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Thread: inverter and power drain question

  1. #1
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    inverter and power drain question

    Hi All,

    Xmas has been good and delivered a 650W inverter for me, does anybody know, if I switch the computer off but leave the inverter switched on will this still drain the battery?

    If I put the computer into hibernate how much more current will this draw than the above scenario?

    Cheers

  2. #2
    Maximum Bitrate starfox's Avatar
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    If your inverter is a soft start inverter it will always draw some residual current to keep the caps charged and the rest of the circuit in standby.

    If you have an ATX power supply, and you switch the computer off without disconnecting the power lead it will also continue to drain some current to supply the 5V standby line.

    Hibernation: Hibernation is the same as switching your PC off in the above scenario, so it'll drain a little power as well, but no more than leaving your PC off (but still plugged in).

  3. #3
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    cheers for the reply, just looked at the time stamp, do u sleep? LOL

    i don't think it is a soft starter, there is a rocker switch with a definite on and off position.

    Is the current drain significant enough to worry about or is it more of a trickle that will be more than sufficiently topped up by the normal running of the car.

    Would it help the situation if I had an uprated alternator and 2 deta orbital deep cycle battereies or is this simply delaying the inevitable?

  4. #4
    Maximum Bitrate starfox's Avatar
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    Time? ahaha i wake up early ^^ (i'm also in Australia.. that might explain it?)

    The current drain isn't usually that much.. my guess is maybe 1-2A if you leave your inverter on and leave your ATX PSU in standby mode.

    If you upgraded the alternator and had extra batteries then yeah you probably wouldn't have to worry

    You could always try it first; just carry a multimeter around with you and measure you battery voltage across the battery terminals and make sure it doesn't drop too much (too much is when it's less than 12 volts). If it drops that much then start doing stuff.

  5. #5
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    Australia, summer, nice......
    UK, winter, sux.....

    OK good starting point, cheers for that.

    When u say start doin stuff.... like what, the only obvious thing I can think of is to switch off the inverter.. but.. won't that kinda kill the required power needed for the computer to be in hibernate or am I misunderstanding hibernate, it does need power doesn't it, albeit a small amount?

    Cheers

  6. #6
    Raw Wave Confused's Avatar
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    Hibernate mode doesn't need ANY power.

    It writes what is in RAM to the hard drive, and then switches all power off.

    When you turn it back on, it reads back from the hard drive into RAM, just as it was before

    So, you could turn the inverter off.


    Garry
    Co-Developer of A.I.M.E.E
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  7. #7
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    one question: for your opinion, how long could you use the carpc with the engine off and whitout damage the battery ???
    My future system, will use a Morex 55w DC-DC.
    Thanks in advice
    Max

  8. #8
    Raw Wave Confused's Avatar
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    bambuzo,

    It depends on the power draw of your computer, and the capacity of the battery.

    Oh, and if if you're going to buy more stuff...i SERIOUSLY suggest getting yourself an Opus. For what you get, it really can't be beat. I am going to be getting myself a couple in a couple of months (as you see in my sig, i have 2 cars, both of which will eventually have fully-fledged carputers in them!)


    Garry
    Co-Developer of A.I.M.E.E
    www.aimee.cc

  9. #9
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    Yes, the Opus solution ( as the ITPS i think ) it's the good one, but with it , i'm out of budget for this pre beta test.....
    The inverter's way is the most cheap at the moment...
    Thak u for the reply !
    See ya

  10. #10
    MySQL Error MatrixPC's Avatar
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    Quote Originally Posted by bambuzao
    one question: for your opinion, how long could you use the carpc with the engine off and whitout damage the battery ???
    My future system, will use a Morex 55w DC-DC.
    Thanks in advice
    Max
    Normal car battery will get bad if you drain the battery 3-4 times.
    The question of how long can you leave the computer running with the engine off is depend on the battery capacity and how good the battery is and how much power the inverter is using. So the duration is depend on the health of the battery and its capacity and efficiency of the inverter and PSU. If you system is actually using about 150W of power, the battery may have to supply more than 150W (said 200W)
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