TeamRSX

I currently have my carputer up and running, but i am debatiing my power cable size and fuse sizes for my main power next to the battery.

I have done some reading and testing and just want to make sure everything is correct.

Here is the wattage for my system which is just a ballpark:

ATX Motherboard - 25W
Keyboard + Mouse - includedW
CPU Fan - includedW
AMD Athlon 64 3400+ - 68W
sata Hard Drive - 25W
1.5GB DDR RAM (3 Sticks) - 30W
External DVD Rom (slim usb)- 5W
Lilliput Monitor - <10W
GPS Receiver - 5W
7-Port Powered Hub - 17.5w
AMP = 300w

watts = 485.5w
amps=watts/volts= 485.5/13.6=35.6 AMPS

So, right now i have my main power wire from the battery as 8awg and using a 60a fuse. The power wire then runs into my fused pwr distro block which i have 20a fuse for my dsatx and 50a fuse for my amp(on my amp is has 2 25a fuses, so just added them up and put 50a in the distro block, same thing with my dsatx, its has a 20a on the hardware) then both those power wires run to the device again using 8awg wire.

Since the max currect for 8awg wire is 50a, the power wire running for my dsatx and amp should be fine. since they are under the max current.

My question is my main power by my battery. I am currently running a 60a fuse on 8awg wire. Now the fuse is not blowing becasue i am not exceeding the amperage on that power line since from my calculation above the computer is only drawing 35.6amp roughly.

I was originally going to goto 4awg wire and put a 80a fuse by my battery becasue i though the fuse by the battery had to be the same current as all my devices. Since i have a 20a and 50a fuse in my distro block i though i had to add them up and us at least that. So i was going to put in a 80a fuse by my battery and use 4awg wire.

I dont think i need to do that as the fuse is rated according to the size wire.

Since i calculated the amperage for my system at roughly 37amps i was thinking just to keep my 8awg main power wire and put in a 50a fuse by my battery since i will never hit 60amps i think

As i think it would be more safe this way then jsut putting a large fuse that will never blow.

Am i on the right track? Just want to make sure i have my power wires and fuses correct.