Results 1 to 10 of 10

Thread: Dual alternators

  1. #1
    Newbie
    Join Date
    Feb 2009
    Location
    New York
    Posts
    17

    Exclamation Dual alternators

    Has anyone run a dual alternator setup? Wouldn't it be a better setup to run the pc from its own electrical source instead of the unit attached to the battery?

  2. #2
    North of the land of Hey Huns
    Auto Apps:loading...

    Join Date
    Jun 2004
    Location
    Westminster, MD
    Posts
    2,127
    Quote Originally Posted by chipmaster View Post
    Has anyone run a dual alternator setup? Wouldn't it be a better setup to run the pc from its own electrical source instead of the unit attached to the battery?
    We run them at work, and in my opinion, you would not gain much if anything by running a separate electrical system. Get a decent power supply, good grounding, and big enough power cables and you won't have to worry about interference.

  3. #3
    Variable Bitrate Uraijit's Avatar
    Join Date
    Aug 2007
    Location
    Utah
    Posts
    305
    Quote Originally Posted by chipmaster View Post
    Has anyone run a dual alternator setup? Wouldn't it be a better setup to run the pc from its own electrical source instead of the unit attached to the battery?
    Absolutely not! The battery works as a bit of a line conditioner. If anything, get a separate battery and a battery isolator, but don't go straight from an alternator to a PC.
    Greedy
    -Adj.
    Anybody who makes significantly more money than you do.

    The Hoe-Puter Worklog

    Progress (Phase one):

    Planning:
    [----------] 97.3%
    Parts Aquisition:
    [----------] 95%
    Install:
    [----------] 95%

  4. #4
    Newbie
    Join Date
    Feb 2009
    Location
    New York
    Posts
    17
    I was thinking of running another battery and alternator to just power the pc and any other electronics.

  5. #5
    Variable Bitrate Uraijit's Avatar
    Join Date
    Aug 2007
    Location
    Utah
    Posts
    305
    Unless you're running a big honking sound system, the second alternator is overkill.

    Think about it. What's your max PSU output? 150 watts? so divide the wattage by the voltage (13.2Vdc). If you MAX OUT your PSU, you're still only drawing 11.5 amps. In reality, you'll probably never draw more than half that, unless you're gaming while majorly overclocking some water-cooled system with a crazy graphics card, while ripping DVDs and streaming music...

    Like I said, if you want, you could throw a deep cycle battery in with an isolator, and call it good. But even that is probably unnecessary.

    Take the money for the alternator setup, and put it towards a new Core i7 or a Blueray burner.
    Greedy
    -Adj.
    Anybody who makes significantly more money than you do.

    The Hoe-Puter Worklog

    Progress (Phase one):

    Planning:
    [----------] 97.3%
    Parts Aquisition:
    [----------] 95%
    Install:
    [----------] 95%

  6. #6
    Variable Bitrate
    Join Date
    Nov 2006
    Location
    Rubidoux, CA
    Posts
    241
    Definitely just go with an isolated battery system if you want. The second alternator would just provide a separated noisy 12V to your computer, instead of the built-in noisy 12V. A second battery and isolator on the other hand, will provide another sink for that noise, and help calm the noise down a bit. If you still are unsatisfied, you can add a CAP at the PC/Amp to absorb any noise that is left.
    2000 Ford Expedition Eddie Bauer - Bi-Fuel Gasoline/CNG
    Intel D945GCLF2 w/512MB RAM, CL Audigy w/KxProject, M2-ATX, Lilliput EBY701

  7. #7
    CwF
    CwF is offline
    Newbie
    Join Date
    Jun 2008
    Location
    Denver(ish)
    Posts
    30
    Aux Alternators should be tied in the main system. On mine the computer fields the alternator only when needed. Aux batteries should be relayed not isolated. And yes, batteries are the best filter and the only reason the system is DC.
    06 Silverado LBZ wants onboard everything...

  8. #8
    Maximum Bitrate albysure's Avatar
    Join Date
    Dec 2000
    Location
    pittsfield, ma.
    Posts
    685
    i always used an isolator in my audio system. there is at least a .7 volt drop across the isolator though. i work at an armored vehicle builder and all we use in our swat trucks is a isolator circuit that uses a large solenoid. the company is called kussmaul and they have some neat stuff. on their website, they list these as 2 separate parts but there is a kit part number also. it goes for about $140. definently better than an isolator. and yes, i will upgrade this summer.

  9. #9
    CwF
    CwF is offline
    Newbie
    Join Date
    Jun 2008
    Location
    Denver(ish)
    Posts
    30
    Exactly, that large 'solenoid' is actually a continuous duty relay. 'Isolators' use diodes, always accompanied by the needless voltage drop and resulting inaccurate voltage regulation. You can just buy the relay for $20-40. Many to choose from.
    06 Silverado LBZ wants onboard everything...

  10. #10
    Variable Bitrate
    Join Date
    Nov 2006
    Location
    Rubidoux, CA
    Posts
    241
    Depends on the alternator you use. Some alternators have a remote sense line, which can be hooked up to an isolator's 'sense' terminal, which will feed the dropped voltage back to the alternator for regulation purposes, resulting in the alternator outputting the extra .7 volts. Relays are a nice way around having to do this, but lack the reliability of a good isolator.

    Some other systems already sense the voltage at the Battery (most 98 and newer Fords do this I believe), thereby eliminating the problem from the start.
    2000 Ford Expedition Eddie Bauer - Bi-Fuel Gasoline/CNG
    Intel D945GCLF2 w/512MB RAM, CL Audigy w/KxProject, M2-ATX, Lilliput EBY701

Similar Threads

  1. Core Duo / Core 2 Duo Mini-ITX boards
    By RedGTiVR6 in forum General Hardware Discussion
    Replies: 153
    Last Post: 10-03-2010, 10:30 PM
  2. Dual Audio... Again - The Chiken or the Egg?
    By Robert_IT in forum Newbie
    Replies: 2
    Last Post: 02-28-2008, 04:58 PM
  3. Is there 184 pin dual channel DDR RAM?
    By Maheriano in forum General Hardware Discussion
    Replies: 1
    Last Post: 01-05-2007, 05:02 PM

Bookmarks

Posting Permissions

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