12 volt DC inverter to power car stereo

Discussion in 'Electrical Systems' started by Chuck71RS, Dec 12, 2020.

  1. Chuck71RS

    Chuck71RS Veteran Member Lifetime Gold Member

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    Can a 12 volt DC inverter be connected to power the car stereo while in the garage without the engine running? If so how?
     
  2. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Complete the stereo wiring to the car and connect a battery charger to your car battery.

    If you don’t have a battery in the car...

    The power and “memory” connections can be made to any 12V DC source (and stereo ground) but I have no idea what type of connections the inverter has.

    What, exactly, are you trying to do?
     
  3. Chuck71RS

    Chuck71RS Veteran Member Lifetime Gold Member

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    Be able to play the car stereo while in the garage without the engine running.
    Would such use shorten the life of the battery?

    With battery disconnected could the hot lead from a battery charger be connected to the positive cable and the battery negative cable end attached to the negative lead going to the charger?
     
  4. biker

    biker Veteran Member

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    Leave everything wired as is, and just keep a battery tender or other similar small electronic automatic maintainer connected to the battery all winter. I guess that is exactly what Terry said above. Battery tenders are great for the battery, and the little draw the stereo puts on the battery will give it something to do.
     
  5. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Yes, that should work as long as your stereo amps aren’t drawing more power than the charger can provide.

    I would just connect the charger to the battery when you want to play the stereo and leave it on for a while afterwards to keep a good charge.
     
  6. Chuck71RS

    Chuck71RS Veteran Member Lifetime Gold Member

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    Thanks guys. Will leave all wiring connected and attach the battery charger when I want to play the stereo in the garage.
    I have a 1 amp fully automatic maintainer which is only good for 12 watts so will use the battery charger and the 10 amp setting.
     
  7. jeff swisher

    jeff swisher Veteran Member

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    I would not do the 10 AMP setting unless you have it cranked way up loud.
    You can overheat a battery with a 10 amp charger believe it or not.

    Now if your charger has a gauge on it you could hook it up to the low output and hook to the car battery wires
    with battery disconnected and see how many amps it is pulling.

    I ran a small 12 volt 7 AH battery from a cash register for over 20 hours with a car stereo powering two 5 1/4" pioneer speakers.
    I had it mounted in an old plastic tool box.
    Homemade boom box.
    Had a small 50 watt Realistic amp in it also.
     
  8. Chuck71RS

    Chuck71RS Veteran Member Lifetime Gold Member

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    Thanks Jeff. What I was wanting to do is not simple and the potential for a disaster is to great. Will give up on the idea
     
  9. Ihada70Z28B4

    Ihada70Z28B4 Veteran Member

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    Usually an automotive battery charger does not have clean enough DC, but some do.
     
  10. jeff swisher

    jeff swisher Veteran Member

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    Most car radios will run with just the charger hooked to them.
    What was the exact plan?
    I had a home stereo in my room as a kid and it had minimal power.
    I got a car amplifier and wired the speaker wires from the speakers to the amp and then out of the amp into the speakers.
    I then had a small car battery in a box I used to power the amp.
    It would last over a week before it needed charging.
    Actually did not need it but i figured i would charge it.. The battery was still working fine after a week of use a few hours a day.
    I had 4 speakers hooked to it.

    A cheap lawn mower battery will work for quite a while.
    Some battery chargers will induce a whine sound into a system if all you had was the charger.

    I am still curious as to your exact plan.
     

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