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<blockquote data-quote="vasyachkin" data-source="post: 56980" data-attributes="member: 544250">&quot;the drop that causes the lights to dim occurs above the voltage of the batteries&quot;i am not sure what you&#039;re trying to say here, there are only 2 sources of voltage - battery and alternator.&nbsp; to say that voltage is about that of batteries would imply that the alternator is currently charging the batteries - but if alternator is able to charge the batteries even during a bass peak, then why do we even need a battery in the first place ? if even during peak demand the alternator is being able to both meet and exceed it and have extra to charge the battery -- certainly this is not happening.&nbsp; certainly during a bass peak a battery is beind discharged and the voltage is precisely that of the battery, (or less if power wire is not thick enough).battery and power wire are in series and both will drop the voltage at high current demands, you have to minimise both, look up the specs on a typical battery&#039;s internal resistance, then look up tables that show resistance of wire based on length and gauge of it, and decide which is the bottleneck.i dont think a second battery would somehow strain the alternator when it is being charged, after all it will never take more current than alternator will give it.on the other hand if you abuse your new higher power of system, then you will run the batteries down because alternator will not be able to recharge them as fast as you will be able to discharge them.</blockquote>

[QUOTE="vasyachkin, post: 56980, member: 544250"] "the drop that causes the lights to dim occurs above the voltage of the batteries" i am not sure what you're trying to say here, there are only 2 sources of voltage - battery and alternator. to say that voltage is about that of batteries would imply that the alternator is currently charging the batteries - but if alternator is able to charge the batteries even during a bass peak, then why do we even need a battery in the first place ? if even during peak demand the alternator is being able to both meet and exceed it and have extra to charge the battery -- certainly this is not happening. certainly during a bass peak a battery is beind discharged and the voltage is precisely that of the battery, (or less if power wire is not thick enough). battery and power wire are in series and both will drop the voltage at high current demands, you have to minimise both, look up the specs on a typical battery's internal resistance, then look up tables that show resistance of wire based on length and gauge of it, and decide which is the bottleneck. i dont think a second battery would somehow strain the alternator when it is being charged, after all it will never take more current than alternator will give it. on the other hand if you abuse your new higher power of system, then you will run the batteries down because alternator will not be able to recharge them as fast as you will be able to discharge them. [/QUOTE]

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