24v ???

[Quadstyle]

my main battery in my safari keeps going dead,

i am drawing all my power for radio etc from the the battery that earths to the body and doing this keeps draining it and making it go flat after a couple of days of putting new batterys in , i have replaced them a couple of times and the same thing keeps happening.

i noticed ARB may do somthing to stop this?

just wondering if anyone else has had this probley or knows whatis causing it???

[coxsy]

yes don't put radio on that battery, did the same got very piss being dead when i wanted to 4wd, got it moved to the igntion switch at a auto electrics, no more problems the prs is hook on to it as well

[Hombrey]

yes had the same thing and it killed my batteries. changed to new ones and it started to kill them as well. Went to a sparky and was told a deffinate no no. Have now changed anything 12v to 24 (rear spot lights, thermo fans I inline wired), compressor is 12v but needs 30amps so I run a separate 3rd 12v battery just for that. I don't have a mounted radio yet and just use handheld PRS but would probably either run it off the 3rd battery or get a dc to dc inverter 24 to 12v with about 8amps should cover it. Honestly I put two new 680CCA batteries in and in two weeks I was haviung trouble starting up. Once I changed things over I gave the earthed battery 4 days charging and have had no problems since.

[gary_in_nz]

or a charge equalizer is the way i went. cost about $380 but i have setup a complete new fuse box and 12v system for the likes of radios and things. when in road mode i have my sub and amp all connected and haven't had a problem since. and i run my compressor off that also for when i pump my tires up after a hard days work. easy as to fit, i hate wiring jobs, the equalizer is only 3 or 4 wires to hook up, one to each battery and 1 wire some where else i cant remember off hand.

[tweake]

your lucky not to have killed the altnator.

for some reason when you hook up 12v gear to 1/2 of the 24v bateries the altnators has a habit of dieing. local elecy fixes quite a few trucks due to the RT etc being wired direct to battery intead of useing a 24-12v converter.

[Quadstyle]

yes this all seems to make sence.

is that a 12v converter that is under the dash beside the head desk area?

my problem is im running a sub and amp and i dont think i can wire it up to any where else???


also i think you may be right about the alternator ive noticed the light coming on frequintly now.

[tweake]

one setup i've heard guys do is to have a small 12v battery thats charged off the 24v system. i think the equalizer mentioned before can handle that.

trouble with amps is they can draw up to 3 x their max current rating without blowing fuses. if power is limited to much they clip and distort which apart from sounding like crap can damage speakers.
make sure you have big enough battery and charger.

some of the PWM 24v-12v might do. i've never used one so i'm not sure if they handle the current or more importantly the speed of supply.

[flyingbrick]

yes this all seems to make sence.

is that a 12v converter that is under the dash beside the head desk area?

Yes it is- but its has a very low current supply rating- I think its my cause of shit sound when loud atm and im only using a HU with 50x4w internal amp.

decent 24-12v converters with enough to supply even a 500w amp are like 700$ plus

-Nathan

[Muzza]

or a charge equalizer is the way i went. cost about $380 but i have setup a complete new fuse box and 12v system for the likes of radios and things. when in road mode i have my sub and amp all connected and haven't had a problem since. and i run my compressor off that also for when i pump my tires up after a hard days work. easy as to fit, i hate wiring jobs, the equalizer is only 3 or 4 wires to hook up, one to each battery and 1 wire some where else i cant remember off hand.

Hey Gary
Where did you get your charge equalizer from. 30amp voltage reducers look around that same price.
My main need is to run my 30amp tyre pump.
Is it only an issue with drawing power from the second battery because you are using the vehicles earth.
What happens if you hookup to the first batterys + and - and keep the tyrepump ungrounded from the chassis or is it a problem regardless of which battery you draw from.

[gary_in_nz]

i'm not sure i think you could use the vehicle as the earth and hook up to the positive terminal on the battery that has 12volts across it. maybe some will know for sure, i have always hooked my compressor up to the two terminals on that battery. although now i think about it the amp in the back is earthed off one of the back seat bolts so must be sweet??

[Muzza]

I said

What happens if you hookup to the first batterys + and - and keep the tyrepump ungrounded from the chassis or is it a problem regardless of which battery you draw from.

To help clarify

Drawing from the second batterys + and using the chassis as earth you get 12v BUT this was causing your problems
and
Drawing from the first batterys + and using the chassis earth you get 24v ---
But
If you use the first batterys + as feed and neg- terminal as earth you have 12v but need to ensure the compressor is ungrounded or else it will be 24v

Will this 12v setup of the first battery still cause alternator problems

[albundy]

If both batteries aren't using up the same amount of charge with that charged being replaced equall;y at the same problem you WILL stuff batteries and alternator. Poeple ca either read andf learn oir learn the hard way, some of us have learnt this the hard way.
Al

[Jerry]

Theres a 5 and 8 amp Charge Compensator listed in my Hella book

"A Charge Compensator measures voltage of both 12v batteries. if the battery on the earth has less voltage, the charge compensator provides for compensation power.."

Can find out more if needed

[Muzza]

Thanks guys for clarifying that

[Quadstyle]

Hi jerry,

sounds intresting, you wouldnt no how much they are?


cheers,
Kyle.

Theres a 5 and 8 amp Charge Compensator listed in my Hella book

"A Charge Compensator measures voltage of both 12v batteries. if the battery on the earth has less voltage, the charge compensator provides for compensation power.."

Can find out more if needed

[Jerry]

http://www.hella.co.nz/?t=9&pcid=496


http://www.hella.co.nz/?t=9&pcid=496&sc ... &View=Full

will get a price tomorrow...

[Slideways]

This is interesting. So if I run my 12v tyre pump of the terminals of one of the batteries, it is going to stuff up my battery? Even if its just a couple of minutes?

Also if I run 2 electric radiator fans but one connected to each battery would this still be a problem?

Sorry, I'm new to 24v systems.

[coxsy]

er bollecks use one battery at a time to pump my tyres up since i've had the safari still got good battries

[darinz]

The problem is that the alternator sees the 2 batteries as one so charges it as one battery. If you constantly take more out of one battery it will not get fully recharged so in the long term it will die quicker.
Theoritically if you run one fan off each battery then it SHOULD be fine but you will have to be careful earthing one of the fans or it will get 24v to it!

[DieselBoy]

This is interesting. So if I run my 12v tyre pump of the terminals of one of the batteries, it is going to stuff up my battery? Even if its just a couple of minutes?

Also if I run 2 electric radiator fans but one connected to each battery would this still be a problem?

Sorry, I'm new to 24v systems.

Well, yes and no.

For pumping up tyres, you will be fine, as that doesn't happen often, and over time your batteries will equalise in voltage again. That usually happens when your vehicle is left parked with the ignition off, ie, over night.

Its the constant prolonged draw on one battery that causes the damage.

Provided you have the compressor running of the 12v + terminal and the - terminal on that same battery, everything will be fine.

Saying that, if you pump all four tyres up every day, yes you will root battery on the 12V side.

As for the fans, thats easy

Whats 12 + 12???

24 right??

So you wire them in series and run 24V through them.

In series means you take the + wire from one fan and connect it to the 24v powre source, then take the - from the same fan and conect it to the + wire of the next fan, then the - from that fan goes to earth.

Simple

[flyingbrick]

AND if you do what DB says you can have fun poking sticks into one fan and listening to the other one speed up/slow down

[Hombrey]

Yep I've wired my two thermo fans exactly like that and they work a treat.

[darinz]

Just make sure the fans are identical!

[gary_in_nz]

so on this 24volt thread, i got a subaru water to air intercooler setup to go on my safari, its just the subi water pump is 12volt, would one of the standard Clarion 24v to 12v reducers handle the job. i bought an extra one so i thought it should handle the water pump if that was the only thing it had to power.

[mercutio]

depends how many amps the pump draws when pumping should be stated on the reducer what amps it can handle be careful though sometimes they may state 10 amps but that is a peak load so it might not be able to handle it for a long period

[gary_in_nz]

yeah will check it out, are you able to get 24volt water pumps suitable for the intercooler setup??

[darinz]

There is a full range of 24v stuff but a lot is either truck or marine so can cost a bit!

[mercutio]

yeah can get 24v bilge pumps piece of cake

[tgaguy1]

yeah will check it out, are you able to get 24volt water pumps suitable for the intercooler setup??

Why not run two subbie 12 volt pumps in series?

[darinz]

yeah can get 24v bilge pumps piece of cake

I/C pump runs continuously so you have to be careful with bilge pumps as most aren't continuously rated. Most I/C's only need about 7 to 10 l/per min to keep them cool. Too fast and then you don't get the heat transfer so don't work. A case of more is not necassarily better.