I am building a system for a friend that is going to have an 800 watt rms (@14.4v) monoblock fro ist subs and a 4 x 60 watt rms (@14.4v) amp for the speakers. some sources say that the best way to determine the fuse value is to take the 12v rms wattage and divide it by 6. unfortunately I don't have the 12v specs handy. Can I just divide the 240 and 800 watts by 7.2 and use the resulting 33.33 and 111.11 amps as the current values? Also, to fuse the amps on individual fuses I am going to need to use ANL fuses as AGU only goes up to 80 amps (wanting to use a fused distribution block, don't see any combo blocks out there). Unfortunately I can only seem to find 100 amp and 150 amp fuses. I need to use a 40 amp fuse for the 4 channel, but ANL only goes as low as 60 amps. Any suggestions as to a course of action? (By the way I'm running a single 1/0 wire back from the battery to the distribution block and 4 and 8 guage wires to the amps)
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If quiters never win, and winners never quit, who the heck came up with the idea that you should quit while your ahead?
To determine the total amps add the RMS watts of the two amps together 240+800= 1040 and then divide by 12.8 so the total current draw will be 81.25 approximately 80 amps at max draw. So your main fuse at the battery should be 80 amps assuming that those are the only components you have running off the main cable. You can use all AGU fuses for your set up, for the distro block use a 20 amp AGU for the 4X60 and a 60 amp AGU for the 800 watt amp.
How is that possible that the current draw is that low? The 800 watt amplifier has 120 amps worth of fuses on it (four 30 ampers to be exact). Won't the fuse blow when the current draw spikes over the 800 watts on really hard hitting bass notes? Also, what do you think of Maxi fuse systems?
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If quiters never win, and winners never quit, who the heck came up with the idea that you should quit while your ahead?
Ohms law my friend
https://www.the12volt.com/ohm/ohmslaw.asp But I just came across the 12volts calculator while looking for the ohms law page
https://www.the12volt.com/ohm/page2.asp if you plug in the same numbers I used above you will get an 81.25 amp max draw. And as far as the current spiking, most of the time you will not be pulling 80 amps. That rating is at absolute max volume but of course you will never have it that loud due to distortion etc. As far as Maxi fuses I'm not a huge fan but a fuse is a fuse.