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Subject Topic: Old 12v battery/caravan charger Post Reply Post New Topic
Persondiesel_dog
04/9/2009 at 1:19am
 Location: Nottingham
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Hiya everyone, just a quick bit of advice, i recently bought off ebay for the grand sum of a fiver a 12v leisure charger and power supply for my van, it's got no marking it's just in a green big and heavy box with red and blue wire (240v) and a red and black wire (12v) coming out, the previous owner said it worked fine, so i wired a plug in and put a multi meter across the 2 12v wires, a constant 15v output was showing, im a bit worried to connect it to a battery incase it blow's it, i think it's basically a transformer inside the box, would i be ok installing it with a battery attatched aswell, would this lower the voltage, is it outputting 15v as there is no battery attached, hope someone can help, cheer's. Jamie

P.S Just to clarify it look's just like this but the box is green/brown, sorry but im colour blind and mix the two colour's up .

Charger




Post last edited on 04/09/2009 02:08:22


Personmichael
04/9/2009 at 11:37am
 Location: Lancashire
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may help

Looking after your Leisure Battery



-------------
the only silly question is the one you do not ask.


PersonPetemate
04/9/2009 at 12:54pm
 Location: Kennington OXFORD
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Ditto Michael's post - batteries, especially leisure ones, need very carefully-regulated supply. I personally have three chargers - one is the built-in one in our caravan(!!) the second is an old charger similar to what you have (ie four wires and a constant 15v output!) which I have had for years (given to me by a mate following a clear-out from his workshop)- I use this to power a 12v inspection lamp in the garage and to test anything I need to of 12v. The third is a Halfords top-of-the-range (not that dear either) which I have also had for years which I use occasionally to recharge the Roadster battery (that car doesn't come out often) and which I will use occasionally to top up the new leisure battery. It has the optional selector for sealed battery charging and gradually reduces the charge as the battery regains its normal self.
HTH
Pete


Personkeith1664
05/9/2009 at 12:25am
 Location: Norfolk
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With no load applied (ie no lights, fridge, battery etc)your power supply voltage will be a bit high. In fact it has to be higher than the battery volyage to charge it.


Persondiesel_dog
05/9/2009 at 5:56am
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Thank's for your reply's everyone , will give it a go on the battery tommorow :)


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Persondiesel_dog
05/9/2009 at 12:24pm
 Location: Nottingham
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Thank's for all your help everyone, i put 2 new terminal's on the battery today with a multimeter attatched and attatched the supply, flicked the switch with a bit of hope and voila!! 12.9 Volt constant on the screen, going to leave it plugged in for a few hour's on the kitchen worktop see how she goes then i can order my new Leisure battery, thank's for the help everyone :)


Personmerlinvaleting
05/9/2009 at 2:54pm
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glad you got it sorted now mate.


Persondiesel_dog
07/9/2009 at 5:21am
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ok, plugged it in for several hour's and now she's topped out at 14.4v , im kinda worried about gassing, should i be or not?? Cheer's, Jamie

P.S Merlin, get posting on here!!!!!


Personmichael
07/9/2009 at 10:28am
 Location: Lancashire
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ok, plugged it in for several hour's and now she's topped out at 14.4v , im kinda worried about gassing, should i be or not?? Cheer's, Jamie

should be fine,a fully charged battery is 12.7 volts or more.all caravan chargers will only charge to 13.5 volts max.as ours is constant.an external charger will go over this to 14.5 but left standing will reduce by itself.



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the only silly question is the one you do not ask.



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