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Tesla car battery to power my house

Discussion in 'The UK and Ireland' started by IanMcL, Jan 24, 2019.

  1. IanMcL

    IanMcL Member

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    No answers, only question!

    If I buy an inverter, can I use the power in my Model S to power my house at night?

    If yes...how do you get the power from car through inverter, to house use?

    Seems like a good wheeze!
     
  2. mongo

    mongo Well-Known Member

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    No, you cannot (easily).
    Yes, you can, if you bypass the safety systems, tap into the HV lines and find a 300-400V DC input inverter. (And void your warranty)
     
    • Like x 1
  3. kavyboy

    kavyboy Member

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    Do a search (here or on google, etc.) using for "V2G", or "vehicle to grid". That'll get you the info you need. And @mongo is correct. Tesla would rather sell you a powerwall than have you use your vehicle, especially if you're filling up at a supercharger.
     
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  4. SongjinDK

    SongjinDK Member

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    You can use a 12V inverter connect to the battery post in the frunk. The DC-DC converter is rated 2.5kw. You can power the lights, TV, computers, maybe even the fridge, but not the AC etc. For latest models the battery post is directly connected to the 12 battery and connected to the DC-DC converter through a 250A fuse.
     
  5. IanMcL

    IanMcL Member

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    Dc-Dc or DC to AC?
    Where do you connect to the house?
     
  6. SongjinDK

    SongjinDK Member

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    Tesla has a DC-DC converter converts 400V DC to 12V to charge the 12V battery and supply power for 12V system. You need to buy a 12V power inverter to convert 12V DC to 110V or 220 AC. Here is a good video:


    You can buy a bigger one (1500w or 2000w), but I would be cautious to draw too much power from Telsa. You can connect the AC output from the power inverter to one of your wall outlets in the garage to power your house. Make sure you disconnect the grid first.
     
    • Disagree x 2
  7. mongo

    mongo Well-Known Member

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    Don't suggest suicide cords or setups that can backfeed the grid. A 12V inverter is not going to be able to start/ run household appliances. Back feeding though a 15 or 20 amp circuit is asking for trouble like only partly feed the 240 loads.
     
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  8. SongjinDK

    SongjinDK Member

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    Need to make sure not to turn on large appliances or ACs, etc. just the lights (use LED), internet, TVs and computers, etc. which should not be more than 1kw, so 15 or 20 amp should be enough.If you need to run fridge, you need to turn off other ones to make sure total power is within the limit. Also the 20amp circuit breaker can protect the inverter/Tesla.
     
  9. IanMcL

    IanMcL Member

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    Sounds a bit iffy!
    Thanks for the info and detail. Appreciated.
     
  10. .jg.

    .jg. Member

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    • Like x 2
  11. wycolo

    wycolo Active Member

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    Tesla knows you are sucking power out of your Model_ in your *own driveway*. This is not a good idea.
    --
     
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  12. IanMcL

    IanMcL Member

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    Thanks all.
     
  13. Peteski

    Peteski Active Member

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    Why would you want to power your house from your car battery?
     
  14. mswlogo

    mswlogo Active Member

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    Because it could be a back up or act as a power wall when not in use.
    Kind of shame you can't.

    It is explicitly stated somewhere in Tesla docs to not do this.
     
  15. mswlogo

    mswlogo Active Member

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    Vampire Drain ;)
     
  16. IanMcL

    IanMcL Member

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    Free power source, acting like a powerwall, as described above. I have a free charger, just a 14 min walk away. It would complement my solar panels, in winter and at night.
     
  17. EVDRVN

    EVDRVN Member

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    Using the 12V to power an inverter is only a good solution in an emergency. Trying to do this as a power wall or any other application is a very bad idea and hugely inefficient. There is no way to run an inverter off the pack for many reasons so don't go there. A MUCH better and safer option is to buy a Honda inverter generator and possibly a propane conversion kit or a Power Wall if you are looking for the power shift benefits. This is a dead horse that gets beaten to a pulp on every EV forum for years and ends up with the same result.
     
  18. EVDRVN

    EVDRVN Member

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    I'm sure other EV drivers and the provider would love that idea and so would you pack.
     
  19. mswlogo

    mswlogo Active Member

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    Didn't I say Tesla say's that it's a no no?

    But technically, there is no reason it couldn't have been designed to have the hooks to do so (which are not there to do it efficiently or safely now). What the cost benefit would be I'm not sure. I think it could make better usage of the batteries. Some people have Powerwalls for backup. Some have Tesla's for Weekend/Summer cars. So that battery resource could fulfill more purpose in it's life span. Albeit not as perfectly as a dedicated powerwall. It could also expand capacity to an existing powerwall. It's just the same big battery that's in a Powerwall.

    Are you saying the cells are organized differently in a Powerwall battery? Optimized for efficient 240VAC conversion?

    12V inverter would be useless.
     
  20. mongo

    mongo Well-Known Member

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    Powerwall cells are NMC whereas vehicle cells are NCA.
     

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