Fuse Rating And Placement

[MOHpro]

I have two NVX JAD 1200.1 amplifiers and one NVX JAD 800.4 amplifier. The 1200.1s each have three 40 amp fuses for a total of 120 amps each.so the combined total fuse rating for the two 1200.1s is 240amps. The 800.1 has three 25 amp fuses for a total of 75 amps.The total combined fuse rating between all 3 amplifiers is 315amps. I will have one run of 1/0 from the primary battery to the secondary battery in the trunk. The power wires from all three amplifiers will be connected to the secondary battery. Given this info, is the following correct for fuse ratings and placement:

Power wire from primary battery to secondary battery: 300A

Power wires from the two 1200.1s to the secondary battery: 120/125A for each wire.

Power wire from the 800.4 amp to the secondary battery: 75/80A

Power wire from the alternator (mechman 270A) to the primary battery: 300A

[MotorCityFats13]

only input I can offer is you dont need to fuse the power wire from alt to battery unless you plan on fusing both ends....it would be like fusing both ends of a cable going to a second bank.... the easy way is to find out what the cable calls for with the distance of the run and fuse lower than that because fuses blow at 20% over the rating..... if the 1/0 catches fire at 300amps and you fuse for 300amps then the fuse blows at 360 and your car is already on fire.... for the most part the amp has fuses to protect the amp the wire has fuses to protect your car.... the wire is not fused mainly to protect the amps unless the amps you choose have no external fusing

from your post it sounds like you are under fusing where it matters and over fusing where most people do not use a fuse

just remember any wire that has power on both ends needs 2 fuses and anytime wire gauge changes you need a fuse