DiyMobileAudio.com Car Stereo Forum banner

1 - 6 of 6 Posts

·
Registered
2014 Kia Sorento EX
Joined
·
157 Posts
Discussion Starter #1
Firstly, I know I = P/V

Secondly, I'm just a bit confused on how to properly calculate the fuse size at the battery for my Kenwood X801-5 amplifier.

It's specified RMS watts per channel @ 4 ohms is 50 W x 4 + 300 W (sub) = 500 W

Also in the specs it indicates the Operating Voltage of 14.4 V and Current Consumption of 58 Amps.

The amplifier has 3 x 30 amp fuses installed in it.

I'll be powering it via 4 AWG wire over about a 6' run from battery post to amp terminal.
 

·
Registered
Joined
·
8,982 Posts
I’d pop a 40 amp fuse in and be done. Theoretically, your amp could pull 60 amps while still operating within its limits, but I doubt you’ll ever pull max amperage. A 40 or 60 amp fuse will be fine.
 

·
Registered
2014 Kia Sorento EX
Joined
·
157 Posts
Discussion Starter #3
thanks! I saw a dyno by Williston, they got this amp to pull 88.3 amps putting out 511 watts on the sub channel and 221 on the front channels with 76% efficiency.

But yea, I'm not going to be listening to sine waves at 100 volume :)
 

·
Registered
Joined
·
8,982 Posts
Under fusing is perfectly safe. If a 40 amp fuse blows, go to 60 amps. The wire can handle more, but there’s no reason to run a 100 amp fuse if the amp won’t pull that much when working correctly.
 
1 - 6 of 6 Posts
Top