Decisions, decisions, which dual battery system??

**drivesafe** · 19th November 2014, 10:52 PM

Once again, an AGM would have to be on a constant charger for weeks before it would be damaged by an alternator.

No one drives long enough to have any effect on an AGM, and as soon as you turn the motor off, the battery begins to settle.

This means the charging process will start all over again when you start the motor.

But the problem for your misguided theory is that, as Noki has also posted, the voltage provided by an alternator operate constantly at or above the gassing threshold of 14.7v.

But then again, with literally millions of people, world wide, charging and maintaining their AGMs in all sorts of vehicles and not having problems, where is your proof they will have a problem?

One more point, that confirms your theoretical problem does not exist is the fact that all lead acid batteries self govern the amount of current they will draw once they reach 80% SoC, and again as an alternator does not charge at a constant voltage of 14.7v or more, the batteries themselves will govern the amount of current they will draw once they are fully charged.

So once again, your claims do not match what happens in the real world.

If they did, you would have posted up a link to them.

**Noki 3.9** · 19th November 2014, 11:11 PM

Is this the end ? :P

**Outlaw** · 19th November 2014, 11:46 PM

Does everyone remember the question of the original poster and does the current difference of opinion directly help Nat with his query?

Do we need an adjudicator again?

Originally Posted by nat p

Hay all,

It's time to get a dual battery system. It's a daily driver, I use it to go mud driving, a tiny bit if touring. U don't run a fridge. I do have a winch which gets used pretty much every time we go out, (Yep we have a go at everything).

Do main features I would like is jump start capabilities, winching power would be handy.

Hope this helps. There's a lot on the market and I wanted to see what everyone else runs?\ thinks?

Cheers nat

**Vern** · 20th November 2014, 06:18 AM

Nat and I have pm'd about want he wants, it was easier

.
I'm still waiting to know what our 'expert's' auto electrical back ground is, I know what the others are, we have 25 years in auto batteries, and god knows how many year in auto electronics (sorry tim

), vs ???.

**donh54** · 20th November 2014, 09:26 AM

Well, I've learnt a whole lot of stuff about batteries and alternators!

In a belated attempt to answer the original request;

I have one of Tims' units in the Disco, runs faultlessly with no input from me, just the way I like my electronics to work. I have had previous experience with manual switching setups, as well as a memorable one by a backyard "engineer" using a series of relays and solenoids that regularly caught fire

My recommendation should be fairly obvious.

Sent from my HTC One XL using AULRO mobile app

**Eevo** · 20th November 2014, 10:13 AM

how is it possibly you do all of that and still get some of the basics wrong?

Thread: Decisions, decisions, which dual battery system??

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