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Model S as a power source for home outages like we're seeing during Hurricane Sandy??

Discussion in 'Model S' started by teslasguy, Nov 1, 2012.

  1. teslasguy

    teslasguy MSP P#1117

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    For all of us that have been living through Hurrican Sandy for the past few days, it sure would be nice to hook up an inverter to our Model S to at least power the fridge, freezer and a few lights during times like this. Since the S is all electric we could actually use it as a good power source while in the garage without worring about carbon monoxide. Any thoughts as to how to do this? I know that the 12V outlets aren't powerful enough but I'd love to hear any thoughts from others on this, including feedback from Tesla. This would be a huge benefit for those of us that go through times like this.
     
  2. widodh

    widodh Model S R231 EU

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    It has been confirmed already by Tesla, Model S will not be able to do Vehicle2Grid.

    So no, this won't work. You should buy a Leaf or Prius Plugin for that.
     
  3. Babylonfive

    Babylonfive Power12

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    You'd need access to the batteries themselves and you'd have to provide an external inverter (back up to 240 split-phase, actually two coupled inverters in some solutions). These already exist for off-grid solar/wind systems, so the tech is there.

    What really doesn't exist is a way to tap the batteries, and Tesla would have to somehow approve and manage that connection. Otherwise, the software would misinterpret the drain as a failure of sorts. Big picture: it exceeds the scope of the current Tesla design.

    I love the idea, and it's similar to existing ideas espoused by power companies for on-grid storage supplying peak power for the grid. This would use exactly the same equipment an off-grid solution would use, but would drive right through to the grid. The right mixed-mode inverter/batterycharger/solar system would provide very interesting on- and off-grid modes, but alas, Tesla didn't integrate anything that I know of into their design to accomplish this; further, the way they are insulating and battery subsystem with their own chargers, I'd guess they would be very careful on the external access for discharge.

    Just my $.02.
     
  4. efusco

    efusco Moderator - Model S & X forums

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    Any idea what capacity inverter the 12v would be able to handle?
     
  5. Babylonfive

    Babylonfive Power12

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    Depends on how you hook it up. The 12V accessory battery could supply a lot of current for a short time for an inverter, but I'm not clear on what the recharging rules are from the main pack to the acc battery... it's been discussed in another thread. There was even a recent sowtware update i think that modified how it worked and how it reported a bad external battery.

    The Tesla 12V internal outlet is supposed to be much more limited: 300 watts? I've forgotten where I saw that and a cursory search didn't hit.
     
  6. RDoc

    RDoc S85D

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    Personally, having an emergency generator, I'm more interested in if the car charger will accept the somewhat dirty power it creates.
     
  7. Babylonfive

    Babylonfive Power12

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    Search the forum, as there already is a a thread and/or discussion about this.
     
  8. daxz

    daxz Member

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    Here's applicable reference from Roadster's power systems: (12V*25A = 300w)?

     
  9. ToddRLockwood

    ToddRLockwood Active Member

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    There is specific language in the Model S warranty that forbids using the car as a power source. In other words, you'll void the warranty.
     
  10. efusco

    efusco Moderator - Model S & X forums

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    That's pretty standard, nobody's gonna say it's OK....too easy to do it wrong. That doesn't mean it can't be done and safely, and without it being detectable.
     
  11. strider

    strider Active Member

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    At least w/ the Roadster, Tesla forbids the use of a 12V inverter. One person used one and caused some damage to the car's systems.
    The prevailing thought is that a generator w/ an inverter will work just fine. I was able to charge my Roadster from my Inverter-equipped Honda generator.
     

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