4 Deep Cycle in Parallel, Charing off of Alt?

[draydel]

I originally posted this in the wrong section, but just reposted it here in the right section. Not sure how to delete other..

 

Anyways.

Not sure where to even start.

I've been working on a build for some time now but I want to get it finished and done correct. What better way to hop on here. 

I've been a fan of Steve's for a while and a lot of you guys are super knowledgeable and so I'll just ask a few things.

 

I have already replaced the big 3.

I have a high output alternation from Ohio Gen 300A with 0/1 wire going to the starter battery (optima red top D35 - going to change to a blue top d34 to match rest of setup)

Then two 0/1 wires going back to dist block to power 3 amps (2 rockville db55's and a skar RP2000.1D) (soon to be 5 amps, still researching on which ones, if im going to keep the current 3 and add 2 more, or replace all of them)

 

I have four Optima Blue Top D34, ran in parallel, to power a bunch of AC audio equipment (turntables, mixer, etc) using a big inverter - This bank is it's own power system and I charge it every so often with a trickle charger using an extension cord out of the house. After a few hours of music, the power isn't enough and things begin to power off. I don't want to do it this way any more. It's been working great for a long while, but I could always use some help here.

 

My question is:

 

I would like to charge the 4 blue top's in the back with the alternator but don't want alt whine.

The last time I tried to do this, was YEARS ago, before I grounded out the car and replaced the big 3, before ground loop isolators, and it had a huge alt whine.

Now I'm revisiting the idea, but with some concern on the best way to go about this.

 

When the car is performing, it will always be running to charge the batteries and power the system.

 

Your thoughts on a: 

 

DC to DC charger?

Battery isolator/Split charging system?

 

If any ideas, or guidance and best approach, please let me know.

 

If the 4 battery bank in the back can be on the same car electrical system, how can we make sure there is no whine?

I've grounded the shit out of everything I can think of..

The dist block in the back isn't going back up to the car battery - it's grounding to the metal in the trunk.

 

I'm basically rewiring the entire thing so all advice is welcomed..

I know each piece of the system could be upgraded to a better piece, but let's focus on this question first, then the upgrades lol

[Dafaseles]

If everything is grounded correctly and effectively, you shouldn't get any ground loop noise. I'm assuming that's what you mean by alternator whine. 

[draydel]

Should I be grounding everything to the same exact spot on the frame? Or back to the starter battery?

 

And so I could charge the 4 batteries in the back on the alternator?

Would I run lines direct from the alternator? if so how many? 2 runs for 4 batteries? 4 runs for 4 batteries?

And would you happen to know of a smart battery isolator/relay? Basically how to do this the most effective way and smartest way lol

[Dafaseles]

As far as the grounding of everything, me personally, would use different spots on the frame. Maybe 3-4" apart. I would also double or even triple up on the runs of the big 4 upgrade. 

You can run the starting battery and the battery bank separate off the alternator if you'd like, me personally, I'd just run all the batteries in parallel and make it like one big battery. 2 1/0 runs to the under the hood battery to the alternator, then 3 1/0 runs between the batteries(unless you've got a buss bar connecting the battery bank, then just 3 runs from the front battery to the rear) then just ground the crap out of that battery bank to the frame. Send a couple runs from the back bank up the the ground on the alternator casing. You can't overdo your grounding. It's just as important as your power. 

As far as a battery isolator, you could find a good one I'm sure. I have no idea. But if you're running your equipment with the engine running, there's really no need. 

I would also recommend getting a real time volt meter. Then you'll know if the batteries and alternator you have will be sufficient for what you're trying to do. If you see your voltage dropping too much, I would look into running 2 alts. If that's not enough, better batteries with more amp hours on them. The more amp hours the better