6V 12 V charging question
Submitted: Thursday, Mar 31, 2011 at 16:35
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Member - Mfewster(SA)
I need to use two batteries linked together to give 18V. and I intend using a lead acid 6v and a lead acid 12v
I have a 12v c tek charger. Can I use the charger to charge both batteries if I have them linked together or do I need to get a separate 6v charger?
Thanks
Reply By: Bonz (Vic) - Thursday, Mar 31, 2011 at 16:44
Thursday, Mar 31, 2011 at 16:44
I would charge them seperately, and a 12v charger certainly wouldnt charge them if they were daisychained to 18v
AnswerID:
449864
Reply By: Racey - Thursday, Mar 31, 2011 at 16:45
Thursday, Mar 31, 2011 at 16:45
You need to charge them separately. Unless you can find an 18v charger.
Cheers
Racey
AnswerID:
449867
Reply By: Dennis Ellery - Thursday, Mar 31, 2011 at 16:48
Thursday, Mar 31, 2011 at 16:48
You will need another charger for the 6 volt battery.
Unless your ctek has a 12 and 6 volt setting then you could charge them separately.
AnswerID:
449869
Reply By: Member - Mfewster(SA) - Thursday, Mar 31, 2011 at 16:53
Thursday, Mar 31, 2011 at 16:53
Thanks everyone. I was afraid that you were going to say that.
AnswerID:
449871
Follow Up By: Member - Bruce C (NSW) - Thursday, Mar 31, 2011 at 19:40
Thursday, Mar 31, 2011 at 19:40
Hi Mfewster,
Why not use 2 12 volt batteries in series to give you 24 volts and make up an 18 volt power supply to supply your requirements. You can then charge both batteries together with your CTEK but only set up as 12 volts. In other words, parallel charging. This would require you to remove the device running on 18 volts while the batteries were being charged.
It all depends on how many amps you require at 18 volts.
A bit more info and we could give you some better advice hopefully.
Just a thought.
Cheers, Bruce.
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Follow Up By: Member - Bruce C (NSW) - Thursday, Mar 31, 2011 at 19:47
Thursday, Mar 31, 2011 at 19:47
Yep, got it, 18 volts for the EFTPOS machine = low amps.
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Follow Up By: Member - Niss42 - Friday, Apr 01, 2011 at 13:04
Friday, Apr 01, 2011 at 13:04
G'day Mfewster,
Just a thought, could you use one of those Laptop power supplies from Jaycar or DSE (12vDC to selectable 15, 16, 17, 18, 19, etc vDC) may save a lot oh hassles.
Cheers,
Barry.
FollowupID:
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Reply By: Member - Joe n Mel n kids (FNQ - Thursday, Mar 31, 2011 at 17:17
Thursday, Mar 31, 2011 at 17:17
can i ask why 18V ???
AnswerID:
449876
Follow Up By: Member - Mfewster(SA) - Thursday, Mar 31, 2011 at 18:20
Thursday, Mar 31, 2011 at 18:20
Sure. We are running a market stall. Used to be able to use 240v power but this is no longer available at the site. We need to run some strings of leds that run off 12v. Our eftpos machine uses 18v. We will use a small 12v and a 6v together but just tap off from the 12v for the lights.
FollowupID:
722265
Follow Up By: Member - Joe n Mel n kids (FNQ - Thursday, Mar 31, 2011 at 18:57
Thursday, Mar 31, 2011 at 18:57
is that the "round" plug on the eftpos.... i would look at an inverter for the eftpos, most probally cheaper....
May even be better for the lights as
well,
check to see if it is 12v dc or 12v ac...
Cheers
Joe
FollowupID:
722270
Follow Up By: Member - Boobook - Thursday, Mar 31, 2011 at 19:12
Thursday, Mar 31, 2011 at 19:12
What Joe said.
FollowupID:
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Follow Up By: V8 Troopie - Saturday, Apr 02, 2011 at 01:22
Saturday, Apr 02, 2011 at 01:22
Lots of advise but nobody suggested a DC booster yet. I got them from E-bay and use one to boost 12V from a battery to 24V to run a portable drill to drive a winch. The output is adjustable, it has a 150W rating though for that it may need a bigger heat sink. Anyway, no problems running an 18V battery drill on 24V off a 12V battery.
Oh, it was around $25.-
If you can't find it on ebay email me for the URL.
FollowupID:
722497
Reply By: Member - Murray R (VIC) - Thursday, Mar 31, 2011 at 18:45
Thursday, Mar 31, 2011 at 18:45
Mfewster
If you buy another 6 volt battery you can then put them in series to make 12 volts and use your ctek charger to charge them. Probably easier than trying to find a 6 volt charger and cheaper also.
Murray
AnswerID:
449893
Reply By: gbc - Thursday, Mar 31, 2011 at 19:26
Thursday, Mar 31, 2011 at 19:26
A more stable way of getting 18v is three matching 6v batteries.
AnswerID:
449898
Follow Up By: Member - Mfewster(SA) - Thursday, Mar 31, 2011 at 19:38
Thursday, Mar 31, 2011 at 19:38
Thank you Joe, Murray, Boobook amd GBC. I'm going to rethink this.
FollowupID:
722278
Reply By: Member - John and Val - Saturday, Apr 02, 2011 at 09:03
Saturday, Apr 02, 2011 at 09:03
Suggest just a 12V
battery, and use an 18V laptop car supply to run the EFTPOS. Readily available from Jaycar or similar
places, ebay.
John
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Reply By: Member - Mfewster(SA) - Saturday, Apr 02, 2011 at 10:15
Saturday, Apr 02, 2011 at 10:15
Thank you again one and all. This
forum and the assistance given are great.
Somewhat dazzled by the range of options you have all provided, I went and chatted to my local Jaycar. They have recommended the three 6v
battery solution, or the 12v and one 6v as I already have a 12v charger and could therefore get a 6v charger so I could charge the 6v and 12v at the same time.
My sparky knowledge is low. Further comments?
AnswerID:
450055
Follow Up By: Mike DiD - Sunday, Apr 03, 2011 at 15:55
Sunday, Apr 03, 2011 at 15:55
Yeah, they don't have to worry about keeping 3 batteries charged, and they sell you lots of batteries and chargers.
Jaycar sell good Laptop Supplies that will put out 18 volts from 12 !
Assuming you have access to a 12 volt
battery, this one can put out
3.5 amps and you only need to spend $29.95 !!!!
Jaycar Supply
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