What size fuse should I use on distribution block going to Opus power supply?

smoldyr · 01-07-2004, 06:27 PM

I have 4 AWG wire running to a dristribution block in my trunk. That splits into two amps and my carputer. What size fuse should I put on the line running to the Opus in my carputer? In other words, how many amps does the Opus draw?

shakes · 01-07-2004, 07:05 PM

take the wattage of your opus ... divide by 12, and that's the max current it will draw. add a few amps to that and there's your fuse size.

Walleye · 01-07-2004, 07:08 PM

Quote: Originally Posted by shakes

take the wattage of your opus ... divide by 12, and that's the max current it will draw. add a few amps to that and there's your fuse size.

isnt the max wattage of the psu the max sustained wattage? you might want to add more than just a few amps, for burst power.

edit:

also, the psu only claims it's 90% efficient. that's cause it has to go dc-ac-dc. (transformers only work on ac power). so you have to have at the least 110(about) percent of it's wattage before dividing by 12 (if you want to follow his example). but i still think the wattage applies to sustained flow ("rms", if we were talking about amps.) so allow some burst power. yeah, that's what i was saying. you need to allow for burst power.

smoldyr · 01-07-2004, 07:23 PM

I found a 20 amp fuse, that good enough? It's a 150 watt Opus by the way.

shakes · 01-07-2004, 08:05 PM

that should be fine

Walleye · 01-08-2004, 12:38 AM

to my knowledge it's a 20 amp fuse that goes to the radio anyway.