Dual Battery Charging

Gday,
A question for the electrical gurus......
Can I charge my auxillary battery with a normal 240 volt battery charger without disconecting my battery leads?
My aux battery has been getting used a fair bit but not getting driven enough to keep it charged, so my fridge has cut out a couple of times.
I use a Piranha DBE 150S MKII battery isolater and am wondering if this will stop the power feeding back to my main battery and alternator while I charge my aux battery? ( with the leads connected)
Or do I have to disconect the leads like I do with the main battery?
Just looking for a quick convienient way to top up the aux without getting tools out. Thought about putting a plug through the grille so I dont even need to lift the bonnet.

Cheers
Hairy
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Reply By: The Geriatric Gypsies - Monday, Dec 29, 2008 at 14:16

Monday, Dec 29, 2008 at 14:16
goodday hairy
hows the crayfish?????
i charge mine as you describe all still connected as i believe the pirhana should stop any back feed

steve
AnswerID: 341719

Follow Up By: Hairy (NT) - Monday, Dec 29, 2008 at 14:27

Monday, Dec 29, 2008 at 14:27
Yummmmmmmm.......might have to grab a beer to wash it down.

Cheers
0
FollowupID: 609380

Reply By: Rockape - Monday, Dec 29, 2008 at 14:30

Monday, Dec 29, 2008 at 14:30
Hairy,
I have a manual isolator and charge mine the isplator on so it charges both batterys.

The only thing I don't do is start the engine while I am charging the batterys.

AnswerID: 341723

Follow Up By: Rockape - Monday, Dec 29, 2008 at 14:32

Monday, Dec 29, 2008 at 14:32
And I haven't even had a drink yet, that should read.
I have a manual isolator and charge mine with the isolator on so it charges both batterys
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FollowupID: 609384

Follow Up By: Hairy (NT) - Monday, Dec 29, 2008 at 14:44

Monday, Dec 29, 2008 at 14:44
Gday,
Ive always disconected any battery before charging.
Are you saying its fine to charge your battery without disconnecting leads , as long as you dont try to start your engine?
Ive got an 80 series petrol....couldnt it spike the computer or stuff something electrical?

Cheers
0
FollowupID: 609386

Follow Up By: Rockape - Monday, Dec 29, 2008 at 17:01

Monday, Dec 29, 2008 at 17:01
Never disconnected my battery leads except on my yacht, besides the isolator being off, I would still have to disconnect the negative as the charger used to eat out my anodes because it was a cheap half wave unit.

At work if we get a flat battery which is every 2nd day (leaveing lights on sure flattens them) We just bring another cruiser up besides it and use jumper leads with the engine running. This is the same for the other units at work, 79/200series/Nissan patrol 3litres/narvaras and a rodeo,all of which have computors.



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FollowupID: 609397

Follow Up By: Hairy (NT) - Monday, Dec 29, 2008 at 18:23

Monday, Dec 29, 2008 at 18:23
Cheers
0
FollowupID: 609408

Follow Up By: Member - Roachie (SA) - Monday, Dec 29, 2008 at 18:53

Monday, Dec 29, 2008 at 18:53
Same here. I have 3 batteries on the Patrol and a permanently mounted/wired 15amp 3 stage Durst battery charger. The charger has 2 separate outlet circuits. Two of the batteries are permanently connected (for starting the big Chev diesel plus all the other usual chores of a stater battery), whilst the 3rd battery is a Fullriver 120a/h Gel which runs things like fridge, lights, HF etc etc.

Now, the 3 stage charger is switched on whenever the Patrol is sitting idle in the carport (which is far more often than I would like!!! hahaha) and I have never disconnected the batteries whilst charging.

Like Rockape, I don't start the donk with the 240 volts on....well I have done it by accident a couple of times...... but hasn't caused any hassles.

Of course, my patrol doesn't have any computer chips to get fried either.

Cheers mate

Roachie
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FollowupID: 609412

Follow Up By: Hairy (NT) - Tuesday, Dec 30, 2008 at 10:35

Tuesday, Dec 30, 2008 at 10:35
Gday Roachie,
Permanently mounted under the bonnet battery charger.....mmmmmm, thats got me thinking?????

STOP IT!!!!!! Ive got enough under my bonnet....Ill go back to mounting it on the wall of my shed.

LOL
Cheers
Hairy
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FollowupID: 609499

Follow Up By: Member - Roachie (SA) - Tuesday, Dec 30, 2008 at 21:21

Tuesday, Dec 30, 2008 at 21:21
Hairy,
I should have added that I only have space under the bonnet for ONE battery. The other 2 batts plus all the associated leccy gear (240v charger and the Arrid Twin Charge etc) are all located in the cargo box on the back of the dual cab.

Cheers

Roachie
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FollowupID: 609577

Reply By: Old Bill - Monday, Dec 29, 2008 at 16:48

Monday, Dec 29, 2008 at 16:48
Hairy

Have a look at Post 60826 of 17/8/2008.

It may give you more information that maybe of assistance.

I have been doing what you suggested for years, with no problems.

Take care.

Bill
One life. Live it while you can.

Lifetime Member
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AnswerID: 341737

Follow Up By: Hairy (NT) - Monday, Dec 29, 2008 at 18:24

Monday, Dec 29, 2008 at 18:24
Thanks Bill,
Answered my next question too.
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FollowupID: 609409

Reply By: autosparky - Monday, Dec 29, 2008 at 18:08

Monday, Dec 29, 2008 at 18:08
it should be fine
AnswerID: 341744

Follow Up By: Hairy (NT) - Monday, Dec 29, 2008 at 18:24

Monday, Dec 29, 2008 at 18:24
Cheers
0
FollowupID: 609410

Reply By: Hairy (NT) - Monday, Dec 29, 2008 at 18:25

Monday, Dec 29, 2008 at 18:25
Gday all,

Sounds like the general consenses is it wont be a problem to charge without takeing off the leads.
Thanks for the replies.

Cheers
Hairy
AnswerID: 341747

Reply By: Road Runner - Monday, Dec 29, 2008 at 19:10

Monday, Dec 29, 2008 at 19:10
G'day Hairy,

I never disconnect the battery leads. From my limited experience of electrics, it shouldn't be a problem as a battery in the circuit acts like a large capacitor and will absorb any voltage spikes that would normally flow on to the rest of the system.
AnswerID: 341751

Follow Up By: Hairy (NT) - Monday, Dec 29, 2008 at 20:59

Monday, Dec 29, 2008 at 20:59
Yeah mate...and like I think Derek said in a previous post....as long as you conect the earth last and dont arc anything it shouldnt be any different than your alternator charging it while your driving.

Cheers
Hairy
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FollowupID: 609433

Reply By: Member - Phil G (SA) - Monday, Dec 29, 2008 at 22:41

Monday, Dec 29, 2008 at 22:41
No need to lift the bonnet. Just hook up the charger to outlets inside the vehicle.
AnswerID: 341789

Follow Up By: Hairy (NT) - Tuesday, Dec 30, 2008 at 10:39

Tuesday, Dec 30, 2008 at 10:39
I was thinking about doing that with my solar panel ????
I could do with another plug toward the front of my car anyway.
Cheers
0
FollowupID: 609500

Follow Up By: Member - Phil G (SA) - Tuesday, Dec 30, 2008 at 16:15

Tuesday, Dec 30, 2008 at 16:15
The cable going to the outlets just needs to be heavy enough for the current going in from the charger or panels.
Obviously can't hook a 20amp charger up a 10amp cigarette socket circuit, but the current from a couple of regulated solar panels won't be enough to cause a problem.

I have a 40amp fused 8Ga cable from each battery to the cab and canopy so I just hook up to any of my outlets.
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FollowupID: 609545

Reply By: Von Helga - Tuesday, Dec 30, 2008 at 07:58

Tuesday, Dec 30, 2008 at 07:58
I sort of assumed the answer was no harm to be done.
I use 4 amp Waeco/Blue Apple charger connected to my aux in my shed to run up my CF50 to freezing in the car prior to a trip without removing any connection from my battery's connectors.
I have also in the past given my main battery a full charge whilst in the car and connected, i'll admit I had not considered if that may be unwise for the starter battery side given alternator circuits and the like. I'll continue with that though till I hear different.
AnswerID: 341811

Follow Up By: Hairy (NT) - Tuesday, Dec 30, 2008 at 10:40

Tuesday, Dec 30, 2008 at 10:40
Yeah...Im convinced too, Im going to make something up today.

Cheers
0
FollowupID: 609501

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