commencal Posted March 23, 2015 Author Report Share Posted March 23, 2015 Thanks hoit, I will check xs batteries! I have a twingo of 2006 haha, So I don't think that add a other alt is possible.. But, if that is possible, how many ah or kind of batteries I should have for that system ? (With the 70a alt) Link to comment Share on other sites More sharing options...
hoit Posted March 23, 2015 Report Share Posted March 23, 2015 there's a general formula to find out how many amp hours you need vs. how many amps you are generating from the alt, minus running the rest of your electronics...I just can't think of it right now...surely someone with more knowledge will chime in...as I can never seem to learn enough as well! I've always been told...make your mistakes on someone else's clock!! 2007 Chevy Aveo Ls sedan 2 Sundown Xv2 on scv4k @ .5 ohm 2 pair RE XXX 6.5 components on sax200.4 @ 2 ohm Big Three, Three runs 1/0 power from front to back, 1 ground front to back Two runs ground from rear bank to chassis XS power d3100 upfront, 3 Odyssey 2150s in bank Singer 220 amp alt Link to comment Share on other sites More sharing options...
hoit Posted March 23, 2015 Report Share Posted March 23, 2015 Edit: I would look in to a high output alternator...never hurts...especially since most of us end up upgrading, rather than down-grading! Singer, Mechman, ...there are very reputable companies out there that will work with your needs! 2007 Chevy Aveo Ls sedan 2 Sundown Xv2 on scv4k @ .5 ohm 2 pair RE XXX 6.5 components on sax200.4 @ 2 ohm Big Three, Three runs 1/0 power from front to back, 1 ground front to back Two runs ground from rear bank to chassis XS power d3100 upfront, 3 Odyssey 2150s in bank Singer 220 amp alt Link to comment Share on other sites More sharing options...
commencal Posted March 24, 2015 Author Report Share Posted March 24, 2015 Okok, where can I found these general formula ? I looked to xs batteries site, but I don't know wich ah I need for my setup ... The most important is to have o lot of Ampers (generate by the alt) or a lot of Ah ?? I don't understand anything haha Link to comment Share on other sites More sharing options...
Skullz Posted March 24, 2015 Report Share Posted March 24, 2015 These should help you understand a bit better. 01 Ford focus ZX3 Pioneer AVH-X491BHS PPI PC 4800.2 Morel Maximo 6.5" x2 Link to comment Share on other sites More sharing options...
commencal Posted March 24, 2015 Author Report Share Posted March 24, 2015 Thank you very much for the videos, right now I begin to understand haha. So I calculate like the video: I would put 1100 w to the sundown so : 1100/0.7 = 1571 W necessary to the amp because the efficiency is 70% 1571/13 = 120.8 A necessary to do 1100W Accessory take 40%, rest 60% for the amp : With my 70A alt : 70*0.6 = 42A 120.8-42 = 78.8A, so 78.8 a.h necessary with the betteries So, just for the sundown, 78 a.h are required at minimum right ?! To calcule the a.h. needed (for consider the second amp), I just have to add 180w to 1100w ? (It deliver 180 w bridged for mediums & tweeters) . Link to comment Share on other sites More sharing options...
commencal Posted March 25, 2015 Author Report Share Posted March 25, 2015 Please ! Link to comment Share on other sites More sharing options...
Skullz Posted March 25, 2015 Report Share Posted March 25, 2015 If you need 200a of draw for the system and only have a 70a alt to power it with you'll need 130a in capacity to cover the rest and you should include some overhead to keep the voltage from dropping like a rock, i like to add 20% or so, i would get enough batteries to cover 150ah to supply your needs for the time being until you can come across a high output alternator to supply everything without worry of voltage drop. 01 Ford focus ZX3 Pioneer AVH-X491BHS PPI PC 4800.2 Morel Maximo 6.5" x2 Link to comment Share on other sites More sharing options...
commencal Posted March 25, 2015 Author Report Share Posted March 25, 2015 Okay so my alt and a total sum of 150 ah for the batteries would be fine ? Link to comment Share on other sites More sharing options...
Skullz Posted March 25, 2015 Report Share Posted March 25, 2015 Yeah, but you really do want a high output alt as it makes the power and the batteries store the power. 01 Ford focus ZX3 Pioneer AVH-X491BHS PPI PC 4800.2 Morel Maximo 6.5" x2 Link to comment Share on other sites More sharing options...
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