Help with fuse

[iAlex684]

I need help with deciding what fuse to get for my fuse holder near the battery. The amp I'm getting is a Hifonics ZRX1816.1. My amp wire is 4 Gauge and subwoofer is wired to 1 OHM I currently have a 100A fuse in my fuse holder when I purchased a wiring kit. The amp has two 70A fuse on it so does that mean I need a 150A fuse for my fuse holder? Or will the 100A in my fuse holder work?

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[pickup1 5,000+ posts]

Try the 100...get a 150 as back up...I ran over 2000 watts one time on a 100 amp breaker.

 

[n2audio 5,000+ posts]

It's more about the wire than the amp. 150A is pushing the limit, if not over the limit for a lot of 4 awg.

No point in upgrading unless the fuse blows.

And if the fuse does blow you probably need to upgrade the wire along with the fuse.

FWIW - I've been running ~1500w class D on a 100A fuse for several years now.