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 Automatic 12V Lead Battery Charger		  New Topic  Reply to Topic
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erki112
Apprentece

11 Posts
Posted - Mar 18 2011 :  4:22:32 PM  Show Profile  Reply with Quote
i did what you said but nothing changes.expect the current went to 15V .i tried fully charged and empty batteries but charging dosent stop when battery is full. fully charged battery voltage was 12,8 V


I dont know what is wrong with it ,i have messed with this 2 weeks .

Biggest problem is that the charging dosent stop.I charged 1 empty battery wich was 11,8 v to 13V afther that battery started boiling.no charging switch off ???????
Edited by - erki112 on Mar 19 2011 4:59:32 PM
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erki112
Apprentece

11 Posts
Posted - Mar 19 2011 :  4:48:06 PM  Show Profile  Reply with Quote
http://s822.photobucket.com/albums/zz147/nomad3334/?action=view¤t=PCB1.jpg here is pcb and how i connected components.
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erki112
Apprentece

11 Posts
Posted - Mar 19 2011 :  4:52:29 PM  Show Profile  Reply with Quote
here are the links where i bought components





2X http://www.oomipood.ee/?t=k_ki&i=1%2F4W%20330R resistor 330ohm 1/4W

1X http://www.oomipood.ee/?t=k_ki&i=IPMGH%20100R pot 100ohm 1/4w

4X http://www.oomipood.ee/?t=k_ki&i=2W%2082R resistor 82ohm 2w

1X http://www.oomipood.ee/?t=k_ki&i=1%2F4W%20100R resistor 100ohm 1/4w

1X http://www.oomipood.ee/?t=k_ki&i=1%2F4W%201K resistor 1kohm 1/4w

1X http://www.oomipood.ee/?t=k_ki&i=220%2F25PHT capicator 220uF 25V

1X http://www.oomipood.ee/?t=k_ki&i=P600M-MBR p600 diode

1X http://www.oomipood.ee/?t=k_ki&i=1N4007-MBR 1N4007

1X http://www.oomipood.ee/?t=k_ki&i=0.4W%205V6 5.6V Zener Diode

1X http://www.oomipood.ee/?t=k_ki&i=LED5%20G-LC green led

1X http://www.oomipood.ee/?t=k_ki&i=1081316 BT136 TRIAC

1x https://www.elfa.se/elfa3~ee_et/elfa/init.do?item=72-030-14&toc=0 brx49
Edited by - erki112 on Mar 19 2011 4:53:32 PM
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royski007
New Member

1 Posts
Posted - May 06 2011 :  2:28:47 PM  Show Profile  Reply with Quote
i was just wondering, i always thought the charger would have to be around 14V to charge a lead acid battery. but T is only 12V. how come?
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audioguru
Nobel Prize Winner

Canada
4218 Posts
Posted - May 06 2011 :  5:52:36 PM  Show Profile  Reply with Quote
quote:
Originally posted by royski007

i was just wondering, i always thought the charger would have to be around 14V to charge a lead acid battery. but T is only 12V. how come?

The transformer is 12V RMS. its peak voltage is 17V which is reduced to 16V by the recifier. Its average voltage is a little less.

The circuit limits the charging current then the battery limits the voltage.
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rider21
Apprentece

Philippines
8 Posts
Posted - Aug 27 2011 :  02:40:12 AM  Show Profile  Reply with Quote
hi mr. administrator....can u please help me...what components i must change with the circuit if i only want to charge a 9volts battery...r.s.v.p.
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Aug 27 2011 :  06:57:27 AM  Show Profile  Reply with Quote
quote:
Originally posted by rider21

hi mr. administrator....can u please help me...what components i must change with the circuit if i only want to charge a 9volts battery...r.s.v.p.

This is a lead acid battery charger.
There are no 9V lead acid batteries - they go in 2V increments.
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rider21
Apprentece

Philippines
8 Posts
Posted - Aug 27 2011 :  11:45:16 PM  Show Profile  Reply with Quote
ok...but i can i use a lithium battery instead?if i can...what components must i change sir?
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rider21
Apprentece

Philippines
8 Posts
Posted - Aug 27 2011 :  11:47:19 PM  Show Profile  Reply with Quote
is this circuit not applicable for a 9volts lithium battery?
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rider21
Apprentece

Philippines
8 Posts
Posted - Aug 28 2011 :  12:00:50 AM  Show Profile  Reply with Quote
mr pebe...kindly help me....thank you..
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pebe
Nobel Prize Winner

United Kingdom
1078 Posts
Posted - Aug 28 2011 :  03:36:01 AM  Show Profile  Reply with Quote
Like I said. It's for charging lead acid batteries.
Lithium batteries are a totally different breed and need to have a very sophisticated charger.
So,no. You cannot charge a lithium battery wih it.
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rider21
Apprentece

Philippines
8 Posts
Posted - Aug 29 2011 :  01:48:58 AM  Show Profile  Reply with Quote
ok..thanx........
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eddiegeer2001
New Member

USA
2 Posts
Posted - Nov 10 2011 :  9:39:18 PM  Show Profile  Reply with Quote
The led lights up when I first turn on the charger. When I connect the battery the led goes off.
The battery reads around 12.9 volts when I first turn on the charger and then increases to around 14.4 volts.
The voltage will then slowly drop. I turned off the charger when the battery read around 13.8 volts.
The led never comes on when the battery is connected.
What could be the problem?

Thanks for any help.
Eddie
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Aaron Cake
Administrator

Canada
6717 Posts
Posted - Nov 12 2011 :  10:24:45 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
Did you go through the procedure to calibrate R3?
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eddiegeer2001
New Member

USA
2 Posts
Posted - Nov 12 2011 :  11:35:38 AM  Show Profile  Reply with Quote
I set the pot to midway and then turned on the charger. The led lit up and then it went off when I connected a battery.
I measured the battery and when it read 13.8 volts I turned the pot. The led would not light up. I turned the pot both ways.
Eddie
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