enough charging capacity - 1 more amp

Discussion in 'Car Audio, Electronics & Security' started by Chuck71RS, Jun 10, 2019.

  1. Chuck71RS

    Chuck71RS Veteran Member Lifetime Gold Member

    Messages:
    1,397
    Likes Received:
    169
    Joined:
    Nov 24, 2012
    Location:
    Houston, Texas
    Want to add a third amp of 25 watts (+/-) per channel but don't know if the electrical system has enough charging capacity

    Alternator - 61 amps

    Electrical draw
    Stereo - 2 amps, 35watts (0.5% thd) per channel (140 watts max)
    Air Conditioning
    Wipers
    Lights - all LED except headlights
    headlights
    tac
    fuel gauge
    oil pressure gauge
    temp gauge

    Is there enough capacity?
     
  2. dave@ztech

    dave@ztech Veteran Member Lifetime Gold Member

    Messages:
    3,328
    Likes Received:
    687
    Joined:
    Mar 27, 2016
    Location:
    NY
    will be interested in the answer, as I am wondering the same thing
     
  3. Coadster32

    Coadster32 Veteran Member Lifetime Gold Member

    Messages:
    1,611
    Likes Received:
    129
    Joined:
    Oct 2, 2013
    Location:
    Milford,CT
    This may not give you a definitive answer, but here's a bit of fat to chew on. ( I'm not an expert by any means, so keep the mud slinging down please) :crazy:

    Watts=volts x amps....12volt system x 61 amp alternator = 732 total amps. (Some may say 14 volts charge, then you're 854).

    One thing I don't get is a 2 amp stereo with 140 watt capacity in a 12 volt car. That doesn't add up.:screwup: Probably has a 15 amp fuse.:smokin:

    You can try it, and see if you're headlights dim, (just like back in the late 80's). If they do, then just get a bigger alternator. No sweat.
     
    Chuck71RS likes this.
  4. Chuck71RS

    Chuck71RS Veteran Member Lifetime Gold Member

    Messages:
    1,397
    Likes Received:
    169
    Joined:
    Nov 24, 2012
    Location:
    Houston, Texas
    The two amps were after market Kenwood installed in 1986 but they still play clean. Both are connected to the 1986 installed Kenwood eq, which is connected to a modern head unit.
     
  5. rchydzik

    rchydzik Veteran Member Lifetime Gold Member

    Messages:
    831
    Likes Received:
    22
    Joined:
    Nov 13, 1999
    Location:
    Colbert, WA USA
    If your voltage is ok, you are fine. If the alternator cannot supply the amperage, the voltage will drop below 12 under high load and the battery will pick it up. Idle is where you might have a problem.
     
  6. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

    Messages:
    26,899
    Likes Received:
    909
    Joined:
    Feb 26, 2004
    Location:
    Bloomington, MN
    It will be fine.

    Those amps are rated at peak power (usually shifted to one channel) then they multiply by four channels.

    I’m amping more than that with a stock alternator.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.