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<blockquote data-quote="helotaxi" data-source="post: 1477678" data-attributes="member: 550915">If the battery is anything other than fully charged, it is a load on the alternator.&nbsp; Period.&nbsp; A deep cycle battery is actually not as good as a starting battery for instantaneous current.&nbsp; It is slower to respond to current demands because of relatively higher ESR.&nbsp; The deep cycle can be discharged further than the cranking battery without damaging the battery, but with the car running this is irrelevant.&nbsp; After each bit of power is drawn from the battery, the alt begins to put that power back as soon as it can.&nbsp; The further discharged the battery is the more current it is going to attempt to draw from the alt and the farther in hole you are going to be.For the last time, if your alt is not capable of supplying the current demanded by the system, the only thing that you can add to fix the problem is a bigger or second alt.&nbsp; Adding batteries and/or caps to a struggling electrical system is only going to make it worse.</blockquote>

[QUOTE="helotaxi, post: 1477678, member: 550915"] If the battery is anything other than fully charged, it is a load on the alternator. Period. A deep cycle battery is actually not as good as a starting battery for instantaneous current. It is slower to respond to current demands because of relatively higher ESR. The deep cycle can be discharged further than the cranking battery without damaging the battery, but with the car running this is irrelevant. After each bit of power is drawn from the battery, the alt begins to put that power back as soon as it can. The further discharged the battery is the more current it is going to attempt to draw from the alt and the farther in hole you are going to be. For the last time, if your alt is not capable of supplying the current demanded by the system, the only thing that you can add to fix the problem is a bigger or second alt. Adding batteries and/or caps to a struggling electrical system is only going to make it worse. [/QUOTE]

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