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Reply With QuoteAt that guage, probably 100amp. But it's a blade fuse (inline). Glass fuses only go to 80amp.
Also you don't need to fuse elsewhere unless you want to. One near the battery is often sufficient
Hello, I will be running 4 guage power wire from my battery to a distro block that will provide power for the carnetix cnx-p1900 ver2.2 and my speaker amp which is an infinity 7541a 4 channel amp with 556rms output. The amp has 2 30amp fuses on it.
Am i to assume the power draw is then 60amps total from the infinity amp
and 28amps from the p1900 power supply?
I am trying to figure out how much the inline power fuse near the batter should be to protect my equipment.
Should i include inline fuses anywhere else on my power lines?
Thanks.
At that guage, probably 100amp. But it's a blade fuse (inline). Glass fuses only go to 80amp.
Also you don't need to fuse elsewhere unless you want to. One near the battery is often sufficient
the inline fuse im looking at is this one:
http://cgi.ebay.com/4-8-GA-Inline-AG...QQcmdZViewItem
comes with an 80amp fuse
So you recommend using a 100amp fuse, that is to say you think the p1900 and the speaker infinity amp will draw about 100amps of power? Is that a precise calculation?
What i am not sure about is if there are 2 30amp fuses in the infinity does that mean it draws 60amps?
And my math for the p1900 max draw is: 140watt psu translates to 28amps of power draw. Is this correct?
If so this means the total power draw from the battery will be somewhere near 88amps, so if i used a 100amp fuse would the 12amp overcompensation damage my system after the draw went over 88?
The size of the fuse does not necessarily indicate the power draw of the device.
Typically a fuse is rated slightly higher than the maximum power draw of the device.
This is so that a short circuit in wiring (which sends amassive amount of current to the device) will blow the fuse, rather than damage the equipment.
Your calculation for the Carnetix is incorrect.
Amps = Watts / Volts.
140W / 12V = 11.66A For your Carnetix, a 15A fuse would be sufficient.
If you have two amps with 30A fuses and a 15A fuse on the Carnetix, that totals 75A.
You would want a 75A or 80A fuse.
The "12A of overcompensation" is not correct.
If the power flowing along that line is more current than the rating of the fuse, the fuse blows, breaking the circuit and saving the main power line. If too much current goes into a power line, it will heat up, possibly causing a fire.
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