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

  1. #31
    Newbie
    Join Date
    Mar 2004
    Location
    Belgium
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    26
    Hello all, i'm new here and reading allot

    but i do notice that everybody is talking about watt and not about current (A)
    I calculated my total watts with this
    http://www.mymp3car.com/MP3Car/PSUpower.asp
    I get total of 85 Watt so i think my setup would work with an opus 90 watt
    but i see that my 12volt rail is gonna need 3.65A does the 90 watt opus deliver this ?
    I know the 150 watt version 'only' has 5A at the 12v rail

    I know that P = U * I but i don't know the exact watts that the opus gives on the 12volt rail so i can't calculate the exact amount of ampere i would get at 12 volt rail

    or am i missing something ?

    edit:
    Just found opus 90 watt specs and the 12 volt rail only has 2.5A so that wouldn't work, i think.

  2. #32
    Variable Bitrate
    Join Date
    Dec 2002
    Location
    Chico, Ca
    Posts
    315
    The diode and battery trick is possible but there is a problem. Since the diode lowers the voltage to the sealed battery by a volt or so it lowers the charging voltage to the sealed battery. If your alternator cranks out 14.5 volts when running and the diode sucks a volt then the sealed battery will only see 13-13.5 volts.

    This is barely enough to charge the battery in my experience. I did however have the sealed battery setup to charge only when the car was running so if I drove the car only a few minutes a day it wouldn't have enough time to charge.

    I figured that if I set the sealed battery to charge even if the car was off then I would be constantly draining my battery because of the voltage difference. Bottom line it can be done but takes some work.

  3. #33
    Low Bitrate
    Join Date
    Mar 2004
    Posts
    108
    Quote Originally Posted by adamis
    The diode and battery trick is possible but there is a problem. Since the diode lowers the voltage to the sealed battery by a volt or so it lowers the charging voltage to the sealed battery. If your alternator cranks out 14.5 volts when running and the diode sucks a volt then the sealed battery will only see 13-13.5 volts.

    This is barely enough to charge the battery in my experience. I did however have the sealed battery setup to charge only when the car was running so if I drove the car only a few minutes a day it wouldn't have enough time to charge.

    I figured that if I set the sealed battery to charge even if the car was off then I would be constantly draining my battery because of the voltage difference. Bottom line it can be done but takes some work.
    someone else had mentioned a rechargeable battery (what size i wonder?), which sort of makes sense... quick charging (on 12V)... not necessarily for a tank setup, but for maintaining adequate voltage while cranking. makes sense... it only needs to support for what? 2 seconds?

    btw... here are the numbers on my electrical system:
    OFF: 12.05.05V
    ACC: 11.8V.05V
    ON Position: 11.66 - 11.76 (varies on amt of accessories on)
    CRANKING: <2sec @ 9.6V.1V
    Running: 14.4-14.6V

    whats the prognosis doc?

  4. #34
    Low Bitrate
    Join Date
    Mar 2004
    Posts
    108
    ok i've got a plan.

    i've realized this:
    1. i want the computer on only when choose, not everytime i start the car.
    2. i want the computer to shut down automatically when car is turned off.

    so, after researching the "fake UPS/XP" shutdown controller (someone please verify that this works), i've decided i'm going to scrap saving for an opus, dodge the ITPS, and rather go with a "press to turn on" route.

    so, with a pw70, i'm guessing with no ITPS, i'm gonna need 12V regulation. what do i need to do to regulate and condition the 12V power line properly? thx.

  5. #35
    Maximum Bitrate yunusyu's Avatar
    Join Date
    May 2004
    Location
    Hollywood
    Posts
    715
    Opus does all that for you...itps and pw70 are all in an opus..so choose
    OPUS or (itps & pw70...a tank would not hurt either if u want it to work at crank )

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