Eletrical help

[Nismojunky]

i need some help

im going to be running dual battery's i also want to run dual altys, what i want to do it have both altys charge the main battery and transfer power to the rear battery i want the rear battery isolated how can i do this most idolaters ive found or looked at said not to use the rear battery as a power source just as a backup for starting , i want to run my subs inverter and oba off the rear battery how can i do this?

[Nismojunky]

Uploaded with ImageShack.us

this is what i want

[petespath]

Wish I could be of some help, but I can only suggest google a "dual battery" or "dual alternator" setup.

Good luck

[Nismojunky]

think i found what im looking for

http://www.colehersee.com/pdf/hot_feed/ ... eryIso.pdf" onclick="window.open(this.href);return false;

[Snafu]

I gotta ask...why dual alternators? I have read many dual batteries set ups but never a dual alternator.

[Nismojunky]

the sound system thats going to be installed (if i ever get a weekend with out rain) will be drawing 120A or so plus with everything else i want to run i dont want to run short on power plus after loosing one alty on the trail and almost loosing another one few weeks after that im going to run 2 just to be safe

[Adam]

Another reason is because the second alternator will be in place of or just below the AC compressor it will not get submerged in water. This is on a wd21 were the AC is at the top right.

Robb do you want help with your stereo?

[Nismojunky]

Found one here I'm good

[Nd4SpdSe]

Indeed you're power requirements aren't bad for one alternator. I've got a 165A which would be plenty in your case, but I totally understand why you'd want a spare. I don't see it being a problem, many people have, but I researching this now for you, some people say there may be problems with power regulation, others don't, but those that don't seem to be legit in their claims. One mention, which is a great idea to consider, would be to add in a "fail-safe diode" so that the one alternator doesn't get damaged or excessively works if the other alternator dies or the regulator malfunctions, but it could affect charging since diodes eat up 0.7v. Here's a good read on running multiple alternators:
http://listerengine.com/smf/index.php?P ... pic=4957.0" onclick="window.open(this.href);return false;

There's even things like regulators for multiple alternators:
http://www.amplepower.com/products/sarv3/index.html" onclick="window.open(this.href);return false;

In the end, it seems like alot of theory is being thrown around but little concrete evidence on it. Ironicly, it's something that's been done in car audio systems for a while, even some heavy-duty pickup trucks use multiple alternators from the factory. Personally, I don't see any problems running 2 alternators directly , especially if they're identical, I asked my one car audio buddy, he's worked with them and hasn't experienced or seen any problems with that setup.

This is how I would wire it.

[Nismojunky]

I'm going to have amp meters on each so I can tell what there charging at I ordered that smart battery isolater it was 116 bucks