but the battery is rated at a certain APH and will only allow the rated current to be drawn for a designated amount of time.
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the altenator will be rated to o/p enough current to supply the battery.
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the cabling will be rated to the maximum permissable o/p of the altenator.
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when you are drawing peak power this is supplied from the battery NOT the altenator.
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the amount of volt drop along that run is negligable, the volt drop that you need to keep to a minimum is from the battery to the amp etc.
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how much current is your ice going to draw? if your going to the point where you need to start up grading cable csa then you should start to look at the entire supply system.
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if your going to the stage of upping the alt wires due to volt drop over that short run then you are you taking into account the derating factors of bunching, ambient temp, retaining methods, passing through insulation, etc.
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as this wil all effect volt drop
![Wink :wink:](./images/smilies/icon_wink.gif)