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Thread: No permanent 12V - advice on secondary battery solution

  1. #11
    Banned xdjxklusivex's Avatar
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    Quote Originally Posted by Vicne
    xdjxklusivex,

    True, I can just get power from a permanently powered circuit (provided it can supply enough Amps of course).

    Oh, I see, you mean just plugging a homemade plug in the fuse "socket" to get the 12v from there ? That's an elegant solution. Just have to make sure I put back a fuse in the derivated circuit and feed back the original one. Did you hack an old fuse or find such an existing "fuse plug" ?
    well i kinda half assed mine... i just removed the fuse wraped my wire around one of the prongs and jammed the fuse back into it... it works fine no problems yet

  2. #12
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    Quote Originally Posted by xdjxklusivex
    i just removed the fuse wraped my wire around one of the prongs and jammed the fuse back into it
    Mmh, a bit less elegant .
    But well, I see the idea and will use that if the secondary battery solution fails. Thanks.

  3. #13
    Maximum Bitrate KyleYankan's Avatar
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    In the interest of comedy:

    USE A CAPACITOR!

  4. #14
    Well, He asked for it. WebDog's Avatar
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    Quote Originally Posted by xdjxklusivex
    well i kinda half assed mine... i just removed the fuse wraped my wire around one of the prongs and jammed the fuse back into it... it works fine no problems yet
    thats a great idea if you have to undo it.

    I remember installing a power inverter in my moms old leased car.
    1990 Jeep Cherokee
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  5. #15
    Maximum Bitrate KyleYankan's Avatar
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    Speaking of installing inverters: My inverter didnt have any way of mounting it. I did some velcro.

    I put some peices on the nverter sat it down on the carpet for a second and it STUCK. Harder than when i stuck it to the other half of velcro. Could be a possibility?

  6. #16
    FLAC
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    I have basically your first circuit. A 7.2Ah battery with no charge limiting resistor. The problem is that my PC still draws about 80mA when hibernating. That is enough to render the 2nd battery useless for surviving crank in just a day of non car use.

    I would recommend going the EWF approach (XP with read only boot/system disk) and simply letting pc get switched off by having the power cut to it. That's about as non - permanent and quickly removable as you can get... You don't have to use dos to get that!
    Progress: 80% - Permanent install left.
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  7. #17
    FLAC
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    P.S. I don't have a shutdown controller yet. Does the M1-ATX have one built in? If it does, then you won't have any issue with current draw during hibernate.
    Progress: 80% - Permanent install left.
    Motion LS800 Tablet PC and dock.
    Vista, Bu-535 GPS, RoadRunner, MPT2006.

  8. #18
    Well, He asked for it. WebDog's Avatar
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    Quote Originally Posted by Arathranar
    P.S. I don't have a shutdown controller yet. Does the M1-ATX have one built in? If it does, then you won't have any issue with current draw during hibernate.
    yea M1 is a startup / shutdown.
    1990 Jeep Cherokee
    2000 VW Golf TDI 4dr
    2005 VW GTI MKIV - SOLD

  9. #19
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    Quote Originally Posted by Arathranar
    I have basically your first circuit. A 7.2Ah battery with no charge limiting resistor. The problem is that my PC still draws about 80mA when hibernating. That is enough to render the 2nd battery useless for surviving crank in just a day of non car use.
    As already said, the M1 has shutdown control, but does it itself draw current when the PC is turned off ? No idea...
    I would recommend going the EWF approach (XP with read only boot/system disk) and simply letting pc get switched off by having the power cut to it. That's about as non - permanent and quickly removable as you can get... You don't have to use dos to get that!
    Well, I might reconsider that option indeed, thanks. Guess I'll have a look at the appropriate forums...
    By the way, as you don't limit the current, don't you have problems (heat, blown fuse) when you start your engine with the secondary battery empty ?

  10. #20
    FLAC
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    No noticeable problems with over current. Even when the battery was pretty much fully discharged and only at 6V with no load. The battery didn't even get warm.

    Road Runner has support for remembering state with an EWF setup.
    Progress: 80% - Permanent install left.
    Motion LS800 Tablet PC and dock.
    Vista, Bu-535 GPS, RoadRunner, MPT2006.

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