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Thread: Opus = Best, but will ITPS suffice for low end?

  1. #21
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    to confirm: the voltage drop with ITPS causes the PSU to shut down correct? this could not be avoided by modifying the default BIOS voltage settings right?

    and if i'm getting this right... UNLESS i want to use it w/o car on, the ITPS/PW70 will work well for powering, and controlling startup shutdown, right?

    if i find the need to run while car off, i will use a tank setup. sound good?

  2. #22
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    Quote Originally Posted by cybermob2

    WTF? if the thing is gonna shut down w/o alternator, then how does it stay running to initiate shutdown sequence? eh? ie i turn off my car... ITPS initiates shutdown and stays on til off.
    anyone care to explain this? doesn't seem like if it won't work with car off, its not gonna shut down properly after i turn it off.

  3. #23
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    Quote Originally Posted by cybermob2
    anyone care to explain this? doesn't seem like if it won't work with car off, its not gonna shut down properly after i turn it off.
    Now you see why we say the ITPS/PW combo has problems. :P

    Not all cars will have this particular problem. Many cars will run the ITPS/PW for a while with the car off, but some don't have enough voltage without the alternator turning. You will have issues while cranking the starter on any car, however.

    Here's a $79 alternative (I'm beginning to sound like a broken record around here, but it's nothing compared to the Opus chorus.) http://www.arisecomputer.com/ps/mpd810.asp Doesn't have shutdown controller functionality built in, but will work with a neutered ITPS (reg bypassed, negating the negativity we are talking about) or a Mucha controller. And it will definitely work with the engine off. Still trying to determine it's cranking performance, but a voltage range down to 10v is promising.

  4. #24
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    Quote Originally Posted by none
    Opus chorus.
    ROTFL thats great. OPUS RULES! yes, i get it, opus rules. doesn't mean you can't use something else.

    it won't be but short time before OPUS-like power supplies are cheap, reliable, and readily available. i'm just not down with buying stuff when it first comes out (ie DVD burners @ $1000+, OPUS @ $200, etc)

  5. #25
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    That is complete and total BS that the ITPS will not work with the power off. I have installed 3 systems so far and all 3 work flawlessly with the car off and the ignition in the ACC position.

    EPIA M10K, ITPS with PW70.

    It is however true it will not survive a crank.

  6. #26
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    I'll confirm that the ITPS will stay on for a while when the car is off. I think 15 to 20 minutes for me. It is certianlly enough time to hibernate the computer when you park the car.

    Going with the ITPS has it's advantages but there are a few things you might want to check before you purchase one. Measure the voltage of your battery with the car running. It should be around 14.5 volts or so. Then with the car still running turn on every electrical item you can think of. Defroster, windshield wipers, stero, headlights, fans, the works. Keep an eye on the voltage and see if the voltage drops below 12 volts with all of this stuff running.

    If it does then you might want to be cautious with the ITPS and consider just using it as a shutdown controller without the 12v regulation. I've used the ITPS for a while and for the most part have been happy but my car's electrical system is 12 years old now and my alternator has 180K miles on so I sometimes get resets when idling at a stop light at night. I'm currently trying to figure out my next course of action, rebuild my alternator, get an overdrive pully, run beefier cables to the powersuppy etc... All of which will have to wait for summer.

    I was thinking about dropping a line to the designer of Ituner and asking him if he could add jumpers for the reglation or not.

  7. #27
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    Quote Originally Posted by adamis
    I was thinking about dropping a line to the designer of Ituner and asking him if he could add jumpers for the reglation or not.
    That's a damn bright idea.... I think I will do that with my ITPS.... instead of soldering across the pads on the board, install a two pin jumper (if the width of the pads is right) or maybe even wire a switch. Turn the regulation on / turn the regulation off.... That sounds like a winner.

  8. #28
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    i was reading in the iTuner document on itx car solutions that voltage dips (specifically cranking) can be overcome by an isolated "sealed acid battery" with inline diode. someone else mentioned an isolated rechargeable battery. is this the same "tank" concept? does it work?

    if all i gotta do to keep the pc running while i restart my car after getting gas/whatever is throw a rechargeable battery on the line w/a diode then why not? i don't want flawless operation - let me be clear - i just don't want starting/stopping to be a hassle (less hassle than an invertor).

  9. #29
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    oh... and i've been looking @ morex cases with built in dc-dc supplies - will the ITPS work with anything besides the pw70 such as this case? oh, and have enough juice to run a 3.5" HD?

  10. #30
    Constant Bitrate P4_2.66GHz's Avatar
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    Why not simply buy a good and reliable power supply and be done with it?
    I had experimented with PW60A before I had tried Opus. It died on my test bench with all of the periferals I had connected. No, it didn't die right away, it took its sweet time.
    A brand new replacement, factory-sealed, is still laying around somewhere.

    Opus will not go down in price any time soon. It is a proven, reliable performer. There is no equal at this time.

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