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Thread: Using Battery Charger in the House?

  1. #1
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    Using Battery Charger to Extend Battery Life?

    Okay, I have never really had a good understanding of amperage and current flow.... Here is the issue...

    I have the CarPC all together in it's case, and have been running it off a 12VDC lawn mower battery as I work on the final hardware issues. It would be very difficult to hook it up to a standard ATX PSU right now and run it from AC.

    But now I have to reformat the HD and get the software the way I want it. But this lawn mower battery does not have enough life to do a full HD format and install Windows before the voltage drops too low and it shuts down.

    If I had the computer running off the battery, doing what I said above, and attached my car battery charger to the lawn mower battery, would I fry something in the CarPC?

    The charger has two current setting (2A and 10A) and I think this means it forces 2A or 10A to the battery and whatever else might be hooked up..... I know the system is drawing more than 2A, so it seems to me like it would extend the battery life so I can get the software stuff done before the battery runs dead. Now maybe the 10A setting would be too much, I don't know....

    The whole deal just makes me nervous.

    What do you think???

  2. #2
    Variable Bitrate MeanGT's Avatar
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    I used to run my Heavy load 12v devices directly of my car battery charger. I would set it to the 50-amp jump start setting. Just becaues the charger is putting out up to 50 amps, doesnt mean you will over-power your PSU, the PSU will only take how much amperage it needs. If you think about it, a car battery can put out many hundres of amps and cause no harm.

    The only problem I ran into using the battery charger, is that the power output is quite a dirty signal, so you may get interference or noise when using it.
    My OLD Carputer: http://www.mp3car.com/vbulletin/showthread.php?t=17412
    Currently, Don't have a carputer :( I sold my lincoln and bought a '93 Acura Vigor, plan on putting a carputer in it one of these days. You can see my vigor at: This Site

  3. #3
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    Quote Originally Posted by MeanGT
    I used to run my Heavy load 12v devices directly of my car battery charger. I would set it to the 50-amp jump start setting. Just becaues the charger is putting out up to 50 amps, doesnt mean you will over-power your PSU, the PSU will only take how much amperage it needs. If you think about it, a car battery can put out many hundres of amps and cause no harm.

    The only problem I ran into using the battery charger, is that the power output is quite a dirty signal, so you may get interference or noise when using it.
    Thanks for the info MeanGT.... I just can never comprehend current.... I was under the impression that Battery Chargers "Forced" current to whatever is attached to them...

    But I guess not based on you using a 50A setting... by the way, what do you mean by "Heavy Load 12V devices"????

  4. #4
    Variable Bitrate MeanGT's Avatar
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    Quote Originally Posted by dug1967
    Thanks for the info MeanGT.... I just can never comprehend current.... I was under the impression that Battery Chargers "Forced" current to whatever is attached to them...

    But I guess not based on you using a 50A setting... by the way, what do you mean by "Heavy Load 12V devices"????

    I frequently find myself repairing things such as head-units, and amplifiers for myself and friends, and rather than lugging in a 12v battery to test them, I just bring in my battery charger. A true power supply that puts out enough current to handle these items can be quite pricey.
    My OLD Carputer: http://www.mp3car.com/vbulletin/showthread.php?t=17412
    Currently, Don't have a carputer :( I sold my lincoln and bought a '93 Acura Vigor, plan on putting a carputer in it one of these days. You can see my vigor at: This Site

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