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Message: <blockquote data-quote="grassroots" data-source="post: 5733962" data-attributes="member: 571725">specific resistance of copper is 10.4. aluminum is 17.x (i can't remember exactly).that's a pretty big difference...aluminum is lighter than copper, but to get the same ampacity rating you need to upscale the wire size (like stated) so it kinda balances out.you also gotta worry about aluminum wire pulling out of your amp or battery connectors since it swells and retracts with heat/cold (like mentioned).and you should use nolox on terminations to keep aluminum from oxidizing.copper is always a better conductor than aluminum.edit: and depending on the insulation of the wire (which is a huge factor in how much amperage it can safely conduct) you have to use 3/0 aluminum to have the same rating as 1/0 copper wire.</blockquote>

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