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Electrical System Upgrades 101
Ok there has been a lot popping up about dual batteries, stiffing caps, etc lately. So I thought I would pull together some links & some commentary in one place for people to find the answers in one place.
First lets get the theory down right: Middle of the thread one of my mini-novels:
http://www.nhtoc.com/vbforum/showthr...ght=alternator
Next up:
Dual batteries:
Pics:
http://www.nhtoc.com/vbforum/showthr...threadid=12894
Discussion of Dua;l Batteries & why/why not:
http://www.nhtoc.com/vbforum/showthr...ght=alternator
How To & where to buy in one link:
http://www.nhtoc.com/vbforum/showthr...threadid=12893
Solenoid thread:
http://www.nhtoc.com/vbforum/showthr...dual+batteries
Big System 101:
http://www.nhtoc.com/vbforum/showthr...ght=alternator
troubleshooting 101:
http://www.nhtoc.com/vbforum/showthr...ght=alternator
Next a little commentary
Rob W.
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The commentary is all really held in the very first link about Aluma Pro Caps...
The industry as a whole has gotten on what I call an "Audio Jewlery Kick" in the last 10 years. Gold plated this, PLatinum plated that, stiffening caps give you more bass, such-n-such barnd X wire is less resistive than brand y, our speaker cables are better etc. From a retail perspective its all about the add-on sale. Get the $$ for the high margin parts so you can give a percieved discount on the big items.
So here is the skinny:
1.) If your headlights are dimming @ the stop light ALTERNATOR not batteries or Caps. PERIOD.
2.) If your lights are dimming on the highway.. turn it down.. LOL & then 2nd alternator, batteries & a 50+ Farads of cap.
3.) Stiffening caps: simple statement: Multiples are BAD, they add up their relative resistence in your power chain. Go BIG or don't go. 15 farads minimum, otherwise don't bother. Coke-Can sized caps are gimmiks.
4.) Dual batteries are only logical if you want playing time with the vehicle off. Otherwise they are just another source the alternator has to charge for.
5.) Power wire, fuses & such: Whatever the manufacturer of your amp(s) recommends go up one size. If you have multiple amps, ad up the fuses ON THE BODY OF THE AMP, then go to the link below & find the wire size that matches the amp ratings & the length of wire.
http://www.the12volt.com/wiring/recwirsz.asp
6.) The Circuit Breaker or Fuse @ the battery is NOT to protect equipment, it is ther to protect the vehicle. 18" or less from the battery. I won't use fuses. They can fail. A manual reset circuit breaker is easier, safer, & more functional, need to work on the system, flip the breaker.. not dig out the right sized allen wrench.. undo the battery connection, fight the fuse holder apart etc. Most importantly is access time. The IASCA competition rules have stated for years that the main fuse must be able to be disabled to save the vehicle from a dead short in under 30 seconds. Aint happening with a fuse holder. Circuit breaker.. flip the lever. Done.
7.) Wire runs should not be UNDER the vehicle. inside the vehicle or inside the frame rail minimum. If it has to go under the vehicle then metal conduit is required & I would put a circuit breaker at BOTH ends of that length of wire. Also, rubber gromets where ever it passes through metal. DUH...
8.) Ground wires should always be AT LEAST the same size for the power wire going into the unit being powered. 4ga in = 4ga out. When dual battery systems, larger alternators, big systems etc. the grounds & power feeds need upgraded to handle the new amperage. See the chart above.. it covers electricity, not just musical component wiring.
As usual, ask questions in the general audio forum not on the sticky.
Rob W.
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A couple new links I recently found.
N ow i need to find out how to post them without the damn smiley icons messing up the urls
Stay tuned.
Rob W.
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Registered User
Name:
Just click the "disable smilies in this post" box
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Bobby Bouchet's neighbor
Name:
maybe time to pull this sticky. All links got
Not Found
The requested URL /forum/showthread.php was not found on this server.
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must be your server or the network a the tiime.. links work fine right now...
2:03pm CST 2/14/06
I check the stickies every month...
if you find dead links or stickies in this forum please PM me directly.
Rob W
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