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Thread: No idea what power supply to get

  1. #11
    FLAC freeflashstuff's Avatar
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    If you do that, tap in before the box on the cig plug. (like the attached picture shows) The circuit board inside shows the polarities for the wires. The box is a power regulator. It takes the dirty 12VDC (really ~14.3-14.4VDC) and cleans it up (to true 12VDC). Also, make sure your cig lighter wiring can handle the current you're going to be pulling.
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    I have bad luck with vehicles...

  2. #12
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    Quote Originally Posted by freeflashstuff View Post
    If you do that, tap in before the box on the cig plug. (like the attached picture shows) The circuit board inside shows the polarities for the wires. The box is a power regulator. It takes the dirty 12VDC (really ~14.3-14.4VDC) and cleans it up (to true 12VDC). Also, make sure your cig lighter wiring can handle the current you're going to be pulling.
    I went to ratshack and looked at the igo systems; the guy said I would need the 120 watt version which runs over a hundred bucks. He also said that due to the amount of accessories I would have attached it might be a better idea to just get another inverter -- they sell a 1500 watt one for $150 and he assured me that it would not make a buzzing sound.

    In the end I might be powering two PCs -- one for navigation and music and whatnot and the other for video and sound recording. Can anyone suggest something specific that I should get? How do I know how much wattage my cig lighter can handle?

  3. #13
    Raw Wave
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    Cig sockets may handle 15A, but anything over 8-10 is usually pushing things. (V x I = Pwr, so 10A = ~12V x 10A = 120W.)

  4. #14
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    Quote Originally Posted by OldSpark View Post
    Cig sockets may handle 15A, but anything over 8-10 is usually pushing things. (V x I = Pwr, so 10A = ~12V x 10A = 120W.)
    So..I should go for the 120W iGo adapter? Is this the best option?

    EDIT: what's to stop me from getting a cig power adapter for my netbook off ebay? like this:http://cgi.ebay.com/Travel-Car-Charg...item255af23f47

    Ive got the Asus eee 1005ha

  5. #15
    MySQL Error soundman98's Avatar
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    nothing, ebay is one of the more prevalent places to get the adapter from.

    if you want to get the radio shack adapter, make sure to get the guys personal cell phone number, and let him know that you will be calling him if it doesn't work...

  6. #16
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    Quote Originally Posted by soundman98 View Post
    nothing, ebay is one of the more prevalent places to get the adapter from.

    if you want to get the radio shack adapter, make sure to get the guys personal cell phone number, and let him know that you will be calling him if it doesn't work...
    Well they didn't have the proper adapter, and I was looking and found this: http://cgi.ebay.com/GENUINE-ASUS-CAR...item518a4ac7b1

    the fact that it's made by Asus makes me feel better, hopefully it will just automatically work with my comp. I think I'll go ahead and just get this.

    How do I know if I'm overloading the cig adapter? I'll have to split it, one for my 7" lilliput and the other for my eee pc which has gps, external wifi antenna, usb port, and obd2

  7. #17
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    Quote Originally Posted by IHateMayonnaise View Post
    So..I should go for the 120W iGo adapter? Is this the best option?
    What you power is different to how...

    Although a dc-dc converter will be more efficient than a inverter, both require several Amps.
    If the cig lighter is up to it & secure enough, fine. But many prefer a dedicated supply - usually off the battery with its own fuse. (Hence independent of cig voltage drops & vehicle wiring; probably relay switched from multiple sources - eg: Ign, Acc, manual, timer, low voltage cutout.)

    If you only require a laptop supply, then just get that (eg 12V to 19V converter). DC ATX etc supplies are usually only for PCs.

    If the other loads are 12V, just use the car supply. (If they are for 12V DC, they should be ruggedised to handle vehicle electrics - unless it's some domestic device intended to run off a 12V DC plugpack....)

    Modern converters should not be noisy. dc-dc converters convert dc-ac-dc - the same as a dc-ac & separate ac-dc system. (But the dc-dc's ac is internal and is high frequency (eg 100kHz) which means greater efficiencies.)


    I'm happy with inverters since they are cheap, universally available, and I have a collection of dc loads. I have since acquired 12V converters for phones, cameras etc economically - but I wasn't going to spend $$$ on specialised 12V supplies when a $$ inverter would do the lot. (And now I'm buying 12V phone chargers for $2 each for their MC34063 voltage converter chips (and fused cig plug, and PCB) so I might dc convert everything - even the rear battery hence saving myself $300 on some "20A smart charger" LOL!!)


    PS - think about HOW you want it powered. EG - only with engine on, or charging, with Acc or any time you want to... with a power-off timer (if not retriggered), or low voltage protection, etc.
    That usually determines whether the cig socket is functionally acceptable.

  8. #18
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    Quote Originally Posted by OldSpark View Post
    What you power is different to how...

    Although a dc-dc converter will be more efficient than a inverter, both require several Amps.
    If the cig lighter is up to it & secure enough, fine. But many prefer a dedicated supply - usually off the battery with its own fuse. (Hence independent of cig voltage drops & vehicle wiring; probably relay switched from multiple sources - eg: Ign, Acc, manual, timer, low voltage cutout.)

    If you only require a laptop supply, then just get that (eg 12V to 19V converter). DC ATX etc supplies are usually only for PCs.

    If the other loads are 12V, just use the car supply. (If they are for 12V DC, they should be ruggedised to handle vehicle electrics - unless it's some domestic device intended to run off a 12V DC plugpack....)

    Modern converters should not be noisy. dc-dc converters convert dc-ac-dc - the same as a dc-ac & separate ac-dc system. (But the dc-dc's ac is internal and is high frequency (eg 100kHz) which means greater efficiencies.)


    I'm happy with inverters since they are cheap, universally available, and I have a collection of dc loads. I have since acquired 12V converters for phones, cameras etc economically - but I wasn't going to spend $$$ on specialised 12V supplies when a $$ inverter would do the lot. (And now I'm buying 12V phone chargers for $2 each for their MC34063 voltage converter chips (and fused cig plug, and PCB) so I might dc convert everything - even the rear battery hence saving myself $300 on some "20A smart charger" LOL!!)


    PS - think about HOW you want it powered. EG - only with engine on, or charging, with Acc or any time you want to... with a power-off timer (if not retriggered), or low voltage protection, etc.
    That usually determines whether the cig socket is functionally acceptable.
    Old Spark:

    Thank you very much for the thoughtful reply. One of the advantages of using a notebook as opposed to a tower is that it has an internal battery, so that I can turn the power off and it will remain in standby. My inverter worked fine, except it had a loud fan and made that buzzing sound (oh, and it died). So anything coming from a cig lighter will work, since I won't really ever be using the system when the car is not actually on.

    I think that I will go ahead and splurge on the $50 to get the car power adapter for my eee pc and just do that; I already got a cig lighter splitter so I can run both my netbook and my screen at the same time. I suppose we will just have to wait and see if it can handle the load.

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