amp fuse help

[Javwohl]

Hey everyone, I'm getting ready to install my new system in next couple of weeks and need to get the last bit of stuff bought and need your help with getting the right fuse for the system.
I'll be installing a Polk audio pa d1000.1 for the 2 Polk audio 12" dvc subs and a Polk audio pa d4000.4 for my Polk audio 6.5" component sets.
I can't find peak power for either amp just rms rating.
i will be running 0-gauge wire from battery to main system fuse then same wire to a fused distribution block then 4-gauge wire to each amp.
I need to know what size fuses i need for the main and in the distribution block.
the pa d1000.1 shows 1200x1@1ohm,800x1@2ohm,500x1@4ohms. The amp itself has 3 40a fuses on it.
Not for sure if i need a 120a fuse for in distribution block or if my math was right 150a
The pa d4000.4 shows 200x4@2ohm, 125x4@4 ohm and 400X2 bridged @4 ohms. The amp has a 40a and a 35a fuse. So do i need a 75a fuse or my crazy math comes out to a 93a which probably go 100a at that point.

Then main fuse needs to be either 200a or 250a.

Thanks for all your help.

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[GATORB8]

Really you fuse the wire not the amp. Here’s the blue sea chart.

You’ll want at least a step up from the amp fusing added up for each branch if your wire gauge allows.

 

[lashlee]

I typically will use a 300a fuse under the hood for 1/0, and use smaller fuses at the distribution block for each amp. Most amps will work fine with a 60a fuse in the distribution block. Remember, the fuse protects the wire, not the component.

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