1. ## Opus 150w

Morning, I've been reading round the forum but am struggling to find the correct awnswer.

My opus arrived this morning and I have it on my desk and I am just trying to vision the wiring. I understand the PC side no worries. The problem I have is In the instructions for then opus, it says wire it straight to the battery on the +12v side. I understand the -12v can be wired to the chassis and the yellow wire goes to the signal on the stereo. What I need to know is should I put a inline fuse on the +12v and if so, how big?

Am I right in saying that the higher the wire rating the less current it can take? So that'll be 12 gauge for the battery and 18 gauge for the stereo signal?

I have everything ready for install now so I can't wait to get it wired up.

Thanks,

Paul.

2. I think most people actualy wire direct to the battery with both wires and use at least 8 gauge (ie don't use 10 or above).
the fuse you need is going to be about 15A and should be as close to the battery on the +12V line.

There is a thread here with some info:

Power wires inquiry
Opus Fuses

Edit: to do a simple fuse calc: power/voltage=current so 150/12=12.5A. If you find you ar eblowing fuses when everything is running (the opus can produce over 150W i believe and there are also bad connections etc that use current) then you may want to replace it with a 20A or something in between if you can get it.

3. Diagram that comes from Opus: http://www.opussolutions.com/images/...pplication.jpg

You also might want to add a small fuse on the ign line into the Opus 1A should be sufficient as i am pretty sure it won't be drawing more than 10W on that line!!!!!!

4. Thanks very much Mr Monkey.

Reading the second thread you gave as an example got it accross ok. So if i'm right I use 8 gauge wire, and a 15A fuse as near to the battery as possible. Ground to the chassis/or battery and a 1A fuse from the back of the stereo.

??

Hope thats right,

Paul.

5. Yup, sounds about right. I would probably try going direct to the battery -ve initially as 150W is a lot to be feeding back through an earth point. The only reason i would connect to an earth is if i was getting some ground issues with the sound.

You may want to get the system up and running with a 15A fuse and see if it will do. The lower the fuse the safer.

The 1A off your stereo sounds good. I would recommend this as you may as well be safe than sorry.

6. my 2 amps and opus are connected to the chassis, works fine for me

7. Originally Posted by Nic
my 2 amps and opus are connected to the chassis, works fine for me
Yeah they should be ok but i have a french car with french electrics so I am running a -ve wire so i know exactly where that current is going!

8. Right, I've been shopping this morning and I am struggling to find the wire required (8 gague). The only shop that has helped me remotley is a little caravan/car supplies shop. He seemed to know his electrics but I'm not convinced what I have bought is right.

I have an inline 15amp fuse and some wire he assures me is capable of taking 250volts at 17.5amps. It is 2 core but the wire inside only looks quite thin. I was expecting great big fat red wire! He assures me this will be fine for 12v 15amp 150w.

Thanks,

Paul.

PS I'm waiting for a reply as today is fitting day and if this is right I have everything ready to fit !!!

9. LinITX sells 8 gauge wiring kits.

Oh you need it today...then try a car stereo install place or maplins. 8 guage should be at least 3.7mm i think in diamter. have alook on google for gauge. look here and see if your wire matches up: http://ohm.bu.edu/edf_info/info/wire-resistance.html

General rule 8 gauge = 8mm squared cross section.

10. Sorry I'm not sure if I understand, is the cable I have not good enough. The overall cable is quite thick but it's 2 core both wires inside are about 3-4mm each?

Paul

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