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<blockquote data-quote="Roland" data-source="post: 8335283" data-attributes="member: 647142">Most folks you ask say &quot;fuse to wire size&quot;, but that&#039;s info is flat out wrong in some cases! Max fuse size is just that, it&#039;s the largest fuse you should use with a given wire, to protect the wire.By that logic if you used 4/o ga wire, your fuse could be larger than the batteries ability to even blow the fuse, and that could result in a damaged Battery and worse.&nbsp; There is Zero benefit in using a fuse twice the rated power of the end use equipment.&nbsp; Fuses are for safety to protect your entire electrical system not just the wire (when using oversize wires). The larger the fuse the lower the over all protection.A 200 Amp fuse is more than enough. I run 3 PPI amps in one of may vans and it has a 120 amp fuse feeding the Distribution block.&nbsp; When i test&nbsp; it by trying to blow the fuse using max music volume, it will only blow a 60 amp fuse.I would love to hear someone make case for using&nbsp; a 300 amp fuse were a 150 amp fuse would work.</blockquote>

[QUOTE="Roland, post: 8335283, member: 647142"] Most folks you ask say "fuse to wire size", but that's info is flat out wrong in some cases! Max fuse size is just that, it's the largest fuse you should use with a given wire, to protect the wire. By that logic if you used 4/o ga wire, your fuse could be larger than the batteries ability to even blow the fuse, and that could result in a damaged Battery and worse. There is Zero benefit in using a fuse twice the rated power of the end use equipment. Fuses are for safety to protect your entire electrical system not just the wire (when using oversize wires). The larger the fuse the lower the over all protection. A 200 Amp fuse is more than enough. I run 3 PPI amps in one of may vans and it has a 120 amp fuse feeding the Distribution block. When i test it by trying to blow the fuse using max music volume, it will only blow a 60 amp fuse. I would love to hear someone make case for using a 300 amp fuse were a 150 amp fuse would work. [/QUOTE]

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