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Thread: you dont necessarily need a voltage regulated PSU

  1. #11
    Deactivated Diewlay Lowmo's Avatar
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    Where are the charging electrics located in the car and how are the batteries connected?

  2. #12
    Maximum Bitrate mushin's Avatar
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    Really, the key here is the cheap (free) gel batteries - without it, this would probably one of the more expensive solutions. Very nice!

    Too bad this wouldn't work for me. Space is at a super premium in my MR2, and I don't particularly want the extra weight either. Oh yeah, I don't have charging electrics either :P

  3. #13
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    Quote Originally Posted by mushin
    Really, the key here is the cheap (free) gel batteries - without it, this would probably one of the more expensive solutions. Very nice!
    Actually they aren't that expensive if you buy them from the right place. My dad used to get his at Ham Radio shows.
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  4. #14
    Variable Bitrate The Grinch's Avatar
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    This is a nice solution unless you're like me and ocassionally run a mission critical app. My setup could use an extra battery though.
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  5. #15
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    Quote Originally Posted by ppgt94
    So if you're using a PC power supply that regulates the power. So it's like this --

    Battery -> Inverter -> AC Power Supply?

    If so this is nothing new.
    like some people have mentioned already, no inverter, no AC PSU, you dont need them. these gels offer a steady constant 12V. The 200W, cool running snap-on PSU just connects directly to the battery terminals. The battery does exactly what it does in the wheelchair, provide smooth steady power.

  6. #16
    FLAC ppgt94's Avatar
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    Quote Originally Posted by bigbertha
    like some people have mentioned already, no inverter, no AC PSU, you dont need them. these gels offer a steady constant 12V. The 200W, cool running snap-on PSU just connects directly to the battery terminals. The battery does exactly what it does in the wheelchair, provide smooth steady power.
    How do you get the 12+, 5+, 3.3v switching voltages, etc to the mobo and other components?

  7. #17
    MySQL Error MatrixPC's Avatar
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    I "think" this is what he use.
    - el cheapo snap-on style DC-DC PSU (unregulated 12V line) that some of you guys use with VIA mobo and laptop HD, CD/DVD ROM.
    - Wheelchair battery.

    Since the wheelchair battery output smooth/stable 12V, regular HD and CD/DVD ROM is safe for 12V rail. Other voltage is still regulated by that small snap-on DC-DC PSU.

    Am I correct?
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  8. #18
    Raw Wave Confused's Avatar
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    How do you charge the batteries from your alternator, and still get them to supply a constant 12v?

    Unless there is a regulator between the wire coming from the alternator and the wire that the PSU is connected to, then you are pumping whatever is coming from your alternator (anything up to 14.x V) through your "200W" power supply, and into your computer.


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  9. #19
    Deactivated Diewlay Lowmo's Avatar
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    I think he's saying its connected to the factory fitted charging electrics, implying that it's an isolated circuit, and safe to use.

    Someone care to elaborate on this? Smoke and mirrors?

  10. #20
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    Quote Originally Posted by mgars
    i believe it is in the fact that everyone else is talking about very expensive OPUS power supplies and the like. In this case, you just go buy (or get one from the wheelchair guy) a battery, hook it up with a diode on the other side of the alternator and you have what amounts to a very reliable and chargeable power supply. This offers, imho, a cheaper and better solution, especially if you are using a laptop.
    just a thought about this diode idea, it might not stop the voltage surge at crank. My split charge relay on the other hand does, they're as cheap as chips and can be found everywhere, i got mine from a caravan reseler, and designed exactly for this purpose.

    just my $0.02

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