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<blockquote data-quote="profundus-sanus" data-source="post: 2925130" data-attributes="member: 572787">the capacitors inherent resistance value, which coincidentally is greater than that of a wire, would make it the path of most resistance. So caps only charge when the amp isn&#039;t drawing current and only discharge when more current is being drawn than the power wire can supply. Realistically you can use a slightly smaller wire in conjunction with a cap.Caps have a use when the required current is smaller than the alternators output capacity. If your constantly dropping to battery voltage then a cap is wasted space and money....You need to get an alternator.I know from experience that caps do work. I ran a pa 4 farad cap and 4 guage to a opti2000d on a a stock 140amp alternator and the cap eliminated a .5 volt drop. Thats with the big three done in hyperflex 1/0. If i&#039;m getting 0-.1 voltage drop on around 1900 watts something must be working.To the op, whats your amp and other electrical setup? If its a real 4000 watt amp your going to need some serious alternator output.</blockquote>

[QUOTE="profundus-sanus, post: 2925130, member: 572787"] the capacitors inherent resistance value, which coincidentally is greater than that of a wire, would make it the path of most resistance. So caps only charge when the amp isn't drawing current and only discharge when more current is being drawn than the power wire can supply. Realistically you can use a slightly smaller wire in conjunction with a cap. Caps have a use when the required current is smaller than the alternators output capacity. If your constantly dropping to battery voltage then a cap is wasted space and money....You need to get an alternator. I know from experience that caps do work. I ran a pa 4 farad cap and 4 guage to a opti2000d on a a stock 140amp alternator and the cap eliminated a .5 volt drop. Thats with the big three done in hyperflex 1/0. If i'm getting 0-.1 voltage drop on around 1900 watts something must be working. To the op, whats your amp and other electrical setup? If its a real 4000 watt amp your going to need some serious alternator output. [/QUOTE]

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