Battery Isolators? Possible to run 2 in parallel?

[Undisputed King 10+ year member]

Ok so I am led to using a battery Isolator because I am going to be running a 800A Marine Battery for my system and while still running my stock battery for my stock options. So in order to prevent my aux battery from eating up my stock battery I need something to separate them. Which leads me to my next question.

So considering at full power my system should draw about 320A-330A. I will be running a single 250A alternator. Since there are no battery isolators affordable that can handle that kind of amperage I was thinking of running 2 200A isolators, have the alternator output run to both isolators, and 2 leads combined (one from each isolator) to each battery, that way since each isolator has a resistance, considered they are wired in parallel like that should cut the resistance in half and reduce the voltage drop across the diodes?

Do I really need an isolator to handle my system at full power? Or do I just need an isolator to support the full 250A charging capacity from the alternator?

Just if your curious I have 2 Orion HCCA-D2400's to be strapped and wired to a 15" AQ HDC315 at 4 ohms. And 2 Orion HP-2400's (85wRMS X 2 CH @ 4 ohms) to run my rear fill and the other for my Kicker KS components up front. All this to be installed next week some time. And soon I will get an Orion HP-4800 (200wRMS X 2 CH bridged @ 4 ohms) to run 6.5" kicker CVT's in my front doors.

Thanks for any help you can give me!

Click to read more...

 

[funkyab 10+ year member]

my system should draw about 320A-330A. I will be running a single 250A alternator.

//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 

[Undisputed King 10+ year member]

Well for now actually I will only be running about 220A at full power since the sub amplifiers will be wired at 2 ohms instead of 1. But later I will get a second alternator or something when I get a second sub. So thats why im settling with a 250A for now, but I want to prepare for 350A or so. Furthermor this isolator setup will help me out when I decide to go dual alternators, it will help me out with the charging issue of trying to hook up an aux alternator solely to the aux charging system because I will have no way to connect an exciter to the aux charging system. And basically I want to know if this is possible so I can invest into isolators, or just identical batteries as my stocker.

 

[93LuminaZ34 10+ year member]

A battery isolator is just that it allows each battery to be isolated from the other. It allows one alternator to charge two batteries and keeps each battery isolated from each other so they don't drain each other and if you drain one of them you still have the other one to start the vehicle

 

[Undisputed King 10+ year member]

I know what they are. Thanks though.

If I run dual alternators I would just splice into the exciter from the first alternator for the second alternator, and put both alternator outputs in parallel if you will, and connect those leads to my isolators. It should be like I have one big alternator connected to my isolator/isolators correct?