Charge.
I took a battery out of an emergency power system in a shop recently.
I want to use it to power a headlamp bulb. So how do I go about charging it with a 12v transformer? I have two wires and a choice of jack plugs to try and connect them to. Or do I just pull the socket off the regulator and connect them with a couple of clips? |
Charge.
Weatherlawyer wrote:
I took a battery out of an emergency power system in a shop recently. I want to use it to power a headlamp bulb. So how do I go about charging it with a 12v transformer? You don't. Buy a 12v battery charger. |
Charge.
On Jun 10, 7:45 pm, JohnW wrote:
JohnW, in article MPG.20d64a3e509a9bbb9897f8 @news.aaisp.net.uk, says... You'll need more than 12v if they are sealed lead-acid, http://preview.tinyurl.com/2359m9 It looks like the little one he http://www.maplin.co.uk/images/Full/MM22Y_MM26D.jpg Thanks. So which way around do the jacks go? (Assuming I can still find them.) I've got one of those Maplin's PW0140 Regulator Power Supply jobs the kind that will work on 3, 6, 9 or 12 volts. |
Charge.
"Weatherlawyer" wrote in message ups.com... On Jun 10, 7:45 pm, JohnW wrote: JohnW, in article MPG.20d64a3e509a9bbb9897f8 @news.aaisp.net.uk, says... You'll need more than 12v if they are sealed lead-acid, http://preview.tinyurl.com/2359m9 It looks like the little one he http://www.maplin.co.uk/images/Full/MM22Y_MM26D.jpg Thanks. So which way around do the jacks go? (Assuming I can still find them.) I've got one of those Maplin's PW0140 Regulator Power Supply jobs the kind that will work on 3, 6, 9 or 12 volts. You need more than 12v to charge a 12v battery. Just use one of these http://tinyurl.com/332a8o Sparks... |
Charge.
"Sparks" wrote in message
... "Weatherlawyer" wrote in message ups.com... On Jun 10, 7:45 pm, JohnW wrote: JohnW, in article MPG.20d64a3e509a9bbb9897f8 @news.aaisp.net.uk, says... You'll need more than 12v if they are sealed lead-acid, http://preview.tinyurl.com/2359m9 It looks like the little one he http://www.maplin.co.uk/images/Full/MM22Y_MM26D.jpg Thanks. So which way around do the jacks go? (Assuming I can still find them.) I've got one of those Maplin's PW0140 Regulator Power Supply jobs the kind that will work on 3, 6, 9 or 12 volts. You need more than 12v to charge a 12v battery. Just use one of these http://tinyurl.com/332a8o Sparks... and how many watts is the bulb, because if it is a 55w bulb, it will probably last for 5-10 minutes on that battery! |
Charge.
In article . com,
Weatherlawyer wrote: On Jun 10, 7:45 pm, JohnW wrote: JohnW, in article MPG.20d64a3e509a9bbb9897f8 @news.aaisp.net.uk, says... You'll need more than 12v if they are sealed lead-acid, http://preview.tinyurl.com/2359m9 It looks like the little one he http://www.maplin.co.uk/images/Full/MM22Y_MM26D.jpg Thanks. So which way around do the jacks go? (Assuming I can still find them.) I've got one of those Maplin's PW0140 Regulator Power Supply jobs the kind that will work on 3, 6, 9 or 12 volts. You need more than 12 volts DC to charge a 12 volt battery - a fully charged 12 volt lead acid is officially 13.2 volts (2.2 per cell). The rule of thumb figure is 13.8v to charge one. But like all chargers it's the current that really matters. You can make battery chargers - but like all such things can usually be bought cheaper than the retail cost of the bits. But if you or anyone else wants to have a go I have some pukka 5 amp 12 volt charging transformers designed for the job - all you'd need is a rectifier and possibly a means of limiting the maximum current. I got a crate of them off Ebay along with some other stuff and you can have one for the cost of the postage. -- *Pentium wise, pen and paper foolish * Dave Plowman London SW To e-mail, change noise into sound. |
Charge.
On 16 Jun, 13:17, "Dave Plowman (News)" wrote:
In article . com, Weatherlawyer wrote: On Jun 10, 7:45 pm, JohnW wrote: JohnW, in article MPG.20d64a3e509a9bbb9897f8 @news.aaisp.net.uk, says... You'll need more than 12v if they are sealed lead-acid, http://preview.tinyurl.com/2359m9 It looks like the little one he http://www.maplin.co.uk/images/Full/MM22Y_MM26D.jpg Thanks. So which way around do the jacks go? (Assuming I can still find them.) I've got one of those Maplin's PW0140 Regulator Power Supply jobs the kind that will work on 3, 6, 9 or 12 volts. You need more than 12 volts DC to charge a 12 volt battery - a fully charged 12 volt lead acid is officially 13.2 volts (2.2 per cell). The rule of thumb figure is 13.8v to charge one. But like all chargers it's the current that really matters. You can make battery chargers - but like all such things can usually be bought cheaper than the retail cost of the bits. But if you or anyone else wants to have a go I have some pukka 5 amp 12 volt charging transformers designed for the job - all you'd need is a rectifier and possibly a means of limiting the maximum current. I got a crate of them off Ebay along with some other stuff and you can have one for the cost of the postage. SLAs have different charging requirement to non-gel cells. They should not be charged with a car or bike charger. Charging v should be significantly lower. NT |
Charge.
In article .com,
wrote: But if you or anyone else wants to have a go I have some pukka 5 amp 12 volt charging transformers designed for the job - all you'd need is a rectifier and possibly a means of limiting the maximum current. I got a crate of them off Ebay along with some other stuff and you can have one for the cost of the postage. SLAs have different charging requirement to non-gel cells. They should not be charged with a car or bike charger. Charging v should be significantly lower. Assuming a reasonably large battery and a normal sort of domestic charger, the internal impedance of the battery will prevent the voltage rising too high to damage an SLA until it is near fully charged. Of course the correct charger should be used, but other methods can be devised for a cheap and cheerful solution as it would appear is needed. -- *Avoid clichés like the plague. (They're old hat.) * Dave Plowman London SW To e-mail, change noise into sound. |
Charge.
On 16 Jun, 22:40, "Dave Plowman (News)" wrote:
In article .com, wrote: SLAs have different charging requirement to non-gel cells. They should not be charged with a car or bike charger. Charging v should be significantly lower. Assuming a reasonably large battery and a normal sort of domestic charger, from the pic it looks like a typical small SLA. A standard car battery charger will charge it, but far too fast, so it wont last well. If youre thinking more of a NiCd charger, that would be ok, if extremely slow. the internal impedance of the battery will prevent the voltage rising too high to damage an SLA until it is near fully charged. Are you sure thats what you meant? Internal R is typically a fraction of an ohm, which will have more or less no effect on charging, and especially so when full and charge i is at a minimum. Of course the correct charger should be used, but other methods can be devised for a cheap and cheerful solution as it would appear is needed. sure. the simplest of which is a wallwart. Or how bout what they recommended in one of my old books, putting the battery across the mains light switch contacts, so its in series with the bulb. Would work on dc mains, until you operate the switch... Would desulphate it too. Good idea? :) NT |
Charge.
In article .com,
wrote: On 16 Jun, 22:40, "Dave Plowman (News)" wrote: In article .com, wrote: SLAs have different charging requirement to non-gel cells. They should not be charged with a car or bike charger. Charging v should be significantly lower. Assuming a reasonably large battery and a normal sort of domestic charger, from the pic it looks like a typical small SLA. A standard car battery charger will charge it, but far too fast, so it wont last well. If youre thinking more of a NiCd charger, that would be ok, if extremely slow. Ah - didn't look at the picture. I just assumed an emergency power source meant a hefty battery. the internal impedance of the battery will prevent the voltage rising too high to damage an SLA until it is near fully charged. Are you sure thats what you meant? Internal R is typically a fraction of an ohm, which will have more or less no effect on charging, and especially so when full and charge i is at a minimum. It limits the current a charger can supply - you'd need a mighty meaty unregulated type which could supply enough voltage and drive a battery without using a series resistor. Of course the correct charger should be used, but other methods can be devised for a cheap and cheerful solution as it would appear is needed. sure. the simplest of which is a wallwart. Or how bout what they recommended in one of my old books, putting the battery across the mains light switch contacts, so its in series with the bulb. Would work on dc mains, until you operate the switch... Would desulphate it too. Good idea? :) ;-) Any port in a storm. -- *When cheese gets its picture taken, what does it say? * Dave Plowman London SW To e-mail, change noise into sound. |
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