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<blockquote data-quote="brian84corvette" data-source="post: 8305175" data-attributes="member: 586635"><p>if 2 alts are not enough - you can make up the diffrence in ( good ) batterys. - a good battery is low esr - to give off and take back in power at a faster rate than most batterys can.</p><p></p><p>the math formula of 100w to 10 amps is pretty good at rough guess on requirments</p><p></p><p>mid 12 volts is still acceptable. its anything under 12 volts is where it gets scarry with things getting burnt up.</p><p></p><p>the guys with big systems are not keeping above 13.5v playing full tilt unless they have an un limited budget to work with...</p><p></p><p>most normal people on a budget drop in the 12s and we are fine...</p><p></p><p>with my ddm2a (2500w @.5 ohm ) and my pair of mb quart discus 4 chans ( 1k each amp ) i was droping to 13s flat in my setup - and i believe thats because all 4 of my batterys will "rest" at 13.0 volts after a few days of the truck not being on - but there is a thing called float charge - where a battery will hold in the 13.75 + range as the alternator is putting 14.4 to 15.0 volts out - for a few seconds after that charge stops the batterys keep this float voltage and thats whats feeding the amps as heavy bass lines hit that drop voltage badly.</p><p></p><p>my singer alt charges at 15.0 volts ( its a bad to the bone unit ) so when im blasting and the voltage starts to drop - from 15.0 down to 13.75 volts is being fully fed by the alternator.. the batterys are there - but the alt is running everything... once voltage drops below 13.75 volts the batterys start putting off their float charge to feed in to the system along with the alternator... if the drop continues below 13.0 then the float charge is now worn off and the batterys are playng the system off of their reserve capacity - along with the alternator still adding what its capable of...</p><p></p><p>but</p><p></p><p>in most music - its not a steady tone of bass. it has pauses and breaks in it - wich allows the alternator to re float charge the batterys back up in between bass hits - and as long as the system does not dip in the low 12s for extended amounts of time the batterys will continue to be avalable for power draw for the duration of a few songs - to a few hours of music before needing re charge depending on certan things...</p><p></p><p>again</p><p></p><p>we are talking above normal stereo system stuff here in the 4 to 6k watt systems...</p><p></p><p>i can never say enough good stuff about my singer hairpin alternator - it has a incredable rebound rate. if i play a 35hz tone for 30 seconds and drop to 13.0 volts during that tone - the rebound of the voltage is almost instant... as soon as the tone is finished the voltage will spike back up to 15.1 or 15.2 volts at a much much faster rate than my stock alternator ever could.</p></blockquote><p></p>
[QUOTE="brian84corvette, post: 8305175, member: 586635"] if 2 alts are not enough - you can make up the diffrence in ( good ) batterys. - a good battery is low esr - to give off and take back in power at a faster rate than most batterys can. the math formula of 100w to 10 amps is pretty good at rough guess on requirments mid 12 volts is still acceptable. its anything under 12 volts is where it gets scarry with things getting burnt up. the guys with big systems are not keeping above 13.5v playing full tilt unless they have an un limited budget to work with... most normal people on a budget drop in the 12s and we are fine... with my ddm2a (2500w @.5 ohm ) and my pair of mb quart discus 4 chans ( 1k each amp ) i was droping to 13s flat in my setup - and i believe thats because all 4 of my batterys will "rest" at 13.0 volts after a few days of the truck not being on - but there is a thing called float charge - where a battery will hold in the 13.75 + range as the alternator is putting 14.4 to 15.0 volts out - for a few seconds after that charge stops the batterys keep this float voltage and thats whats feeding the amps as heavy bass lines hit that drop voltage badly. my singer alt charges at 15.0 volts ( its a bad to the bone unit ) so when im blasting and the voltage starts to drop - from 15.0 down to 13.75 volts is being fully fed by the alternator.. the batterys are there - but the alt is running everything... once voltage drops below 13.75 volts the batterys start putting off their float charge to feed in to the system along with the alternator... if the drop continues below 13.0 then the float charge is now worn off and the batterys are playng the system off of their reserve capacity - along with the alternator still adding what its capable of... but in most music - its not a steady tone of bass. it has pauses and breaks in it - wich allows the alternator to re float charge the batterys back up in between bass hits - and as long as the system does not dip in the low 12s for extended amounts of time the batterys will continue to be avalable for power draw for the duration of a few songs - to a few hours of music before needing re charge depending on certan things... again we are talking above normal stereo system stuff here in the 4 to 6k watt systems... i can never say enough good stuff about my singer hairpin alternator - it has a incredable rebound rate. if i play a 35hz tone for 30 seconds and drop to 13.0 volts during that tone - the rebound of the voltage is almost instant... as soon as the tone is finished the voltage will spike back up to 15.1 or 15.2 volts at a much much faster rate than my stock alternator ever could. [/QUOTE]
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