Which dual battery setup?

**Naks** · 24th February 2010, 05:29 PM

Hi all

I was at the auto-electrician yesterday to get a quote for a dual battery system.

The chap reckons that it is better to stay away from out-of-the-box systems like the National Luna, and he advises to just fit a Cole Hersee solenoid (105A) between the batteries, a voltmeter with alarm to monitor the dis/charging, and use proper thick cables to the plugs in the back.

With his setup, both batteries are used for cranking, both are charged at the same time, but they are disconnected when the ignition is off, allowing only the aux to discharge.

Which setup is better? National Luna/Genesyz or this simpler version?

Thanks,
Nakkiran

It'sNotWorthComplaining! · 24th February 2010, 06:41 PM

Originally Posted by Naks

Hi all

I was at the auto-electrician yesterday to get a quote for a dual battery system.

The chap reckons that it is better to stay away from out-of-the-box systems like the National Luna, and he advises to just fit a Cole Hersee solenoid (105A) between the batteries, a voltmeter with alarm to monitor the dis/charging, and use proper thick cables to the plugs in the back.

With his setup, both batteries are used for cranking, both are charged at the same time, but they are disconnected when the ignition is off, allowing only the aux to discharge.

Which setup is better? National Luna/Genesyz or this simpler version?

Thanks,
Nakkiran

Here we go again.

Drivesafe this is your domain.

**agrojnr** · 24th February 2010, 07:25 PM

index7

Say no more

Adam

**Naks** · 24th February 2010, 07:28 PM

Originally Posted by agrojnr

index7
Say no more

Adam

that SC70 box sounds like voodoo to me!? What is it?

**slug_burner** · 24th February 2010, 07:33 PM

Originally Posted by Naks

Hi all

I was at the auto-electrician yesterday to get a quote for a dual battery system.

The chap reckons that it is better to stay away from out-of-the-box systems like the National Luna, and he advises to just fit a Cole Hersee solenoid (105A) between the batteries, a voltmeter with alarm to monitor the dis/charging, and use proper thick cables to the plugs in the back.

With his setup, both batteries are used for cranking, both are charged at the same time, but they are disconnected when the ignition is off, allowing only the aux to discharge.

Which setup is better? National Luna/Genesyz or this simpler version?

Thanks,
Nakkiran

KISS Keep It Simple Stupid principle works for me. Unless your auto elec wants a small boys weight in gold for the set up, go with it.

**Redback** · 25th February 2010, 07:40 AM

I can recommend Traxide Tronics, Tim (drivesafe) is a top bloke to deal with and very very helpful.

Baz.

**agrojnr** · 25th February 2010, 09:42 AM

Originally Posted by Naks

that SC70 box sounds like voodoo to me!? What is it?

I think you mean the SC80 thats the unit I have (tripple batt system) they are quite simple to use

Also as Baz said Tim is very very good to deal with

Adam

**Hoges** · 25th February 2010, 09:54 AM

Hey Chaps
NAKS is on the other side of th Indian Ocean... I twigged to this becaue he spelt "dual" correctly

NAKS, you may have to import the Traxide setup... they do have a reputation for being reliable and robust...
cheers

**Naks** · 25th February 2010, 08:50 PM

Originally Posted by Hoges

NAKS is on the other side of th Indian Ocean... I twigged to this becaue he spelt "dual" correctly

How do you Aussies spell dual then?

Looks like the Genesyz system is the only LRSA-approved one, so will have to go with that one: Interface2

**Blknight.aus** · 25th February 2010, 09:27 PM

the single big relay system is great for a quick need it right now setup.

do it right and you can use it as an short term install while you wait for your traxide unit to rock up and then just drop the traxide in in its place.

about the only downside to the traxide unit is you cant use it to jump your 2 batteries together if the primary battery goes flat (unless they've changed it since the last time I was playing with the older units.)

on the edit...

I just perused the link to the unit you're looking at.

its a control circuit for a pair of relays. you could do exactly the same thing as that kit does with an old ford starter relay, a horn relay a cheap volt meter, some switches and wiring. Probabley for a lot less.

the layout of the diagram also has a potential flaw (well theres 2 but ones more important than the other) in regards to your vehicles battery longevity.

I'd very seriously contemplate giving that product the flick in favor of the back to basics method without the electronic controls Or going the traxide units. If you're not personally inclined to make the effort of calculating out your power consumptions and manually monitoring your batteries, go the traxide.

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