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Thread: 2nd Battery

  1. #21
    Variable Bitrate P3D4T0R's Avatar
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    What about my proposed setup? Work? Not work?

    Thanks
    P3D4T0R
    "Mess with the best, die like the rest."
    Work Log --> Old Car (Totaled)
    Work Log v2 --> New Car (Totaled)
    Work Log v3 --> GMC Suburban K2500 (Engine died)
    Work Log v4.5 --> 05 Toyota Tundra DC SR5

  2. #22
    Low Bitrate Pandaman72's Avatar
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    Quote Originally Posted by P3D4T0R View Post
    What about my proposed setup? Work? Not work?

    Thanks
    P3D4T0R
    Yeah, I suppose it will work. It's a nice size battery 17AH is pretty good - mine is only 7AH and it keeps the carputer running for 1 hour on it's own.

    The rectifier is the same as a diode - it just stops the current passing one way, so it will work no dramas in my opinion.

    Panda
    Car - Ford Falcon XR6 Turbo, footwell lights, Pioneer front speakers
    Carputer- P3 966MHz, 256MB RAM, 200GB HDD, 300W PSU

  3. #23
    Variable Bitrate P3D4T0R's Avatar
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    Alright, I was worried that the diode/rectifier my not be powerful enough but I guess I was just being paranoid, Thanks man...

    btw I have a choice of 7, 12, 17Ah. What is your systems power consumption? I have a shuttle P4 3.something, XM Direct, external sound card, and a 3.5 hdd running off a 200watt 12v psu. Knowing that, what do you recommend?
    "Mess with the best, die like the rest."
    Work Log --> Old Car (Totaled)
    Work Log v2 --> New Car (Totaled)
    Work Log v3 --> GMC Suburban K2500 (Engine died)
    Work Log v4.5 --> 05 Toyota Tundra DC SR5

  4. #24
    Low Bitrate Pandaman72's Avatar
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    Quote Originally Posted by P3D4T0R View Post
    Alright, I was worried that the diode/rectifier my not be powerful enough but I guess I was just being paranoid, Thanks man...

    btw I have a choice of 7, 12, 17Ah. What is your systems power consumption? I have a shuttle P4 3.something, XM Direct, external sound card, and a 3.5 hdd running off a 200watt 12v psu. Knowing that, what do you recommend?
    40amps should be just fine!!

    As for power consumption, I use this website - http://carpc.kyferez.com/Tools/PSUWattageCalculator.php to calculate power consumption. The power consumption of mine is about 170Watts, and plugging your details in it tells me 210Watts (I took a stab in the dark about RAM / fans etc)

    Have a look at the site and you can find out for sure.

    Panda
    Car - Ford Falcon XR6 Turbo, footwell lights, Pioneer front speakers
    Carputer- P3 966MHz, 256MB RAM, 200GB HDD, 300W PSU

  5. #25
    Variable Bitrate P3D4T0R's Avatar
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    Quote Originally Posted by Pandaman72 View Post
    40amps should be just fine!!

    As for power consumption, I use this website - http://carpc.kyferez.com/Tools/PSUWattageCalculator.php to calculate power consumption. The power consumption of mine is about 170Watts, and plugging your details in it tells me 210Watts (I took a stab in the dark about RAM / fans etc)

    Have a look at the site and you can find out for sure.

    Panda
    Will do, you were a big help, thanks a lot man
    "Mess with the best, die like the rest."
    Work Log --> Old Car (Totaled)
    Work Log v2 --> New Car (Totaled)
    Work Log v3 --> GMC Suburban K2500 (Engine died)
    Work Log v4.5 --> 05 Toyota Tundra DC SR5

  6. #26
    Newbie Impreza_555's Avatar
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    Will an optima work for a 2nd battery?
    What if you use a regular battery?

    Sorry for the noob questions...

  7. #27
    Newbie Bizarro's Avatar
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    It's the standard dc relay numbering. 85 connects to the ACC switch 86 goes to ground, this energizes the coil in the relay causing 30 which is connected to the car battery to engage with 87 which feeds the pc battery. Make sure that you have a sufficent amperage relay to support the battery draw on the pc battery side or you are going to fry the relay. Also as stated fuses are not shown.

  8. #28
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    I install custom electronics in semis and there is one easy answer. What you need to do is get a alternator that can power 2 batteries and install a battery isolator. Install everything like you would to the second battery and run the accessory power wire (the one that tells the device that the car is on) to the normal place. A setup like this will prevent the main battery from being used if the car is off but provide power and charging to the second battery.

    Drive time and the amount of power demand is what will determine the amperage of the alternator.

  9. #29
    Constant Bitrate ankur's Avatar
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    Hi all,
    I am thinking of putting a second battery in my install but i am a little confused on the grounding. Can the second battery also be grounded to the car common ground or would i need to take the ground of the second battery straight to the Car PC only ?
    thanks.

  10. #30
    Maximum Bitrate MobiTekLink's Avatar
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    Not sure why people need dual batteries just for a PC, CarPC's should be low power consuming devices, and unless you have some crazy amps kicking some crazy music you should be ok with 1 battery. Does your computer freeze when restarting? Does it reboot? Have you checked it already?
    08 Lincoln Navigator www.mobiteklink.com

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