AMI CUSTOMS Posted April 26, 2012 Report Share Posted April 26, 2012 So I should be looking at my Amps RMS or Peak Watts when trying to dice an Alt.? 4100w RMS / 14.2v = 288.7A 288.7A + 60A (for the electrical systems) = 348.7A 8200w Peak / 14.2v= 577.5A 577.5A + 60A (for the electrical systems) = 637.5A So should I look for a 350A Alt. or like two 325A Alt's? And what size batteries should I get for the back? be worried. the info in this thread sucks so far. your math is off because you didnt factor efficiency. you need more like 470amps. dont ever ever ever ever ever ever ever, ever look at peak or max power ratings. they are useless. rms only!!! so a 250amp alt with a higher idle output than a 300amper, with two xs power 2400s plus a starting battery and you will be covered. I was thinking the same thing then scrolled down and was relieved to see at least one good response. Quote TEAM SOUNDQUBED -- TEAM SOUTH TEAM S.O.B. - Founder & Captain 3x Streetbeat World Record Holder 2017 MWSPL 1st place Mayhem & 4th Xtreme 4 2016 MWSPL 1st place Mayhem/2nd Adv 4/2nd Xtreme 4 2015 MWSPL 2nd place Mayhem & 4th Xtreme 4 2014 USACI 2nd place Streetbeat 5 - 162.6 db 2014 MWSPL 2nd place Xtreme 4 - 144.9 db 2013 USACI 1st place Streetbeat 4 - 161.9 db 2013 USACI 1st place Street Q+ - 162.8 db 2013 MWSPL 3rd Kaos2 & 4th Xtreme 4 2011 USACI 2nd place MOD 1001-2k - 160.0 db 2011 MWSPL 4th place: Adv3 - 157.8 db, Kaos2 - 150s db, Xtreme4 - 140s db 2010 ARSPL 1st place 501-750 - 160.3 db Arkansas loudest Best score to date 164.4 db - Termlab Outlaw Streetbeat 4 - 161.9 db Streetbeat 5 - 162.6 db MWSPL on Dash Legal door open (Music) - 162.5 db Sealed on dash Legal (Music) - 161.1 db - Termlab THE BLACK NASTY CURRENT BUILD & FAB The Black Nasty (6) 15 Rebuild Log 2012 (4) 15 Walled Sierra Build Log Evo X build log Facebook page The Black Nasty Link to comment Share on other sites More sharing options...
AMI CUSTOMS Posted April 26, 2012 Report Share Posted April 26, 2012 Oh and just as a reference, one of the guys on my team runs an RD D9 amp, 5k rms amp all day, off just stock 145 amp alt D3400 underhood and HC2000 next to the amp, stay above 12 volts even when clipping Quote TEAM SOUNDQUBED -- TEAM SOUTH TEAM S.O.B. - Founder & Captain 3x Streetbeat World Record Holder 2017 MWSPL 1st place Mayhem & 4th Xtreme 4 2016 MWSPL 1st place Mayhem/2nd Adv 4/2nd Xtreme 4 2015 MWSPL 2nd place Mayhem & 4th Xtreme 4 2014 USACI 2nd place Streetbeat 5 - 162.6 db 2014 MWSPL 2nd place Xtreme 4 - 144.9 db 2013 USACI 1st place Streetbeat 4 - 161.9 db 2013 USACI 1st place Street Q+ - 162.8 db 2013 MWSPL 3rd Kaos2 & 4th Xtreme 4 2011 USACI 2nd place MOD 1001-2k - 160.0 db 2011 MWSPL 4th place: Adv3 - 157.8 db, Kaos2 - 150s db, Xtreme4 - 140s db 2010 ARSPL 1st place 501-750 - 160.3 db Arkansas loudest Best score to date 164.4 db - Termlab Outlaw Streetbeat 4 - 161.9 db Streetbeat 5 - 162.6 db MWSPL on Dash Legal door open (Music) - 162.5 db Sealed on dash Legal (Music) - 161.1 db - Termlab THE BLACK NASTY CURRENT BUILD & FAB The Black Nasty (6) 15 Rebuild Log 2012 (4) 15 Walled Sierra Build Log Evo X build log Facebook page The Black Nasty Link to comment Share on other sites More sharing options...
RF4LIFE Posted April 26, 2012 Author Report Share Posted April 26, 2012 Dose anybody know the Efficency of an class AB (T8004) and a class D (T20001bd) amp? So above he used 80%, let me know if this is the correct math? 4100w RMS / 0.80(%) = 5125w Needed to get the RMS 5125w / 14.2v = 360.9A 360.9A + 60A for system = 420.9 Amp Alt. needed So for this system (@80%) I should replace the stock 130A Alt. for somthing like a 425A Alt. ? OR what do you guys think about running a compleat sepreat system? I could run a 360-375A Alt. in addition to the stock 130A Alt. and just run a compleat separate wires back to dual battery's ? Which would be better? Space is limited so I could only run 1 or 2 extra batteries? Quote Link to comment Share on other sites More sharing options...
doodcody Posted April 26, 2012 Report Share Posted April 26, 2012 mechman 270 amp alt. d6500 under the hood and 2 xp3000's in the back. monitor voltage and add another xp3000 if needed. Quote Link to comment Share on other sites More sharing options...
RF4LIFE Posted April 26, 2012 Author Report Share Posted April 26, 2012 should i run the wire/Alt./batt as a separate system than the car, or run them together? And should i replace the stock Alt. or just add to it? Quote Link to comment Share on other sites More sharing options...
doodcody Posted April 26, 2012 Report Share Posted April 26, 2012 just leave the wire as it is from the alt to front batt and then wire from the front batt to the back batt's if thats what your asking. i asked mechman if there was a dual alt bracket for my 05 explorer and he said no so i assume its the same for yours. I didnt check with the other companies. I went with a 270 amp alt from mechman, but go bigger if you can find one! Quote Link to comment Share on other sites More sharing options...
RF4LIFE Posted April 26, 2012 Author Report Share Posted April 26, 2012 should i run the wire/Alt./batt as a separate system than the car, or run them together? And should i replace the stock Alt. or just add to it? Quote Link to comment Share on other sites More sharing options...
RF4LIFE Posted April 26, 2012 Author Report Share Posted April 26, 2012 i have heard about running the two batts, amps, and the alt together in a close circuit so there is no interference with the main batt and alt? should i do that or just run them together as one big system? Quote Link to comment Share on other sites More sharing options...
doodcody Posted April 26, 2012 Report Share Posted April 26, 2012 i'd run it all together, and it seems most people on here do. I wouldn't be too worried about interference but it's up to you! Quote Link to comment Share on other sites More sharing options...
RF4LIFE Posted April 26, 2012 Author Report Share Posted April 26, 2012 ok, i have two 18 foot 1/0 awg wires should i: a. Run one as a Positive from the front Batt to the Back Batt(s) and run the other as a Negative from the front Batt to the back Batt(s) +Wire ground is always better than a Regular Frame Ground -Current draw (360.9A) may be too much for the single 1/0 awg (350A) Positive b. Run both as Positives from the Front Batt to the back Batt(s) and just do a regular frame ground +Dual 1/0 awg Positives should provide more than enough current (up to 700A) for the 360.9A needed -Regular Frame Ground may not be enough Quote Link to comment Share on other sites More sharing options...
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