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Dual Charger

Discussion in 'Want to Buy' started by LEKTRON, Sep 3, 2016.

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  1. LEKTRON

    LEKTRON Member

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    looking for model s onboard dual charger
     
  2. deonb

    deonb Active Member

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  3. LEKTRON

    LEKTRON Member

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    Thanks....I'm looking to save some money if someone is selling the part ;)
     
  4. bart513

    bart513 Member

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    As an FYI I looked into it and found someone willing to sell. The problem is that Tesla won't warranty the part or anything that goes wrong with it if you didn't buy it from them.
     
  5. bkp_duke

    bkp_duke Member

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    Installation is not a simple "plug and play". There is significant programming required and this can only be done 99.99% of the time by Tesla (a few here could do it, but I would not expect them to share the secret sauce).
     
  6. LEKTRON

    LEKTRON Member

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    Thought I would have Tesla do the actual installation....do you think they would balk at installing a used part??
     
  7. bart513

    bart513 Member

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    Yes but call to make sure
     
  8. bkp_duke

    bkp_duke Member

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    Yeah, they won't touch it, no warranty, etc.

    FWIW, the $2000 includes installation at the service center, and most of the "slave" chargers I have seen go for $1200-1400. So that $600 difference is worth the warranty and piece of mind it is programmed in correctly.

    Also, as a few people in other threads have pointed out, if you are paying for electricity, you will lose some efficiency at higher charging rates. Once the battery starts to get hot from charging it will ramp up the cooling system, which will bleed off some power.

    I have a single charger Model S and my wife has a dual charger Model S. We usually charge both cars at 30-40A to minimize efficiency losses, unless we are in a hurry with her car and then we will crank it up.
     
  9. LEKTRON

    LEKTRON Member

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    Thanks for the info! This makes a great deal of sense. My need is not for home charging but one particular stretch I do between the supercharger in winnemuca NV and boise: requires a "top off" half way at a casino with a 80A charger, and one hour versus two would be significant.

    I appreciate the info, I'll save up and go with new.....
     
  10. bkp_duke

    bkp_duke Member

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    Yeah, the value of your time would certainly add up in that case.
     
  11. Ingineer

    Ingineer Electrical Engineer

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    Yes, you cannot just throw a second one in there. The charger itself has to be programmed for slave operation (unless it was already), and then the car has to be told to use it, otherwise it will not. Then, you also have to flash the firmware.

    In addition, the installation involves breaking into the glycol coolant lines, so it's messy and requires a coolant bleed afterwards.

    I've done it and unless you REALLY have a specific need for higher power, it's not really worth it.

    If you are really set on one, I can assist with the installation, but I can say from experience; not worth it as you have to carry it around all the time from then on, while most of the time it's not really used/needed.

    Somewhat OT, but I'm working on a project that's basically a "mini" supercharger. It will use 3 charger modules and be capable of up to 36kW. I will install this at my shop where we have 3-phase power and then on the rare instances where a quick top-off is needed, we can use that rather than carrying around the extra weight of the 2nd charger in our cars.
     
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  12. agw

    agw Member

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    Are you planning to feed DC to the car out of the three charger modules? With which protocol?
     
  13. Ingineer

    Ingineer Electrical Engineer

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    It's just like a normal SpC does it, albeit with only 3 chargers instead of 12. It will use the same protocol.

    It'll actually be like when you pull into a shared pair of stalls and someone is already charging on one. You'll get one set of 3, because they are using the other 9.
     
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