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<blockquote data-quote="anger" data-source="post: 8308745" data-attributes="member: 643714">I&#039;ve read a ton of threads on the topic of batteries, alts and wire gauge but haven&#039;t found any definitive answers. If there is one that relates to my situation specifically, feel free to point me in that direction.I currently have an optima yellow top under the hood, stock 130 amp alt, NO big 3 and 4 gauge to a dist. block...and from there, 4 gauge to my RF t1000BDcp (~1000w rms @ 1 ohm) and 4 gauge to an unknown 4 ch (~50w rms x 4 @ 4ohm). Voltage dips to low 12s.I have just under $1,500 saved up for this upgrade and want to spend wisely. Hopefully that&#039;s enough. I am pretty set on the SQ 2200D which would leave me with about a grand for electrical. This is where I get lost...I think the big 3 is obvious, but how do I determine batteries needed? I&#039;ve seen calculations based on Ah and then manufacture&#039;s recommendations contradict these formulas.Do I need to consider replacing the optima up front when adding a different make in the rear?And lastly (for now), how do I determine if/when I need a higher output alternator?TIA</blockquote>

[QUOTE="anger, post: 8308745, member: 643714"] I've read a ton of threads on the topic of batteries, alts and wire gauge but haven't found any definitive answers. If there is one that relates to my situation specifically, feel free to point me in that direction. I currently have an optima yellow top under the hood, stock 130 amp alt, NO big 3 and 4 gauge to a dist. block...and from there, 4 gauge to my RF t1000BDcp (~1000w rms @ 1 ohm) and 4 gauge to an unknown 4 ch (~50w rms x 4 @ 4ohm). Voltage dips to low 12s. I have just under $1,500 saved up for this upgrade and want to spend wisely. Hopefully that's enough. I am pretty set on the SQ 2200D which would leave me with about a grand for electrical. This is where I get lost... I think the big 3 is obvious, but how do I determine batteries needed? I've seen calculations based on Ah and then manufacture's recommendations contradict these formulas. Do I need to consider replacing the optima up front when adding a different make in the rear? And lastly (for now), how do I determine if/when I need a higher output alternator? TIA [/QUOTE]

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