TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC

anyone know a good auto electrician in Syd / NSW for model x battery hacks?

Discussion in 'Australia & New Zealand' started by bob_bear, Mar 4, 2018.

  1. bob_bear

    bob_bear Member

    Joined:
    Sep 27, 2017
    Messages:
    12
    Location:
    wollongong, australia
    Hi team,

    i'm keen on looking at options to access the 100kw battery on my model x p100d, would be a great source of power for camping trips etc.

    Can anyone recommend an auto electrician in NSW that might be able to help me with this? Even better if anyone has already done it and might be able to share their approach.

    I can currently access the 12V battery in the frunk but i haven't been game enough to draw a big load through it, merely 300W inverter.

    Cheers,

    Rob from Wollongong
     
  2. eclectricdave

    eclectricdave Member

    Joined:
    Feb 24, 2016
    Messages:
    271
    Location:
    Malbourne Australia
    No warranty on battery if you connect external loads. BTW it is beyond auto sparky. Youd need to consult with an engineer or A grade Sparky- the Voltages are too high. Stick to 12V or connect 12V to 240V inverter. The built- in DC-DC converter will supply your loads.This is at least 100A at 12V rating.
     
    • Like x 1
    • Love x 1
  3. bob_bear

    bob_bear Member

    Joined:
    Sep 27, 2017
    Messages:
    12
    Location:
    wollongong, australia
    Thanks for your reply, what's the best way to tap into the 12v system in your opinion?
     
  4. eclectricdave

    eclectricdave Member

    Joined:
    Feb 24, 2016
    Messages:
    271
    Location:
    Malbourne Australia
    Get it from the 12V bat with your own 100A fuse or circuit breaker. The cgt lighter plug is too low powered.
     
    • Like x 1
  5. bob_bear

    bob_bear Member

    Joined:
    Sep 27, 2017
    Messages:
    12
    Location:
    wollongong, australia
    Thanks for your help.

    Connecting to 12v battery seems straight forward, -ve on chassis and +be labeled in frunk. How do you think think this will affect the life of the 12v battery? I'm worried that it could affect the electronics, do you think this is likely?
     
  6. eclectricdave

    eclectricdave Member

    Joined:
    Feb 24, 2016
    Messages:
    271
    Location:
    Malbourne Australia
    The 12V battery & computer systems are maintained from the traction battery via the DC/DC converter. If you measure X bat terms you will see in XS of 12V. at all times. I think this converter would be rated for at least 100A. You should be able to connect a 1000W inverter to the battery. I dont have one myself. If you were to do this & measured the bat Volts at 1000W & they hadnt dropped it means you have not reached the limit of the converter.
     
    • Like x 1
  7. garyjac

    garyjac Member

    Joined:
    Jan 14, 2016
    Messages:
    456
    Location:
    Brisbane, Queensland
    Nooooooooooooooooooo!!
     
  8. Blue heaven

    Blue heaven Member

    Joined:
    Nov 25, 2014
    Messages:
    732
    Location:
    South West Australia
    I'm assuming you're looking at options for travelling away from home? Rather than use the vehicle directly and risk an onboard 12v issue a better option may be to purchase a portable pack and operate completely independent of the vehicle. Packs such as the one pictured (from Queensland) can be charged from 240v, 12v and solar, are around 7 kgs and wouldn't take up much room. Probably best to research the camping forums and see if they are up to the task required
    . image.jpg
     
  9. eclectricdave

    eclectricdave Member

    Joined:
    Feb 24, 2016
    Messages:
    271
    Location:
    Malbourne Australia
    The last two posters should give reasons why they dont like tapping into the 12V bat
     
    • Like x 1
  10. garyjac

    garyjac Member

    Joined:
    Jan 14, 2016
    Messages:
    456
    Location:
    Brisbane, Queensland
    Well, it's just me, but I suspect that the minute the slightest thing goes wrong with the battery and Tesla hear (or detect) that the owner has been (shall we say) "fiddling" with the thing, then warranty may well go out the door. It's possible that the traction battery or something else in the electrical, or electronics, systems may be affected and...an excuse is an excuse. I'd like to think Tesla was more forgiving than that, but why go asking for trouble, when other practical solutions are available? General safety is the other concern, of course. I'm not suggesting that the described course of action is good, bad or indifferent since I would not have a clue in that direction, but do consider the above possibilities before "fiddling".
     
  11. Blue heaven

    Blue heaven Member

    Joined:
    Nov 25, 2014
    Messages:
    732
    Location:
    South West Australia
    Warranty, you said it yourself Dave in the first reply, also the 12volt battery is important around town, many miles away from home the 12volt battery health is critical, it's just not worth the risk no matter how small if there's another alternative,
     
  12. bob_bear

    bob_bear Member

    Joined:
    Sep 27, 2017
    Messages:
    12
    Location:
    wollongong, australia
    thanks for your reply @Blue heaven & @garyjac, but i'm planning on spending the winter months up at the snow @ thredbo and accommodation is very expensive and I've seen free camping nearby. I'm not sure of other practical solutions without investing a large amount in separate battery storage and portable solar. A suitable portable setup would cost at least $3k and probably closer to $4k to ensure i had enough power. There are numerous HPWC destination chargers in the area so recharging will be straightforward.

    My thoughts are to run two leads, one connected to chassis and the other to the +ve terminal through to the frunk or even hidden under frunk for easy access to connect the inverter. They can be capped off / sealed for when not in use but easily accessed each night to plug in and won't require the frunk + black plastic to be opened each time (especially if it's raining).
     
  13. meloccom

    meloccom Moderator Aus/NZ

    Joined:
    Feb 11, 2008
    Messages:
    1,626
    Location:
    Sydney Australia
    I understand that V2G is not something Tesla is planning at the moment as with free Supercharging the potential exists for a Tesla owner can power their house off Tesla purchased energy.
     
  14. bob_bear

    bob_bear Member

    Joined:
    Sep 27, 2017
    Messages:
    12
    Location:
    wollongong, australia
    I take your point @meloccom - yes i can see why Tesla wouldn't be keen on this, it could open them up to a huge energy liability. But to be honest, who could be bothered going to all that effort each time just to score some power on the cheap? In my situation, I will be camping in a remote area so the need arises more of as a practical one rather than to score free energy.
     
  15. lennier

    lennier Member

    Joined:
    Feb 27, 2015
    Messages:
    573
    Location:
    Melbourne, Victoria, Australia
    Well as an elec eng I'd suggest it's a very bad idea to attempt draws that have not been designed for from the critical electrical systems of a very expensive vehicle. Sure, as far as we know the 12V would get topped up from the main pack, but the draw on the 12V is probably normally very low. Are you 100% confident that drawing higher currents from the 12V will not in some way interfere with the recharging circuitry? Are you certain you can avoid drawing too much and damaging the battery itself and making the car undrivable? Can you be certain you're aware of all the possible consequences of exploiting these systems in a way that has not been specifically designed for? Personally, I wouldn't presume to have enough information to attempt it, YMMV.
     
    • Like x 1
  16. miimura

    miimura Active Member

    Joined:
    Aug 21, 2013
    Messages:
    2,864
    Location:
    Los Altos, CA
    There are other threads on TMC about this. Here is one: Is it safe to connect a large inverter to the 12V battery?

    The DC/DC converter in Tesla S & X is rated for 2,500W. Connecting a 1,500W inverter to the 12V battery and drawing 1,000W is absolutely no problem for any modern EV as long as the DC/DC is operating. Just make sure to connect directly to the battery with sufficiently thick cables. Do not connect to the 12V nosecone terminals if your car has them because they only have a 50A fuse.
     
    • Like x 2
  17. moemoke

    moemoke Member

    Joined:
    Oct 10, 2014
    Messages:
    155
    Location:
    Moe, Victoria, Australia
    If I was the OP I wouldn't be risking the warranty on a $150,000+ car to save a few bucks on accommodation in the snow, best
    off spending the $3-4k on a standalone system if you really need to rough it in the snow.
    Anyone know what the drain is on the traction battery if in camping mode in cold temps?
     
  18. Blue heaven

    Blue heaven Member

    Joined:
    Nov 25, 2014
    Messages:
    732
    Location:
    South West Australia
    Good question, here's a video Mr Nyland prepared earlier-

    Sleeping In A Tesla Model X In Norwegian Winter | CleanTechnica
     
    • Like x 1

Share This Page

  • About Us

    Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.
  • Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


    SUPPORT TMC