Closed Thread
Results 1 to 14 of 14

Reload Thread: watts per amps ?

  1. #1
    cdc351jeferson's Avatar
    cdc351jeferson is offline CarAudio.com Elite



    Join Date
    Jul 2012
    Location
    austin tx
    Posts
    1,658
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    693 Post(s)

    watts per amps ?

    how many watts per amps is good is there a formula im missing. got a 125 amp alt whats most watts you would wanna run off it ?







  2. #2
    ab18vfl's Avatar
    ab18vfl is offline Member



    Join Date
    Jul 2012
    Location
    Rochester, NY
    Posts
    45
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    20 Post(s)

    Re: watts per amps ?

    idk, theres always that guy that'll have the formula to figure it out.

    I, Personally won't wanna run more than 2000rms on any stock alternator safely. So, i'd say 2k with good battery power.



    2005 Subaru Impreza 2.5rs
    Head Unit- Kenwood Excelon KDC-X695
    Front doors- Rockford Prime 6.5" components
    Rear doors- Rockford Punch 4" coax's
    Amp- DC 2.0K
    Subs- Audioque HDC3 12" D1
    Box- TBA

  3. #3
    chillin's Avatar
    chillin is offline CarAudio.com Elite



    Join Date
    Jan 2007
    Location
    Whistler, Canada
    Posts
    1,802
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    201 Post(s)

    Re: watts per amps ?

    It depends on how much your car uses. Do you have power windows, A/C, navigation, etc? Many factors make a difference including efficiency of the amp. A/B amps will be far less efficient



    Children are the future… today belongs to me!

  4. #4
    cdc351jeferson's Avatar
    cdc351jeferson is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Jul 2012
    Location
    austin tx
    Posts
    1,658
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    693 Post(s)

    Re: watts per amps ?

    well ill be running a jl slash 1000watt a double din deck and the normal ac and power windows. but would like to upgrade to a larger amp maybe 3k to push some sundown z's maybe . just wondering before i buy currently thinking of running 2 sa15's off the jl which electrical should be plenty for that




  5. #5
    ab18vfl's Avatar
    ab18vfl is offline Member



    Join Date
    Jul 2012
    Location
    Rochester, NY
    Posts
    45
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    20 Post(s)

    Re: watts per amps ?

    stock alt, kinetik 1200 would be fine



    2005 Subaru Impreza 2.5rs
    Head Unit- Kenwood Excelon KDC-X695
    Front doors- Rockford Prime 6.5" components
    Rear doors- Rockford Punch 4" coax's
    Amp- DC 2.0K
    Subs- Audioque HDC3 12" D1
    Box- TBA

  6. #6
    cdc351jeferson's Avatar
    cdc351jeferson is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Jul 2012
    Location
    austin tx
    Posts
    1,658
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    693 Post(s)

    Re: watts per amps ?

    fine for 3k ?




  7. #7
    Join Date
    Jan 2007
    Location
    any wet spot i can find
    Posts
    3,282
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1188 Post(s)

    Re: watts per amps ?

    Quote Originally Posted by cdc351jeferson View Post
    fine for 3k ?
    fine for the system you have was implied, i m sure.




    "Bailout: Taking a trillion dollars from the people and giving it to the banks so the banks can loan it back to the people, at interest!"

  8. #8
    Join Date
    Jan 2007
    Location
    any wet spot i can find
    Posts
    3,282
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1188 Post(s)

    Re: watts per amps ?

    Quote Originally Posted by cdc351jeferson View Post
    how many watts per amps is good is there a formula im missing. got a 125 amp alt whats most watts you would wanna run off it ?
    125 amps * 14.4 volts = 1800 watts




    "Bailout: Taking a trillion dollars from the people and giving it to the banks so the banks can loan it back to the people, at interest!"

  9. #9
    Join Date
    Jan 2007
    Location
    any wet spot i can find
    Posts
    3,282
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1188 Post(s)

    Re: watts per amps ?

    By the time you were to calculate in the stock electrical requirements at night in the summer at 70 mph, you do not leave very much for an aftermarket audio system.




    "Bailout: Taking a trillion dollars from the people and giving it to the banks so the banks can loan it back to the people, at interest!"

  10. #10
    cdc351jeferson's Avatar
    cdc351jeferson is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Jul 2012
    Location
    austin tx
    Posts
    1,658
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    693 Post(s)

    Re: watts per amps ?

    thansk for everyones input ill run my 1000watts for now with big 3 and a batt in the trunk until i upgrade alt i this system isnt loud enough




  11. #11
    Imtjnotu's Avatar
    Imtjnotu is offline Me Gusta Edition



    Join Date
    Nov 2006
    Location
    San Diego CA
    Posts
    12,530
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1548 Post(s)

    Re: watts per amps ?

    Quote Originally Posted by chillin View Post
    It depends on how much your car uses. Do you have power windows, A/C, navigation, etc? Many factors make a difference including efficiency of the amp. A/B amps will be far less efficient
    also depends on the battery and how efficient the amp is....i run 2k on just a single batt and 120 amp alt




  12. #12
    cdc351jeferson's Avatar
    cdc351jeferson is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Jul 2012
    Location
    austin tx
    Posts
    1,658
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    693 Post(s)

    Re: watts per amps ?

    im running a jl slash 1000v2 withh be running 2 15sa




  13. #13
    keep_hope_alive's Avatar
    keep_hope_alive is online now Acoustics Engineer keep_hope_alive is a Supporting Member of the forum!



    Join Date
    May 2007
    Location
    Quad Cities, IL
    Posts
    6,052
    Post Thanks / Like
    Images
    28
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    1161 Post(s)

    Re: watts per amps ?

    the equation you want is called Ohm's Law. my sig has the equation.

    to figure out current drawn at a given amplifier power output you need to know the amplifiers efficiency at that power level. You also need to know battery voltage (which varies car on/off and changes with voltage drop from load)

    Wattage (output) / Efficiency (%) = Power input.

    Current drawn = Power input / Battery voltage

    If 80% efficient.
    1000/.8 = 1250 Watt consumed

    if 13.5VDC
    1250/13.5 = 92.6 A DC

    but that current would only be for an instant with music. Average music power is MUCH less than Peak music power (the difference is referred to as Crest Factor in dB).

    simply put - a good front battery is important to maintain >12.6 VDC.
    a high output alternator is required to maintain >14 VDC

    size of the alternator depends on the load and habits.

    I recommend you have a volt meter installed in the dash so you can monitor battery voltage. if it ever drops below 12.3 VDC you should turn the volume down and let the batteries recharge.



    have you been helped by me? i'd love to know. shoot me a PM.

    My 2014 Accord build log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/608637-2014-accord-sport-sq-build-keep_hope_alive.html
    ***My YouTube Channel https://www.youtube.com/channel/UCkYUo2EShW9lgtrfXiDvLNQ/videos
    *My 2001 Accord build log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/536049-2001-accord-ex-sedan-its-long.html
    *2005 Scion tC Build Log: http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/516096-2005-scion-tc-sq-hertz-audison-pioneer-build-log.html

  14. #14
    cdc351jeferson's Avatar
    cdc351jeferson is offline CarAudio.com Elite

    Threadstarter


    Join Date
    Jul 2012
    Location
    austin tx
    Posts
    1,658
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quoted
    693 Post(s)

    Re: watts per amps ?

    yea i know ohms law i jsut wanted opinions on what has been done before. not to worried about amp frying can put out 1000watts at 11votls . and if alt fries well thats my dumb fault excellent formulas and info hope appreciate your input . i should be doing well with a batt in trunk and 1000watts on stock setup :P




Closed Thread

Similar Threads

  1. WTB: 4 channel amp, 70 watts per at 4 ohm
    By chuckster in forum Wanting to Buy (WTB) - Car Audio
    Replies: 10
    Last Post: 11-02-2009, 11:04 AM
  2. Replies: 34
    Last Post: 12-29-2008, 11:18 PM
  3. wtb 2 channel 100-150 watts per channel at 2 ohm amp
    By 05fronty in forum Wanting to Buy (WTB) - Car Audio
    Replies: 5
    Last Post: 10-27-2008, 09:08 PM
  4. WTB: 4 channel amp 50-100 watts per channel
    By Scoobydoo in forum Wanting to Buy (WTB) - Car Audio
    Replies: 1
    Last Post: 05-17-2006, 12:41 AM
  5. What amp powers 4 Orion 12" H2 1500 watts per sub
    By Killacash in forum Amplifiers
    Replies: 5
    Last Post: 02-10-2005, 08:04 PM

User Tag List

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts
1e2 Forum