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Thread: Power Question, Two Battery Set Up

  1. #1
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    Power Question, Two Battery Set Up

    Hi, I'm new, been lurking about a month, and have read just about every post. The goal is an install for my son. Mp3's, Navigation, Dvd, and Playstation. I went with the two battery set up because I'd hate for him to get stranded somewhere because of negligence, he gets his license in a few months. I've built plenty of computers, that won't be a problem. Relays, Pots, and Pic Programmers on the other hand will be a challenge I'll get into eventually. I'd like to know if my plan below is the right way to go with a two-battery set up. Is there anything I've left out? The arrows may be a little off, but you get the idea. Thanks for the help.





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  2. #2
    Neither darque nor pervert DarquePervert's Avatar
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    Wow.... Very cool thinking, there pops...
    My two cents:

    Although, I'd think it would be better to get your son involved in the project so he could learn about what you're doing and how to do similar stuff.
    If he learns from it, he could have a part-time job installing stereos and whatnot for friends....

    And I think a teenaget with a playstation in his/her ride is a horribly BAD idea. The computer itself is iffy, although the logic behind is sound, especilly the navigational capabilities.
    Teenagers are sketchy drivers because of minimal experience. Add in a distraction like that and the problem is compounded.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  3. #3
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    My son is not a geek at all, he's a musician, it's just not in him, but I will make sure he knows the basics. As for driving, I've thought of that. Playstation will only play from a ceiling mount, the in dash will be navigation and mp3's. He's a very responsible kid that truly deserves a reward or I wouldn't even be considering it.

    What do you think of the wiring I have in mind?
    A pic is worth a thousand words.

  4. #4
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    Quote Originally Posted by Vee24
    Hi, I'm new, been lurking about a month, and have read just about every post. The goal is an install for my son. Mp3's, Navigation, Dvd, and Playstation. I went with the two battery set up because I'd hate for him to get stranded somewhere because of negligence, he gets his license in a few months. I've built plenty of computers, that won't be a problem. Relays, Pots, and Pic Programmers on the other hand will be a challenge I'll get into eventually. I'd like to know if my plan below is the right way to go with a two-battery set up. Is there anything I've left out? The arrows may be a little off, but you get the idea. Thanks for the help.
    You have left out fuses. You need a fuse at each end of the wire connecting the two batteries...within 18 inches of the battery. This is because both batteries can supply current and if the wire shorts to ground....
    Also it's a good idea to have a fuse for each device you connect.

    Rob.

  5. #5
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    Thank you Gommino, I knew I needed fuses, but forgot to include them in the drawing. I didn't know however that I needed one for each device as well, so thanks very much for your help.
    A pic is worth a thousand words.

  6. #6
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    You could easily wire it so that the playstation, or any other component will only worj when the handbrake is up...i.e. when parked, or hand brake turning in abonded industrial estates....lol

  7. #7
    Variable Bitrate HHdesign's Avatar
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    Speaking from a teenager's view. I am only 16, and I dont think it would be a wise idea for me to try and look at a monitor or screen when I am driving. I'm not a bad driver, but I am not the best. I am the only one of my many friends who has not wrecked their car, or gotten a ticket. Even the most responsible kid, isn't a perfect driver. I am mounting my screen in the rear of my center consol so I wouldnt be tempted to use it while driving. I most often time hook my up Ipod and play a playlist so I dont have to worry about look at the HU.

    I'm not trying to give a parental lesson or anything, but its my feeling that, well I wouldn't want this in my car if someone gave it to me. Half the fun of putting this stuff in is earning the money and doing it, and having the satisfaction of doing it yourself, and it being yours. I would never want a new car for my 16th birthday, or one with a carputer already installed. I'd want to earn it.

    Plus here is my feeling on it, you put a carputer in for one reason, to use it. And using it while driving is not a good mix.

    just my unsolicited two cents.
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  8. #8
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    If only everyone was as sensible as you lad....the roads might be a safer place.....but I feel we have gone way off-topic here.

    In an attempt to get back on-topic.

    I honestly have no-idea about two battery set-ups....my only suggestion would be to make sure the alternator is capable of keeping both batteries charged.

  9. #9
    Constant Bitrate old_lou's Avatar
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    If the inverter is producing mains then the psu is connected to it not the battery? unless I am missing somethig also the isolater needs to only strap together the 2 batteries when the engine is running so its coil is fed from the accesory line (its goes dead on crank) so any voltage drop is not passed to the second battery on crank. Plus with the ignition off he never kills the main battery voltage.
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  10. #10
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    Here's my revised drawing with fuses added in blue. The inverter line goes to the playstation but I didn't label it. I'm also adding a pic of a two battery set up I found at a battery isolator company's website.

    According to that set up, I'll use 8 gauge wire and 60 amp fuses, right?



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