schematic for charging a 12V15Ahr battery in 10 hrs

12V Charger App Note LM317 full & sw to Tricklle

Greetings,

Here is a link to the TI/National Website PDF that shows a 12V charger that charges
at a set current high rate, then swtches to a float trickle rate.

I have used this charger in a product many years ago and it is quite reliable.
Though it is from the ancient times it works great.

Here is the link directly to the PDF. Look on page 6, 12V Charger.

http://www.ti.com/lit/an/snoa402a/snoa402a.pdf


Also, if you want cheap and dirty here is another link also using the LM317 on page 21 & 22
of the another App note PDF.
Here is the link for that:

http://www.ti.com/lit/ds/snvs774l/snvs774l.pdf

Let me know what you think.

Good Luck, Jamie7

 

You want to get it so that you are providing the 14.7V at 1.5A constant current, though if you want exactly 10 hours or less then you may want to go a little higher on the current, just to get it to voltage in time.

What kind of battery is this? Lead Acid, Nickel Metal, Lithium, etc?

 

Greetings,

For those unfamiliar with the term SLA,

SLA is sealed lead acid.
So it is a sealed lead accid battery.
As for the charger the charger I recommended above
will do the job nicely at the link:

http://www.ti.com/lit/an/snoa402a/snoa402a.pdf

See page 6 on PDF. The circuit has a description of it's operation
and the output is 14.5V @ 2A max determined by the current limit of the
regulator the op amp does the rest and switches the supply to 12.5V to a trickle charge at the end of the charge which will be under 10 hours.

Good luck and enjoy your charger circuit.

Best regards, Jamie7