Question regarding charging system
04-23-2009, 01:01 PM
#11
6th Gear Member
The NEC code has #8 AWG copper cable in air at 60, 70 and 80 amps depending on the cable type. I don't know what derating might apply in automotive applications. I'd have used #6 or possibly #4 if you could get the more flexible "locomotive" cable. You're probably getting a pretty good voltage drop at the amps on peak bass that's simply compounding the matter and causing the amps to try to draw more current.
04-23-2009, 01:22 PM
#12
2nd Gear Member
Join Date: Dec 2007
Location: Smithfield Va
Posts: 289
Glad everybody chimmed in. http://iihs.net/fsm/?dir=367&viewfil...IFICATIONS.pdf
Theres a link to factory charging specs.
Yeah I didnt say the cap produces power but it dam sure helps the effects of the bass. my cap is mounted over my amps which is where 2 subs are. Battery needed upgading any way yes a large alt will help. Hope any of this help
Theres a link to factory charging specs.
Yeah I didnt say the cap produces power but it dam sure helps the effects of the bass. my cap is mounted over my amps which is where 2 subs are. Battery needed upgading any way yes a large alt will help. Hope any of this help
04-23-2009, 01:37 PM
#13
3rd Gear Member
Join Date: Oct 2006
Location: Spring, TX
Posts: 816
I had this handy from bookmarking it a long time ago....
Here is the alternator:
http://www.pa-performance.com/Script...?idproduct=247
Here is the alternator:
http://www.pa-performance.com/Script...?idproduct=247
04-23-2009, 02:34 PM
#15
Cut & Paste Expert
Join Date: May 2007
Location: NW Arkansas
Posts: 13,322
Interesting. Well question then. Im running 80 amps (both amps combined), i have ground and power wires as 8 gauge, is there really a need to upgrade the wiring to a larger size, if i add a 400-500wrms monoblock? What about for now? Should it be upgraded from 8 gauge to something bigger if im only using 80 amps currently?
DC is different because of the
surface effect of AC voltage
is not present in DC circuits.
You want lots of current carrying
conductors for mobile DC applications.
They take the continous flexing.
500-800 conductors for 4 Guage wire is common.
Ratings following wire guage ratings are for 12.8V DC runs under 12 ft.
Longer runs need to be derated for DC current applications.
14Guage 15Amps
12G 20A
10G 30A
8G 40A
6G 55A
4G 70A
2G 85A
0G 100A
Amplifier fuse ratings are normally 5-10%
over normal operating amperage loads.
Cable from the local welding supply shop
is mighty flexable and most resistant to wear.
Put a Fluke volt meter with a min/max peak hold
function on your amplifiers positive voltage input
terminal and the other lead directly on the battery
terminal and crank up the tunes. There should
only be about a 0.5V voltage drop or less. If it is
more, a bigger wire will be needed.
Last edited by 157dB; 04-23-2009 at 02:43 PM.
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