dual batteries

Submitted: Monday, Mar 24, 2003 at 12:24
ThreadID: 4013 Views:1864 Replies:7 FollowUps:12
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I know this question has been asked before and i have looked through the archives.I just recieved a price from Rotronics for a system for my GU patrol for $865.00 this does not include a battery tray or battery. This system seems to be the one most people suggest to install surely there must be an alternative.I will be running a fridge and lights when camping maybe a gsl system and solar would be cheaper.please help as i find it hard to part with such a large amount of cash for a system that some people is not worth the money.Could exploroz please give me his opinion on what system to install.
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Reply By: Voxson - Monday, Mar 24, 2003 at 13:54

Monday, Mar 24, 2003 at 13:54
I am running a 40litre engel fridge on almost freezer settings and it is still going each morning when i get going for the next days drive and if i want to stop for more than two days i have to back it off towards fridge settings.

My front and rear battery in parallel together with the rear being switched through a 70amp relay so when the key goes off the only battery doing the work is the rear. After the relay towards the rear is a fuse for just in case.

When the rear battery does eventually run flat i just turn the key and away we go again. The alternator charges the rear battery perfectly, even though the front is also getting charged at the same time.

The rear battery is a gel-cel.

I use the winch, cb, uhf, cd player with the front battery and havent had a drama yet.

$450 including batt, cables, relay, etc etc...and tray......Fitting extra....Easy though........

People will bag me here for using a gel cel with a wet batt,, but the bottom line is....... IT WORKS WELL......

Countin the days till July 5th. *Cape York Trip*
AnswerID: 15967

Follow Up By: rors101 - Tuesday, Mar 25, 2003 at 18:30

Tuesday, Mar 25, 2003 at 18:30
Makes sense to me - As gel cells like to be chagred at a slightly lower voltage therefore it will reach a full charge before the starter battery. There may also be a slight voltage drop if it is the rear that will also be compensated for.
In camping / travel mode it should work better than two equal cells. Just make sure that during everyday use or once its fully charged you disconnect the two so the gel isn't constantly over charged.
FollowupID: 9835

Follow Up By: Voxson - Tuesday, Mar 25, 2003 at 20:42

Tuesday, Mar 25, 2003 at 20:42
Hi rors.. i have a quick disconnect plug for doing just that... :o)_____________________________________________
Countin the days till July 5th. *Cape York Trip*
FollowupID: 9844

Reply By: Member - DickyBeach - Monday, Mar 24, 2003 at 14:23

Monday, Mar 24, 2003 at 14:23
Dear Mr Blogs,
Have alook a few days ago at #3993 on this very subject.
AnswerID: 15969

Reply By: ThePublican - Monday, Mar 24, 2003 at 16:52

Monday, Mar 24, 2003 at 16:52
At $865 you are getting RIPPED of chronically,, opposite lock in Brisbane sell the Rotronics system for $295 + $50 for an extended wire kit ,takes 1/2 to 1 hr to self fit ,, system is so simple and straight forward a 4yr old can read the fitting instructions.
AnswerID: 15975

Reply By: Rod - Monday, Mar 24, 2003 at 17:11

Monday, Mar 24, 2003 at 17:11
Depends on what model Rotronics system you buy. Sure, the base model is less but it takes longer to recharge the batteries. I paid around $900 for mine 2 years ago. Great system and after sales service. And no, I am not Rod Street from Rotronics. We just share the same first name.
AnswerID: 15976

Follow Up By: ThePublican - Monday, Mar 24, 2003 at 17:46

Monday, Mar 24, 2003 at 17:46
Rod , I actually charge 3 batts with our "base model",,850 cca start, 850 cca aux in vehicle and another 750 cca in camper, have run both aux down to 11.25 volt,, started vehicle and let idle ,20/25 min, all 3 batts fully charged 13.85 volts,, all 3 batts same age and make [ 3 yrs young ],,, would be interested to know how much quicker your system at 3 times the price is,,,PS, Ford Explorer altenator 14.58 volts /145amps at idle ,500revs.
FollowupID: 9767

Follow Up By: Rod - Wednesday, Mar 26, 2003 at 10:16

Wednesday, Mar 26, 2003 at 10:16

Got to admit. That sounds pretty good. Good luck to you.
FollowupID: 9884

Reply By: Michael - Monday, Mar 24, 2003 at 17:33

Monday, Mar 24, 2003 at 17:33
Hi there, Why not just buy a battery holder from ARB, about $120 and some starter cable and wire the batteries together in parallel. buy a normal starting type battery and a manual isolator for $8 and disconnect the second battery manually before you go to bed. It will give you some time to work out what way you want to go. Thats what ive done with my GU, BUT i have a liemack fridge and it has its own voltage cutout and it draws down evenly on both batteries. But still would be ok for your application. hope this helps Michael
AnswerID: 15977

Follow Up By: Phil P - Monday, Mar 24, 2003 at 21:32

Monday, Mar 24, 2003 at 21:32
Hi Michael,

Did the ARB Battery tray fit without drilling additional holes in your GU ?

Do you have the 3.0L TD ? Safety Pack ?

Phil P
FollowupID: 9779

Follow Up By: colin - Tuesday, Mar 25, 2003 at 13:04

Tuesday, Mar 25, 2003 at 13:04
Hi Phil have done the same as micheal, run everything off the starter battery including fridge and lights and have an anderson plug between second battery, when i pull up disconect second battery. The one battery lasts about 3 days in the tropics and still can start the 4.2 diesal on the sme battery, for longer stays i run the motor at about 900 revs for about an hour daily and if any thing goes wrong plug in the anderson plug and start of the second battery, and my alternator is only a 50 amp. i have been doing this for 10 yrs had no problems and usually get about close to 3 yrs from the battery. I also change over the batterys every 6 months .Col
FollowupID: 9828

Follow Up By: Michael - Tuesday, Mar 25, 2003 at 14:43

Tuesday, Mar 25, 2003 at 14:43
Phil, i have a 4.2 d with no abs and airbag, i am not really familiar with the layout of 3,0l d, i think i drilled 1 hole from memory. arb is made fairly well, and well priced. Michael
FollowupID: 9831

Follow Up By: Michael - Tuesday, Mar 25, 2003 at 14:55

Tuesday, Mar 25, 2003 at 14:55
Hi Colin, i leave both batteries connected as is said i have voltage cutout on my fridge but i can disconnect the auxilially Battery if needed. It is not hard to get used to connecting or disconnecting as most 4x4s have the bonnet up for showers or just to see if anything has fallen off and for fluid level checking. I think the money can be better spent elsewhere, not to mention if the solenoid fails. Simplicity is the best system. I also buy 2 new batteries every 12months, normal starting batteries,$100 each from Birkinhead batteries, N70ZZ they work fine. A lot is made of solenoids and expensive batteries to no real advantage. Regards Michael
FollowupID: 9833

Follow Up By: colin - Tuesday, Mar 25, 2003 at 19:08

Tuesday, Mar 25, 2003 at 19:08
hi mike totally agree simplicity is best. I do a lot of camping where there are no other vehicles so always disconnect 2nd batt, for piece of mind also have auto cut out on fridge. I use yuasa batteries and the extra price is worth the extra 2 yrs and reliability. The money i saved i put into buying a decent aussy made fridge freezer ie an explorer as the insulation is far superior than imported brands which leads to lower power drain on the batteries, more piece of mind . Cheers Col
FollowupID: 9838

Follow Up By: GaryInOz - Wednesday, Mar 26, 2003 at 12:16

Wednesday, Mar 26, 2003 at 12:16

The only issue some people would have would be cramped space for a second battery, so the need for smaller batteries of equivalent performance to "sloppy" lead acid, or batteries that can be installed in other-than-normal orientation. The alternative types of batteries may also last longer and be able to sustain more 100% deep cycles than even the best lead acid. Having used "Odyssey" batteries in UPS and emergeency lighting situations (actually to provide "quiet" power overnight - no generator - for a friend) I can personally attest to their reliability (2 yrs daily use so far), and I would imagine the other sealed compact types would be of similar quality. It just seems like false economy to pay $200 a year for "sloppies" than spend $670 (Odyssey v1000 (46Ah)x 2) or if you have the room $870 (Odyssey v1500 (77 Ah)x 2) for maintanance free batteries that will have a usable life of 5-8 years, and can be recharged in less than 1 hour from dead flat WITHOUT damage (alternator premitting, and no, you won't burn that out either) No sulphating, no top-ups, lighter- you can treat them like dogs and they come back for more.

I am not an employee or representitive of Odyssey batteries.
FollowupID: 9896

Follow Up By: Michael - Wednesday, Mar 26, 2003 at 13:56

Wednesday, Mar 26, 2003 at 13:56
Hi Gary, we all have our ideas about what is best for a situation. Batteries can fail for a number of reasons and i can replace standard ones, almost anywhere in this big country. The smallest town with the smallest service station will have two. Its really that simple for me. That doesnt mean that i'm right, it means we all have a diferent view on things. I bought a white patrol because its a cool colour, some people buy dark blue because it looks better but are not worried that they may fry in it, yes white is boring BUT its all a matter of how you suits the individual. Best regards Michael
FollowupID: 9903

Follow Up By: colin - Wednesday, Mar 26, 2003 at 17:18

Wednesday, Mar 26, 2003 at 17:18
Hi Gary i dont have a problem with space gq patrol, but would have to question value for dollars $220 per battery for three years running figures better in my book and i also give them heaps and they handle the drain with no problems , may be more maintainance but that is on par with the rest of the vehicle. Regards Col.
FollowupID: 9913

Reply By: Member - AndrewPatrol - Tuesday, Mar 25, 2003 at 10:33

Tuesday, Mar 25, 2003 at 10:33
Cost me about $560 for Piranha, tray and battery for my GU. Watch the spike factor if you go with the cheaper alternatives, especially if you have computers for engine management.
AnswerID: 16047

Reply By: OzyTravelingAussie - Tuesday, Mar 25, 2003 at 13:03

Tuesday, Mar 25, 2003 at 13:03
Hi Joeblogs,
I have a dual battery system comprising of 700cca starter, two DC27 Delkor Deep cycle batteries (@$135 ea) wired in parellel, with a Pranha Electronic Battery DB150s isolator system ($150 ??) This system has the benifit of a 80 watt solar panel to charge it while I am camped for weeks at a time, running the fridge and lights.
Enjoy your trip.
AnswerID: 16064

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