslas numbers so I thought they were realistic. I should also add that I used a 25 foot extension cord with 240v but no extension cord with 120v

    The other interesting figure is that you pull 249 volts but I pull 234 volts. Yet we both get 22 miles of range.
     

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