help with fuse size in holder near battery and distribution block

[mr roo]

All, I am helping my son with an install. We will use several pieces of equipment that are in my left over from things I previously ran.

For amps, he will run two Polk Audio PA D2000.02. Each amp is rated for 125 x 2 at 4ohm and 400 x1 4 ohm bridged. Each amp has dual 25 amps internal fuses. I will run 1/0 from the battery to a Streetwires CBR 44a agu combo fuse and ground block. Each amp will receive 4 AWG from the fuse blocks. All wire is OFC. I know the wire is possibly overkill, but we already had it on hand to use.

My question is what fuse would I run at the fuse holder near the battery and then which fuses would I run in the distribution block for both amps? I was told that 250 in the fuse holder at batter and 50 in distribution block for each amp would cover, just want to make sure if that is true?

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[Deon1818]

All, I am helping my son with an install. We will use several pieces of equipment that are in my left over from things I previously ran.

For amps, he will run two Polk Audio PA D2000.02. Each amp is rated for 125 x 2 at 4ohm and 400 x1 4 ohm bridged. Each amp has dual 25 amps internal fuses. I will run 1/0 from the battery to a Streetwires CBR 44a agu combo fuse and ground block. Each amp will receive 4 AWG from the fuse blocks. All wire is OFC. I know the wire is possibly overkill, but we already had it on hand to use.

My question is what fuse would I run at the fuse holder near the battery and then which fuses would I run in the distribution block for both amps? I was told that 250 in the fuse holder at batter and 50 in distribution block for each amp would cover, just want to make sure if that is true?

250 at the battery might be overkill. Itll work but 125 would be less smoke if something does short out.
50s at the dis block sounds good

 

[ThxOne Premium Member]

Yeah, 125 - 150a would be plenty at the battery. I would use a circuit breaker at the battery instead. It allows you to cut power to the whole system to work on it or whatever.

Like this:

150 AMP Circuit Breaker

$79.00 Ultimate Circuit Protection Accepts 0GA or 4GA wire terminal free Easy reset / disconnect Includes terminal cover Technical Information

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