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Thread: UPS Once again...

  1. #1
    Newbie pover's Avatar
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    UPS Once again...

    I know there were many threads about UPS as a Power Source butt...
    I figured out that instead of using 12DC/220AC interver between car batery and UPS to power up the ups, we can connect 12VDC directly to the bateries inside the UPS. (UPS stores V in 12v bateries).

    Using some sort of 12DC/12DC filter to get clean 12V charging UPS bateries will make it excellent Power source... I figured also that my 300W UPS can stand alone without 220AC input and it can power-up it self from its' 12V bateries. 12DC/12DC filter..... i think about laptop car PS...

    ok your turn.... blow my idea
    Pover
    CAR: Volkswagen Corrado 2.0 16v
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    MB: ECS L7VMM3 2500+, 512MB, 10GB 2,5" HDD
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  2. #2
    FLAC robiewp's Avatar
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    that formulation has been discussed too. From what I gathered, there is some concern about heat issues- generally UPSs are designed to not do the DC-AC conversion for too long at a time.
    car computer rev 5: 8" lilliput and usual suspects

  3. #3
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    Is it a fact or just a guess ? if its a fact than is heat the only problem?
    I though that UPS converts DC-AC all the time ?
    Pover
    CAR: Volkswagen Corrado 2.0 16v
    LCD: Lilliput 619GL-70NP/C Touch
    MB: ECS L7VMM3 2500+, 512MB, 10GB 2,5" HDD
    PS: OPUS 150W
    LAN: Wireless LAN USB Adapter 11Mbit, GSM
    FM: External USB TV/FM Tuner + 2Video Cams
    GPS:GlobalSat GPS BU303 USB

  4. #4
    FLAC robiewp's Avatar
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    Not a guess, but not a fact. A true UPS does AC-DC-AC all of the time, but most UPSs are passing the AC through, and then switch to the backup power when the AC coming in one end won't satisfy the draw on the other.
    car computer rev 5: 8" lilliput and usual suspects

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    also, lots of ups es will not start if they do not get a good 220v voltage on their input first.

    other than that, that s what i m trying to do.

    oh...almost forgot, to charge the battery the ups(to full charge) has you would need more than 12 volts so another point mentioned on the board would be applying more than 12 volts to an ups running in inverter mode but i think that s not so important, as the ups, when the power's cut should start somewhere above 13 volts.

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    my UPS EVER GREEN if charged... can stand alone without AC220 connected on input and it inverts 12DC into 220AC until its bateries are down...

    I want to use a relay to power up UPS bateries only when the engine is ON
    My question1 is can it be charged with 12v (13,4 whatever) during carputers power drain from those bateries ?

    Qestion2: Shall I use some sort of DC/DC power stabilizator that can deliver stady level of voltage for UPS bateries? if yes what amount of voltage is recommended (12,5V ; 13V ; 13,5V ; 14V)
    Pover
    CAR: Volkswagen Corrado 2.0 16v
    LCD: Lilliput 619GL-70NP/C Touch
    MB: ECS L7VMM3 2500+, 512MB, 10GB 2,5" HDD
    PS: OPUS 150W
    LAN: Wireless LAN USB Adapter 11Mbit, GSM
    FM: External USB TV/FM Tuner + 2Video Cams
    GPS:GlobalSat GPS BU303 USB

  7. #7
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    Quote Originally Posted by pover
    my UPS EVER GREEN if charged... can stand alone without AC220 connected on input and it inverts 12DC into 220AC until its bateries are down...
    i was saying that if the ups is charged and u turn it off(from the button) then you can t turn it on even if the batterys are fully charged without pluging it to220 mains. it just makes a buzzing sound or whatever. That being the case also, if you put it in a car, after charging it, without turning it off, and it s batteryes get drained. it won t start after that until it is plugged into 220v again.

    That is the case with several UPS es...may not be with yours.
    To see the best charge voltage, just measure it while it is loading from mains. Drain the battery, than plug it in 220v, and measure the voltage applied to the battery.

    hope this helps.

  8. #8
    Low Bitrate cotwild's Avatar
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    big amount of current...

    basicly idea using a UPS isn't that bad..
    but the fact that a UPS consumes a lot of current and that they are made for short power interrupts says "better search for an other solution"!

    i'm looking for this solution too.. but at the moment, i'll prefer using a laptop! then you don't have these problems!
    but in future i'll use a fix carpc too.. i'd like to have a clean install, i don't like that laptop solution so much..

    greez
    dave
    STATUS: planing / building
    Car: 85' Audi Urquattro
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  9. #9
    FLAC robiewp's Avatar
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    Quote Originally Posted by cotwild
    basicly idea using a UPS isn't that bad..
    but the fact that a UPS consumes a lot of current and that they are made for short power interrupts says "better search for an other solution"!

    i'm looking for this solution too.. but at the moment, i'll prefer using a laptop! then you don't have these problems!
    but in future i'll use a fix carpc too.. i'd like to have a clean install, i don't like that laptop solution so much..

    greez
    dave
    Tank! Tank! Tank! Tank!

    [/chant]
    car computer rev 5: 8" lilliput and usual suspects

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