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Car Audio Help
Wiring, Electrical & Installation
Figuring out what alts and number of batterys
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<blockquote data-quote="adulbrich" data-source="post: 8393065" data-attributes="member: 661255"><p>Alternator is the best for electrical upgrading. I was going to do a big alt setup with less batteries, thinking it would save weight, mpg, ect.</p><p></p><p>I have a 320 amp hairpin right now, and will be adding a 400 amp hairpin soon. Here is the surprising experience I&#39;ve had with batteries:</p><p></p><p>I originally had One XS D3100 under the good. My car charged between 15v and 15.2. Only at 14.8v when it was really really hot. I had one Banda 7k and dropped to 12.8v-12.9v full tilt at idle. I did not have audible belt slipping, surprisingly.</p><p></p><p>I sold my Banda 7k and bought a DD M4a. I then sold my XS D3100 and bought five Exide group 49&#39;s. With the same alternator I now charge at 14.8. The lowest I drop full-tilt at idle without clipping is 14.4v. However, the belt slips audibly when you&#39;re standing outside the car and the bass drops.</p><p></p><p>Both amps were wired to 1 ohm nominal on the same sub. I find the voltage drop weird because I thought the Banda was supposed to be wayy more efficient. Many people say that adding batteries will not solve voltage drop issues. They say batteries only help at "battery voltage", which is somewhere between 12.6v and 13.6v.</p><p></p><p>However, I think batteries do hold a little bit extra "float" voltage above their resting voltage (for a short time). Yes, they are a load to the alternator, and that explains why my overall voltage while idling is 0.2v lower. However, they did actually help with voltage drop. [USER=640058]@av83[/USER]; and I were talking about it yesterday</p><p></p><p>My battery bank is 500ah for a 7k. I would suggest adding more batteries to your bank when you add alternators.</p></blockquote><p></p>
[QUOTE="adulbrich, post: 8393065, member: 661255"] Alternator is the best for electrical upgrading. I was going to do a big alt setup with less batteries, thinking it would save weight, mpg, ect. I have a 320 amp hairpin right now, and will be adding a 400 amp hairpin soon. Here is the surprising experience I've had with batteries: I originally had One XS D3100 under the good. My car charged between 15v and 15.2. Only at 14.8v when it was really really hot. I had one Banda 7k and dropped to 12.8v-12.9v full tilt at idle. I did not have audible belt slipping, surprisingly. I sold my Banda 7k and bought a DD M4a. I then sold my XS D3100 and bought five Exide group 49's. With the same alternator I now charge at 14.8. The lowest I drop full-tilt at idle without clipping is 14.4v. However, the belt slips audibly when you're standing outside the car and the bass drops. Both amps were wired to 1 ohm nominal on the same sub. I find the voltage drop weird because I thought the Banda was supposed to be wayy more efficient. Many people say that adding batteries will not solve voltage drop issues. They say batteries only help at "battery voltage", which is somewhere between 12.6v and 13.6v. However, I think batteries do hold a little bit extra "float" voltage above their resting voltage (for a short time). Yes, they are a load to the alternator, and that explains why my overall voltage while idling is 0.2v lower. However, they did actually help with voltage drop. [USER=640058]@av83[/USER]; and I were talking about it yesterday My battery bank is 500ah for a 7k. I would suggest adding more batteries to your bank when you add alternators. [/QUOTE]
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