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High-Amp Alternator Questions

Discussion in 'The Garage' started by DPI, Dec 10, 2002.

  1. DPI

    DPI 1/2 ton status

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    Little background, I have a dual battery setup (HellRoaring), a 12,000 lbs winch, 4-hi-output aftermarket 100 watt headlights, stereo and I currently have a 105 amp factory alternator....
    As the subject says:
    How high amperage is high enough?
    Do I really need a 200 amp alternator?
    What are the benefits and or detriment to having one?
    Has anyone used this company? www.alternatorparts.com and specifically this duel rectifier alternator?
    [​IMG]
     
  2. TX Mudder

    TX Mudder 1/2 ton status

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    Wow, and I thought my 100 amp 1-wire alt was plenty.
    I have heard that the big amperage alts only put out that much juice with high rpm and that at low rpm put out less than dinky 65 amp ones.
    I would guess that a 200 amp unit would only attenuate the low rpm charging.
    -- Mike
     
  3. Skigirl

    Skigirl 1/2 ton status

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    Grimmy had a response to a post a while back that covered amperage at lower rpms. Might help to search his posts.

    I just put in a 170, and according to Grim, might have gone with a particular brand that had higher amps at lower rpm. The details were in that post he made - maybe a month or 2 ago.
     
  4. DPI

    DPI 1/2 ton status

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    Thanks for the reponses. I will do another search. Must have missed it the first time. /forums/images/graemlins/confused.gif
     
  5. Skigirl

    Skigirl 1/2 ton status

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    Prolly be easier just to search Grim's posts instead of by subject.
     
  6. Sandman

    Sandman 3/4 ton status Author

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    Well, each light will suck around 8 amps of juice. Figure 100 watts/ 12 volts or so = about 8 amps. So the lights will suck around 32 amps. Sounds like you should be fine for general use. The winch can change everything. Depends on how much you use it. I run a dual battery with a 105 amp alternator and it works well for me. I can winch quite a bit before I have to take a break.
     
  7. VisionxOrb

    VisionxOrb 1/2 ton status

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    I run there 200 amp alt but not the dual rectifer model. I have 4 130 watt procomps 3 55w foglights and a HUGE stereo. my Orion HCCA 2100 can pull 150 amps just buy its self ( running 1 ohm mono killed 2 autozone alts with this thing in 2 days ). I put the 200 amp in and its worked good ever since. can run everything and keep the vots at 13.5 at my fuse box.
     

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