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Aaron Cake
Administrator
Canada
6718 Posts |
 Posted - Dec 23 2007 : 10:18:41 AM
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quote:
Originally posted by Rizwan
Do i have to wait until the battery is fully charged to set the charge voltage?
Yes.
quote:
if yes then for the first time, how would i know that now the battery is fully charged?
Measure it with a meter. Your battery will come with a charge voltage either stamped on the case or in the datasheet.
quote:
or i can just connect the battery, switch on the charger and measure the voltage on output terminals (which should be 13.8V for 12V battery) and then wait until LED gets ON?
You will need to adjust the pot initially regardless. Your finish charge voltage may not be 13.8V depending on how you are using the battery.
quote:
and do i have to use the transformer with secondary voltage of 12V or it be slightly higher i.e 13 - 14V?
Use the transformer specified in the parts list. |
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Rizwan
New Member
Pakistan
4 Posts |
Posted - Dec 23 2007 : 1:54:10 PM
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| thanx a lot for the help! |
Rizwan Ul Ahmad Khan |
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Rizwan
New Member
Pakistan
4 Posts |
Posted - Dec 24 2007 : 04:03:36 AM
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hi,
can u please tell me what is the difference between the Automatic Lead Acid battery charger and "Car Battery Charger" which is given on the following link:
http://www.aaroncake.net/circuits/charger1.asp
i am asking about the current rating i.e Automatic charger can provide up to 5A current, as mentioned in an earlier post, how much current does Car battery charger provide? Does it charge the battery faster than automatic charger?
and also guide me which charger is better
thanx! |
Rizwan Ul Ahmad Khan |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Dec 28 2007 : 09:51:58 AM
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The automatic charger is automatic, the other one is not.
The automatic charger is better because of this. |
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albertvd
New Member
2 Posts |
Posted - Nov 02 2008 : 08:49:15 AM
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I have a microcontroller which is powered off 12V. Currently it runs off a 12V power supply plugged into 220V mains. Due to frequent power failures, I know want to change it to run of a 12V lead acid battery. Between the battery and the microcontroller I have a 12V regulator.
To prevent me having to make sure the battery is always charged, I am thinking of connecting a charger to the battery and the battery to the microcontroller:
Automatic 12V Lead Acid Battery Charger
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12V battery
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12V regulator
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Microcontroller
The charger would therefore be remain plugged into mains and connected to the battery. I'm thinking that I would need a diode between the charger and the battery to prevent the circuit from draining the battery when the mains is off.
Would this work or do I have to make some other changes? |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Nov 02 2008 : 10:12:51 AM
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If you put a diode between the charger and battery, the charger cannot sense the voltage level of the battery.
Just use a relay activated by mains to totally disconnect the charger from the battery. |
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albertvd
New Member
2 Posts |
Posted - Nov 02 2008 : 11:06:51 AM
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| Make sense. Thanks. |
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pebe
Nobel Prize Winner
United Kingdom
1078 Posts |
Posted - Nov 14 2008 : 04:17:08 AM
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quote:
Originally posted by Aaron Cake
If you put a diode between the charger and battery, the charger cannot sense the voltage level of the battery.
As long as the battery is charging, the diode will reduce the charging voltage by a fixed amount so you can sense the battery voltage by measuring the charger output. It will equal battery voltage + 0.7V. |
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Topic |
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Automatic LEAD Acid Battery Charger
