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Thread: Low power alarm, kind of

  1. #1
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    Low power alarm, kind of

    Here is my setup I have two deep cycle 75amp hour batteries wired in parrallel (12volts) powered by a seperate 100amp Ford Alternator. This system was working fine for the past couple of weeks. I am running a 14" lcd (3amps at 12volts) and a anthlon 2200 with a 250watt power supply off a 300 watt continious inverter. Tonight the inverter started squeeling really bad and had problems delivering power to the computer. .... strange the inverter is old so I went out and bought a new 750watt continous inverter wired DIRECTLY to both of these deep cycle batteries and it starts squeeling and giving battery errors tooo!!!!!! but only with the computer on...?!?!?! very strange so I figure cheap power supply since hte power supply buzzes even with everything is off but the inverter. I have replaced it with a 425 watt $99 power supply , haven't tried it yet... ideas? is it the power supply? what is causing this, the computer works fine inside (off house power) even on that old crappy power supply... I have run many power supplies off "modified sine' inverter with NO problems for years? is this one just super cheap?

  2. #2
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    I installed known good 425 watt power supply in the computer and the problem still occurs. The only thing I think it could be at this point is the inverter is not getting enough power from the battery?

  3. #3
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    Hi System-f.

    To see if your inverter is getting enough power from your battery you need to measure the voltage coming into your inverter. If it reads below 11 volts or so, I would be concerned.

    Also, have you recently upgraded any components in your computer? If so, try to remove those parts and see what happens.

    Hope that helped.

    Good luck.

  4. #4
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    It helps when the second alternator is actually CHARGING the batteries. At the time I didn't have my DMM to test the batteries..

  5. #5
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    :-( my inverter does the same its funny because my pc ran perfect off a 75 watt inverter untill a week ago when it just wont boot up... so then i got a new inverter and its squeeling now i got a colman 400 watt /800 peek inverter... i was wondering is there anyway to add like a capasatator? i have it hooked upto a fuse under my dash and grounded at the same point as my computer powersuply to get rid of the alternator whine... help :-D hehe

  6. #6
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    Hi xdjxklusivex.

    A capacitor will not help you in this case. Capacitors are usefull to keep a nice clean voltage when there are lots of quick high power pulls. For instance, when a subwoofer moves, it draws a lot of power for a very short time. But there is time in betwee where it does nothing, and that time is used to recharge the capacitor that just gave it all the power to move. So think of a capacitor as a very short life battery that can quickly recharge. Your computer uses a relatively constant supply of power, therefore there would be no time for a capacitor to recharge.
    Your problem is probably vehicle related, just like System-f.
    Like my previous post said, check the voltage going into the inverter.
    Also, disconnect any new devices that you installed onto your computer.

    Hope that helped.

    Good luck.

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