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Thread: Secondary battery?

  1. #1
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    Secondary battery?

    i want my carputer to stay on all the time, and just enter hibernate mode when the car is powered off. however, i don't want to risk the chance of the computer draining the battery and getting stranded somewhere. so i figured, why not just get a secondary battery. what im thinking is get another battery, and link the 2ndary using a battery separator. so that way, the carputer will run off of the 2ndary and if that gets drained, all that happens is the computer turns off. then next time i drive, the 2ndary will get recharged and should be set for another little while.

    does this sound like a good solution or are there other problems with it? will i need a more powerful alternator? has anyone tried this?

  2. #2
    Newbie BigRedBee's Avatar
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    I've done this, and so have many others. I've had limited success, and have had to replace my secondary battery (Optima Yellowtop) twice for some unknown reason that I'm still debugging.
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  3. #3
    Variable Bitrate
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    I can cut the power to my setup in hibernate mode, do you mean standby mode?

  4. #4
    Maximum Bitrate falconey's Avatar
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    check this thread... Holy Fkkk I found hibernation..... if you can survive crank with an inverter once in hibernate you don't have any issues with the battery draining because the computer won't even see power if the inverter is off.

  5. #5
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    isolator

    I have tried this using a nice big isolator, thing is, seems like I drop 2-3 volts using the isolator, and while driving with all my **** on, lights, AC and stuff it would kill my carputer. I just remvoved the isolator now and am running the two batteries in parallel mode and I have tons of voltage and works nice now.

  6. #6
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    any reason why you'd wire it in parallel rather than series??

  7. #7
    Maximum Bitrate falconey's Avatar
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    Running this in parallel is the wrong thing to do. Too much strain on the alternator trying to keep both batteries at the same capacity. Over time you will crap your alternator by doing this. Also if one battery is dead, both batteries are dead.

  8. #8
    FLAC Chairboy's Avatar
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    Putting them in series will mean 24v, techijatt.

  9. #9
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    right on the money of what chairboy said. if you do series, you'll just end up frying the electrical circuit at 24v. Can't do that, parallel only option.

  10. #10
    Newbie kingmissel's Avatar
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    I have 2 batteries hooked up. Separate them by a Huge relay. I have a 200Amp Stinger Relay that connects the batteries in Parallel when the key is on. They disconnect from each other when the key is off. Then my main battery starts the car, while my 2nd battery was powering the PC for a few hours. Works great!
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