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Raising voltage
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<blockquote data-quote="psychoacoustics" data-source="post: 6371958" data-attributes="member: 584032"><p>you cant raise voltage you unless you get 16 volt batteries and an externally regulated alternator</p><p></p><p>how ever you can prevent voltage drop.</p><p></p><p>voltage drop is a product of resistance if you have 1 run of wire a factory alt and 2 dissimilar batts your on the right track for voltage drop</p><p></p><p>first step is to replace factory battery dissimilar battery's do what's called parasitic discharge, that means that they discharge into each other trying to achieve equilibrium and will continue until they die</p><p></p><p>second step is to do a wire upgrade for your alt and grounds (big 3) i know you dont want to but its the only option do it or have votage drop no way around it</p><p></p><p>if you plan on doing more runs of 1/0 the next one should be a ground from front battery to back battery</p><p></p><p>and from that point on do equal number of runs per + and - terminals having a bunch of +++++ and only 1 - is going to make voltage drop too</p><p></p><p>then like all the other guys do more batteries in the back</p><p></p><p>if you plan on using a 2-3kw amp just do the math on how long you can sustain the voltage</p><p></p><p>look here</p><p></p><p><a href="http://www.gizmology.net/batteries.htm" target="_blank">http://www.gizmology.net/batteries.htm</a></p><p></p><p>plus if you have a 2kw amp and a 150 amp alterntor when your amp is being used to full power you will get somewhere around 2100 watts</p><p></p><p>150*14=2100</p><p></p><p>so if your not using anything except the ignition you should bet very little time before you get drop</p><p></p><p>but you have a radio dashlights ignition computers headlights whatever</p><p></p><p>with your battery you should get about 45 min until its dead at full tilt but music is dynamic so double that time 1.5 hours best guess</p><p></p><p>now add a second battery and a 250 amp alt</p><p></p><p>250*14=3500 watts</p><p></p><p>136*2= 272ah</p><p></p><p>1.4 hours of battery life and now you got 1500 watts to pump back in to the battery but eventually your alternator will saturate with heat and not keep that up</p><p></p><p>this is all perfect conditions and with no voltage drop over your cables</p><p></p><p>if your batterys are less than 1 foot from your amp your good if not you need more wire</p><p></p><p>any meter will show voltage drop digital 3$ or 20 year old analog all the same , put the meter in the wire right at the terminal of the amp and play the system what is the lowest number you see ?</p><p></p><p>now turn stereo off and put it at the front battery and rev the engine a bit what is the highest number you see ?</p><p></p><p>subtract the 2 that is your voltage drop with the alternator on</p><p></p><p>now turn the car off and do it again same place amp at full tilt and front battery that is voltage drop without the alternator</p><p></p><p>long story short you need power to make power</p></blockquote><p></p>
[QUOTE="psychoacoustics, post: 6371958, member: 584032"] you cant raise voltage you unless you get 16 volt batteries and an externally regulated alternator how ever you can prevent voltage drop. voltage drop is a product of resistance if you have 1 run of wire a factory alt and 2 dissimilar batts your on the right track for voltage drop first step is to replace factory battery dissimilar battery's do what's called parasitic discharge, that means that they discharge into each other trying to achieve equilibrium and will continue until they die second step is to do a wire upgrade for your alt and grounds (big 3) i know you dont want to but its the only option do it or have votage drop no way around it if you plan on doing more runs of 1/0 the next one should be a ground from front battery to back battery and from that point on do equal number of runs per + and - terminals having a bunch of +++++ and only 1 - is going to make voltage drop too then like all the other guys do more batteries in the back if you plan on using a 2-3kw amp just do the math on how long you can sustain the voltage look here [URL="http://www.gizmology.net/batteries.htm"]http://www.gizmology.net/batteries.htm[/URL] plus if you have a 2kw amp and a 150 amp alterntor when your amp is being used to full power you will get somewhere around 2100 watts 150*14=2100 so if your not using anything except the ignition you should bet very little time before you get drop but you have a radio dashlights ignition computers headlights whatever with your battery you should get about 45 min until its dead at full tilt but music is dynamic so double that time 1.5 hours best guess now add a second battery and a 250 amp alt 250*14=3500 watts 136*2= 272ah 1.4 hours of battery life and now you got 1500 watts to pump back in to the battery but eventually your alternator will saturate with heat and not keep that up this is all perfect conditions and with no voltage drop over your cables if your batterys are less than 1 foot from your amp your good if not you need more wire any meter will show voltage drop digital 3$ or 20 year old analog all the same , put the meter in the wire right at the terminal of the amp and play the system what is the lowest number you see ? now turn stereo off and put it at the front battery and rev the engine a bit what is the highest number you see ? subtract the 2 that is your voltage drop with the alternator on now turn the car off and do it again same place amp at full tilt and front battery that is voltage drop without the alternator long story short you need power to make power [/QUOTE]
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