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Thread: reset-on-cranking-

  1. #11
    FLAC cproaudio's Avatar
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    all of you are wrong about having a healthy charging system to prevent excessive voltage drop during crank. The alternator doesnt charge the battery during crank. The alternator requires the engine to turn at least 500 RPM in order for it to produce power. Of course the faster the engine turns the more power the alternator puts out. Starter can only turn the engine at around 200RPM give or take 50RPMs. If you look at the charge/battery warning light, the light stays on during crank until the engine has completely started. The voltage drop during crank depends on the age of the starter and the condition of the battery. A dying starter requres more current to turn it therefore more voltage drop. A battery that's been discharged completely several times can only be charged back up to 60-70% of its original capacity. If a battery has 700 CCA when new, it would have 420-490CCA after it's been discharged several timees.
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  2. #12
    Maximum Bitrate orangewhip's Avatar
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    Quote Originally Posted by camsgs3
    Does this happen with the 150w opus DC-DC unit($190.00, it think)

    Why would someone pay 190 when they can get a cheap inverter and it will do the same!

    whats the difference

    thanks
    There is a new 90W Opus (not on their site) that is a little cheaper and will power a Mini ITX computer and accesories with no problem. It has the cranking problem fixed as well as it allows the proper shutdown of a Windows OS before shutting off the power supply.

    What is the difference? Well, aside from the above 2 items, with a Opus you are just converting the car DC to 12V DC for the computer, whereas with an inverter, you are converting car DC to 110AC then back to the 12V DC inside the computers power supply. This is very inefficient. There is also the point that the Opus uses the cars ignition to start-up (and to shut down obviously) so there is no need for a switch to turn things on/off

    Right now, for the money I would say Opus is the only way to fly if you want to do things right for a non-technical person.
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  3. #13
    Maximum Bitrate none's Avatar
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    orangewhip I like your old avatar better

  4. #14
    Maximum Bitrate orangewhip's Avatar
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    Quote Originally Posted by none
    orangewhip I like your old avatar better

    Hahaha Yeah, I liked it too, but then somebody was copying it, and really, it was just way to disturbing looking at that thing day in day out! hahahaha
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  5. #15
    Constant Bitrate henkbliek's Avatar
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    Quote Originally Posted by Hamster O Death
    Hnrm...I have an Unorthodox underdrive pulley so my alternator tends to charge at lower voltage than normal, eventually resulting in my voltage dropping to around 9 when cranking.

    My understanding is that the inverters automatically shut down once they get below a certain voltage...what would happen if that was disabled (if it could be disabled at all)? Would the inverter only put out fewer volts or would it cause some other trouble?
    The inverter would probably burst in flames. Problem is that when voltage drops, current has to increase to sustain the same output power. And when you allow those currents to rise too far beyond the safe values, nasty things can happen.

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