kryptonite Posted March 13, 2009 Report Share Posted March 13, 2009 if i had a battery that sat at only 12.2v, i would be concerned it was damaged.....12.6-12.8 is normal and 13-13.2 is outstanding in my experience. also, i too have seen people solve headlight dimming by adding batteries, it really depends on how much power you are drawing, of course everyone wont experience the same thing, especially in the car audio world .....for me though, i have ZERO headlight dim at full power, HID's FTW I'm with steve on this one, HIDs are gettin ordered in april, Happy Birthday to ME! DC SOUND LAB NUT HUGGERCurrently Own 4 - 18" lvl 6s (m3) w/full Carbon Fiber option 2 - DC 5k lvl 4 motor lvl 2 motor On 8/2/2013 at 8:13 PM, n8ball2013 said: this is much worse. Its old n8 without the time or patience to hold fucking hands. I'm supposed to be doing school work but yet here i am making sure jr fuck fuck isn't trying to poke the other kids with a stick. Link to comment Share on other sites More sharing options...
kentb Posted March 13, 2009 Report Share Posted March 13, 2009 in some cases adding a battery does help. ex you have a stock battery and a stock amp. using a sundown 3000d. of course you will have mad voltage drop, maybe 11v(just a rough example) then you add a big kinetik hc3800 in the back. that will definitely help in the voltage drop(as long as the battery is still charged) may be 12.5v(again just a rough example). you know what i mean? New System 2 10" Fi SSD, Sundown 1500d Build I build and design enclosures(cheap price), PM ME Kicker L7 Navigator(plexiglass, fiberglass, aeroport) Build BTL 18" Escalade(plexiglass, battery tray) Build http://www.kentbaudio.com Old System Link to comment Share on other sites More sharing options...
wL<3bass Posted March 13, 2009 Report Share Posted March 13, 2009 .....for me though, i have ZERO headlight dim at full power, HID's FTW That's the main reason I got mine that and the fact that they are much better for these twisty-turny deer-ridden backroads here Vehicle: 1997 S10 Blazer 4dr 4X4 Exterior: Rear End Bagged, Black Grill, Lifted 2" Amplifiers: Rockford Fosgate T8004 & T10001bd Batteries: 2 Stinger SPV35, Kinetik HC2400 Electrical: Big 3, DC Power 290amp Alternator w/ MLA at 15.5v Enclosure: 4.2 ft³ @ 33Hz 84sq.in. of port (20sq.in. per cube) Headunit: Eclipse CD3200 w/ 80G iPod Mids/Highs: Rockford T152s (a-pillars), Rockford T162s (doors) Subwoofers: 1 15" Fi BL Fully Loaded Wire: All 1/0g Kicker Hyperflex My YouTube Videos My Fiberglass A-Pillar Build My "Seamless" Looking Box Build My DD1508 T-Line Bandpass Build "Seamless" w/ Acrylic Windows (for '05 TrailBlazer) My Stealth 8" Fiberglass Build (for '05 TrailBlazer) My Build For A Friend's '08 Cobalt 15" BL Sealed Off From The Trunk My feedback/references... Link to comment Share on other sites More sharing options...
Boon Posted March 13, 2009 Author Report Share Posted March 13, 2009 in some cases adding a battery does help. ex you have a stock battery and a stock amp. using a sundown 3000d. of course you will have mad voltage drop, maybe 11v(just a rough example) then you add a big kinetik hc3800 in the back. that will definitely help in the voltage drop(as long as the battery is still charged) may be 12.5v(again just a rough example). you know what i mean? Oh yeah it'll help for sure, if you're dropping below 12v then batteries will help. But you'll still be dimming because you're dropping below the 14.4v of your alt anyway As I said somewhere above, open-circuit voltage is about 2.15v/cell or 12.9v for a 12v battery. It just drops as soon as you load it AGMs can be a little different, they have stonger acid IIRC which mixes things up a bit. 10.x volts fo' life! Link to comment Share on other sites More sharing options...
slugdub Posted March 17, 2009 Report Share Posted March 17, 2009 Well how do you figure out how much amperage the amp is pulling then? I would imagine its less than the in-line fuse size you are using (duh) so if I've got 1 amp drawing around 50 or 60 amps tops, I can't justify putting a battery in the back anyhow. I guess I should try to find a beefier alternator or does everyone use modded ones now? Link to comment Share on other sites More sharing options...
slugdub Posted March 17, 2009 Report Share Posted March 17, 2009 Nevermind, I think I found the formula. Still adds up to well over the 120A i'm putting out. Hmm Link to comment Share on other sites More sharing options...
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