Dual Battery Systems

Submitted: Tuesday, May 06, 2008 at 17:01
ThreadID: 57332 Views:5659 Replies:9 FollowUps:10
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Hi all, have been wanting to fit a dual battery system to my 75 series for some time now but just dont know which brand to go. I have heard plenty of good and bad things about all types of brands so i would like to know what everyone thinks of the following couple that i am thinking of using. Redarc, Projecta and ABR Sidewinder (Derek Bester). Has anyone used or know anything about any of the three? Also if my alternator is 100amp does that mean i need a 100amp isolator set up? Thanks
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Reply By: Affordable Batteries & Radiators - Tuesday, May 06, 2008 at 17:12

Tuesday, May 06, 2008 at 17:12
Hi Tukka

A battery can draw heavy amps in its initial charge so best to use one that can cope. Just as a guide a typical AGM will draw C4 or 25% of its capacity when first connected with a surge of about 50 % on top of that if it was used for cranking or is deeply discharged.

For example. If you have a 120 a/h AGM as your aux battery and it is low on charge or it was just used to run a winch it will draw approx 30 amps from the alternator but the initial charge may be 45 amps or as high as 60 amps in some cases fro the first few mins.

It is important to work this out when fitting your batteries and isolator. There are also factors like wire thickness, temperature and distance that will affect the amps drawn. If you can provide more info we can direct you to the correct selection of parts.
AnswerID: 302360

Follow Up By: tukka - Tuesday, May 06, 2008 at 19:30

Tuesday, May 06, 2008 at 19:30
Really only want dual battery for back up for when i am out camping and fishing as its usually really remote and not good places to be stuck. Probably just put another N770Z battery for the better cranking. I will only ever run some lights off it and a compressor. 2nd battery will be mounted not far from cranking battery on same side (havent received battery tray yet kinda unsure how far away), i really wanna go the Redarc system but would i need 100 amp or the 200 amp? I believe you do up wiring and stuff up to suit individuals so i will be sure to use you if thats ok. ( Probably via Ebay) Thanks
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FollowupID: 568431

Follow Up By: Affordable Batteries & Radiators - Tuesday, May 06, 2008 at 20:55

Tuesday, May 06, 2008 at 20:55
MRV70 105 a/h with 760 cca is a good one to use. (Call 1300 BATTERY)

100 amp isolator is fine for one or two of these.
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FollowupID: 568443

Reply By: Willem - Tuesday, May 06, 2008 at 17:16

Tuesday, May 06, 2008 at 17:16
I run dual Century Overlander Cranking Batteries in parallel via a basic $30 solenoid and dash switch. OK, so its not so flash with no bells and whirsles, but it works.

The names you mention have their merits and their cost. I ran a Rotronics(another good brand name) Battery isolator and it lasted 18 months.

A lot of this gear is overpriced finnicky electronics



Cheers
AnswerID: 302363

Reply By: MEMBER - Darian (SA) - Tuesday, May 06, 2008 at 17:30

Tuesday, May 06, 2008 at 17:30
My 05 100 Series GXL TD came from the previous owner (Gov Dept.) with a Surepower controller for the aux battery [ http://www.surepower.com/separator.html ] - very compact and trouble free for my 8 months or so to date - I had a Rotronics controller on my 99 Jackaroo setup for 7 years - totally trouble free too.
AnswerID: 302367

Reply By: Sand Man (SA) - Tuesday, May 06, 2008 at 18:39

Tuesday, May 06, 2008 at 18:39
I have been running a Piranha DBE150S Electronic Isolator for around 7 years now with absolutely no problems whatsoever.

Whatever brand you choose, ensure it is a "smart" Isolator that keeps the starting battery and any other auxiliary battery(s) electrically isolated. This means a fault in one battery cannot affect the other. A "smart" controller is automatic, ensuring that firstly the starting battery has a sufficient level of charge, then swapping over to charge any auxiliary battery or batteries.
There is no chance of human error (forgetfulness) from compromising its operation.

Bill.

Bill


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AnswerID: 302376

Follow Up By: TD100 - Tuesday, May 06, 2008 at 19:15

Tuesday, May 06, 2008 at 19:15
i am running the piranha also,5 years and no issues.just my aux gel slowly dying--if its not one thing its another-hahaha cheers Paul
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Reply By: Trev (SA) - Tuesday, May 06, 2008 at 19:25

Tuesday, May 06, 2008 at 19:25
I bought a duel battery set up for my Hilux from Derek two years ago 80 amp I think. 18 months later it failed in station country north east of Smoky Bay.
When i got home I emailed him and even though it was six months out of warranty he replaced it ,no questions asked,with a 120 amp job. I thought that was pretty good of him.

I run two aux battery's the same size and brand as the cranker
because I was told that the alternator will only see the first battery and if the aux was bigger it would only charge to the capacity of the cranking battery.

Could be wrong, only what I was told. If so don't tear strips off me.

Trev.
AnswerID: 302390

Reply By: Mainey (wa) - Tuesday, May 06, 2008 at 21:14

Tuesday, May 06, 2008 at 21:14
tukka,
Redarc are the manufacturer and of the 3 you nominate would be a good choice as they are probably most widely used.

I would use an electronic isolator, but that's just my choice.

Mainey . . .
AnswerID: 302407

Reply By: Member - Warfer (VIC) - Wednesday, May 07, 2008 at 01:19

Wednesday, May 07, 2008 at 01:19
Hiya Tukka

I bought the IBS (TJM) dual batt system with all the bells and wistles (to scared to say how much i paid lol) TJM where the only ones that could put another batt under my bonnet,things had to move to get it in my Hilux..

Now the monitor is on the left side of my steering wheel (you can put anywhere)..I love it actually a constant look at the battery's performance and if ones flat at a push of a button across to the other...(not that i hav had a flat batt touch wood)

IBS

Oh and you will not go wrong with Dereks advice either (Lovely bloke from what i read)

Just a thought for you..
AnswerID: 302431

Reply By: Timid Trekker - Wednesday, May 07, 2008 at 13:36

Wednesday, May 07, 2008 at 13:36
G'day,
I'm also looking at putting one in (my LC 100s T/D which already has twin batteries). My auto electrician has recomended the BI-80 from Electro Parts. Does anyone know how it compares with the other brands? Barry
AnswerID: 302484

Follow Up By: patrolmann - Wednesday, May 07, 2008 at 14:59

Wednesday, May 07, 2008 at 14:59
looking to put a dual battery in my GQ td patrol in the next few months and Derek seems to be the man to see ??
Can i have his work number please
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FollowupID: 568546

Reply By: Member - Davoe (Yalgoo) - Wednesday, May 07, 2008 at 14:58

Wednesday, May 07, 2008 at 14:58
-allows indepenant starting on each battery to check for problems and subsequent isolation,
-alows independant charging/ discharge
- no electronics to go wrong
- works

AnswerID: 302496

Follow Up By: tukka - Wednesday, May 07, 2008 at 15:51

Wednesday, May 07, 2008 at 15:51
Yeah was thinking of going down that path cause it is so simple but always come across people with flat batteries cause they forget to switch it over. When it is in the Both position does it charge both of the batteries?
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FollowupID: 568557

Follow Up By: Affordable Batteries & Radiators - Wednesday, May 07, 2008 at 15:57

Wednesday, May 07, 2008 at 15:57
Tukka

What year is the 75 series and what engine. I would like to know if it has computers, etc that can be spiked or give you problems with this old switch.

Regards

Derek.

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FollowupID: 568560

Follow Up By: Member - Davoe (Yalgoo) - Wednesday, May 07, 2008 at 16:06

Wednesday, May 07, 2008 at 16:06
same year as this 80 is approx many 000s have this same system. certainly every 75/79 with duel batteries i have driven have the same system
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FollowupID: 568562

Follow Up By: tukka - Wednesday, May 07, 2008 at 16:59

Wednesday, May 07, 2008 at 16:59
1990 1HZ 4.2 Diesel she is. I dont think it has any computers or anyhting, my mate has same car with the cole hersee switch and all my old mans work cars were the same. And the batteries always went flat. Another point is that my daily drive to work is only around 5k there and 5k back so would the batteries even get time to charge in that time with a electronic isolator?
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FollowupID: 568580

Follow Up By: Affordable Batteries & Radiators - Wednesday, May 07, 2008 at 17:04

Wednesday, May 07, 2008 at 17:04
Electronic or Smart isolators are just that. They will top up the battery every chance they get. Fit a sulfarid to the aux if you only do short trips.
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FollowupID: 568582

Follow Up By: tukka - Wednesday, May 07, 2008 at 18:17

Wednesday, May 07, 2008 at 18:17
Righto, thanks heaps fellas and especially Derek. Nothing like getting advice from a pro. Will definitely be in touch when my battery tray arrives to organise a set up. Once again thanks everyone for your info, it all helps no matter what.
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FollowupID: 568601

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