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Thread: Isolator what size do i need?

  1. #11
    Newbie jfxwave's Avatar
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    As of right now i have just the stock 1 battery but i have 2 new Optima batteries (8040-218) and i wish it was diesel but it has a V10 6.8. At the time i bought it my wife took her brothers 3 kids in (CPS) and i had a Porsche and Winstar and traded that Winstar in and got this Ford Excursion to haul them 3 plus my 3 kids. I have 17' of 0g to run from front to back to the dblock then 4g to split of to each amp. Alternator i got on line on eBay but i couldn't find the one that i got but it's like this one but made for a 2004 http://cgi.ebay.com/ebaymotors/00-01...item2eb21e536a and that is already installed.

  2. #12
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    Bugbyte's Avatar
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    Okay, I'm still not getting it. You have a 250 amp alternator and a 500 amp sound system. When you turn up your volume, the battery should drain and the light should dim until the battery goes dead. End of story.

    What am I not getting here? The power to the amps comes from the alternator + battery. If you pull more than the alternator can supply, the battery supplies the rest until drained.

    If your battery is not routinely going dead, you aren't pulling near the amperage you think you are which means you are over fused.

    ---------- Post added at 10:54 PM ---------- Previous post was at 10:30 PM ----------

    Just received this from the O.P.:

    "post
    If you would read number 5 i said NEW STILL IN BOX NOT IN TRUCK thats way i'm asking for help to make sure i'm good on power. Plus even if it's 500 amps it will not pull near that amount.

    Now why did that post get closed?"

    -->I have no idea how it got closed. I didn't do it. Sorry to wreck your post. Good luck with your system.
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    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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  3. #13
    Newbie jfxwave's Avatar
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    Okay, I'm still not getting it. You have a 250 amp alternator and a 500 amp sound system. When you turn up your volume, the battery should drain and the light should dim until the battery goes dead. End of story.

    What am I not getting here? The power to the amps comes from the alternator + battery. If you pull more than the alternator can supply, the battery supplies the rest until drained.
    I'm sorry if you miss post number 5 but i said my system is still new in the box and thats why I'm asking what i need for power. I don't believe it will pull nearly 500 amps plus I'm working off the fuses that the amps have and if i did pull that much the fuses will pop. All i was trying to find out will the isolator i got work and Oldspark answered my question.

  4. #14
    Newbie jfxwave's Avatar
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    @Bugbyte I'm sorry that i was harsh and i do thank you for your help but when i seen your last post and went to reply and seen it was closed --> you know how i must have felt.
    I don't know whats wrong with this thread but it keeps open/closing.

    Thanks for everyones help

  5. #15
    Raw Wave
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    Buggy - you fuse & dimension to the load, hence 500A etc.

    Whether the alternator (250A) can supply the FULL load full-time, or half volume (1/4 load), is a separate issue.


    PS... I too am perplexed by closed threads... no right of clarification?
    Good to see this one re-opened.
    And hopefully clarified.
    Last edited by OldSpark; 02-25-2011 at 11:37 AM. Reason: PS...

  6. #16
    FLAC PhilG's Avatar
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    @jfxwave. Can you post the quantity/ brand/ model numbers of your amps? Let's start from there because the numbers you are suggesting seem like a heck of a pile of power like you want to compete in SPL or something. (Heck, maybe you do?)
    My 2007 Ford F350 Work Log located HERE

  7. #17
    Raw Wave
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    Don't forget to add the battery's recharge current to the load.

    Normally that's the max recharge current which depends on depth of discharge and voltage supply (at the terminals), but provided the recharge current curve is withing the current capability (curve) of the relay...

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