3 30 amp fuses

My son has bought Lanzar Maxp1200 mono blk amp> I am very new to wiring car correctly would like to know what size of amp wiring kit to get to feed this amp which will be pushing a Crunch GPV12 600w RMS/1200w Peak 4+4 Series. This has 3x30 amp fuses which makes little since my cal's with Ohm's law dosen't figure. Any light to this would greatly appreciated.

TY Jim

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Installer dad

I would assume that you would need a 4 ga kit. Bring the amp to a local shop and get them to see what size wire the terminal will accept. If it will accept a 4ga wire, use it.

Where is Ohms' failing - it's not the old problem of trying to get 600W from a 12V supply into 1-Ohm speakers is it?


Fuse-wise, since 3x30 = 90A (to protect the amp), I'd suggest at least 100A capable cable and fusing - ie, 100A cable from battery+ thru 100A fuse to amp, and 10A cable from battery- to amp (else from chassis).
Nothing prevents you going bigger to reduce voltage drops except cost and practicality - eg, 150A cable, and maybe a 120A fuse, or 100A etc. (remember, that fuse is to protect the cable; and to an extent, the battery).

Note that I am designing from the max requirement POV based on the 3x30A fuses. You may prefer an 80A "battery" fuse so that blows before the 3x30A fuses...


3x30A = 90A normally equates to a max of ~900W output (ie, 14.4V x 90A = 1300W less inefficiency =~1000W etc).
But since it probably operates down to (say) 11V, that's 11x90 = 990W input => 790W output.
And since fuses should only be "normally loaded" at no more than 70% - 80% of their nominal rating, it confirms (or supports?) that the amp is of 600W RMS output.
[ That's how you check if the "1200W" rating is peak or RMS: 14.4Vx90A = 1296W which means it cannot be 1200W RMS output (unless it is 93% efficient and the fuses are run at 100% rating; and "1200W" would normally be at 13.8V anyway...). ]

Sorry about the latter block, but here are so many ways of approaching the distribution design....