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<blockquote data-quote="DidUHearThat?" data-source="post: 4689597" data-attributes="member: 594758">Just because the fuse says 120 doesn&#039;t mean it limits the system to 120 amps.&nbsp; Fuses can exceeds twice their rated current for 20-30 seconds.&nbsp;&nbsp; They don&#039;t trip from short peaks of thier rated current.So a 200 amp fuse could pass 300-400 amps for several seconds.&nbsp; There is no reason for a fuse that size on his system.&nbsp; He could use zero gauge wire if he want&#039;s to.&nbsp; The wire is good for 325 amps, but a fuse that big would provide almost no protection for him in a 70-120 amp electrical system.When picking fuses your trying to stay within a target of safety and reliablity.&nbsp; You want it large enough that your not poping it with the occasional bass note, but small enough to protect your wire and electrical system at the first serious problem.In the case of the OP, I would go with a fuse rated at what his future HO would be, as long as it is less than what the wire is rated at, probably 120-160 amps.</blockquote>

[QUOTE="DidUHearThat?, post: 4689597, member: 594758"] Just because the fuse says 120 doesn't mean it limits the system to 120 amps. Fuses can exceeds twice their rated current for 20-30 seconds. They don't trip from short peaks of thier rated current. So a 200 amp fuse could pass 300-400 amps for several seconds. There is no reason for a fuse that size on his system. He could use zero gauge wire if he want's to. The wire is good for 325 amps, but a fuse that big would provide almost no protection for him in a 70-120 amp electrical system. When picking fuses your trying to stay within a target of safety and reliablity. You want it large enough that your not poping it with the occasional bass note, but small enough to protect your wire and electrical system at the first serious problem. In the case of the OP, I would go with a fuse rated at what his future HO would be, as long as it is less than what the wire is rated at, probably 120-160 amps. [/QUOTE]

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