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Thread: Need HD Electromechanical Relay

  1. #1
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    Post Need HD Electromechanical Relay

    I am looking for a relay with coil voltage 12 volts and contact rating between 70-100 Amps. Any switch function would be fine. (SPDT, DPDT)
    No fellows, I didn’t make a mistake—it’s 70-100 Amps of pure juice.
    Maximum current rating that I have found so far is around 30 A. My power circuit is over 60 Amps.
    I am planning to use more stuff than just a computer, so I need heavy-duty relay to hold so many loads.
    Maestro MP3 player: MIS K7T Pro-2A, AMD 1.2GHz, RAM 640MB, 80G HD; Screen: Datalux 10.4 VGA; Head Unit: Kenwood Z727; RF control ON/OFF/RESET

  2. #2
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    Why not use multiple relays? then use one small relay to control those relays.
    I cheat, I own an empeg.
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  3. #3
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    Can you be more specific?
    Maestro MP3 player: MIS K7T Pro-2A, AMD 1.2GHz, RAM 640MB, 80G HD; Screen: Datalux 10.4 VGA; Head Unit: Kenwood Z727; RF control ON/OFF/RESET

  4. #4
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    Ok. So you have 60 amps of stuff you want to power.. More than one load I'm assuming? Computer, Amps, Lights, whatever..

    So you get a few 30 amp relays and then a smaller relay.

    hook up all the relays

    attach them to the devices you want to power (something like one relay to computer inverter/psu, one to amp)

    then connect all the switch leads of the relays to the smaller relay and the switch lead on that to a switch



    may not be the best way.. but sounds good in my head.
    I cheat, I own an empeg.
    Meskimen's Law: There's never time to do it right, but there's always time to do it over.
    http://civic.mp3car.com

  5. #5
    mpt
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    Question

    You´re not using it on a car, are you?
    70A x 14V = 980 watts!! Not even on a truck!
    It´s lot of juice...

    mpt
    mpt

  6. #6
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    Post

    MPT has a good point. Most cars have 60 amp alternators--which in addition to the stuff you are running also has to power your lights, fuel pump, and ECU (if your car has one). it also has to charge your battery, so dont say "oh, i'll just get a second battery"

    My truck has a 110-amp alternator, and I wouldn't dare try to run 60 amps of accessories
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  7. #7
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    Ok forget about the multiple relays, its possible using them but usually they will get hot and be come unreliable. The solution is using a solonide fome the starter motor of the car. It takes around 0.5 amps to operate but can be used to switch circuts well over 100amps.
    I have my mp3car computer on 24 hours ( its not only a mp3 car but it also controls whole car) as im using two batteries and if i want to use the second battery to start the car in case the first one gone flat im using the solonide to switch it in to the power rail of the car.
    There is your solution.
    Fosgate

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  8. #8
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    Mmmm, good idea.. Didn't think of that..



    Well there are high current Altenators.. the one i can get for my civic pushes like 150 amps.. so i'm sure you can get one for just about anything else.

    Stinger's High Output Alternators for Honda Vehicles
    I cheat, I own an empeg.
    Meskimen's Law: There's never time to do it right, but there's always time to do it over.
    http://civic.mp3car.com

  9. #9
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    My mom's Caddy has 150-Amp alternator. In addition, my Chevy Lumina has appr.120-Amp. I have couple friends running dual 1100 amps in a back. And you're right--it’s simply not enough for 800 CCA battery or 60+ Amp alternator.
    That is why these guys use special caps (capacitor 1 Farad) to store enough power (energy) for systems up to 1,000 total watts. I think Fosgate and nester have very interesting ideas. Thanks guys.
    Maestro MP3 player: MIS K7T Pro-2A, AMD 1.2GHz, RAM 640MB, 80G HD; Screen: Datalux 10.4 VGA; Head Unit: Kenwood Z727; RF control ON/OFF/RESET

  10. #10
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    Hey Fosgate, can you give more details on your relay setup, if possible. Can I buy them in a store? What type? For which car?
    Maestro MP3 player: MIS K7T Pro-2A, AMD 1.2GHz, RAM 640MB, 80G HD; Screen: Datalux 10.4 VGA; Head Unit: Kenwood Z727; RF control ON/OFF/RESET

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