Helpme to find a Battery charger circuit

[mmpaaker]

Hi I am very new to transformer winding. I want to make a my own Battery charger to charge the 12V 100Ah Lead acid  battery.
I hav.e got several MOT transformers and I plan to rewind for 12-0-12v then I try to wind it bifilar type finally I have end with 8v-0v-8v coz no more space to wind.
I was use 10.5 AWG (mm 2.44241) Copper cable.
Now the transformer giving me exact 16v. 8v-0-8v I hope it tase around 30-40 ampere due to its 10.5AWG copper cable.

Now I need a perfect battery charger circuit for this transformer. With Over charge protection.

if anyone having a fully working circuit diagram. please Kindly provide me.

Regards

[6PTsocket]

First, if you use that transformer in a 2 diode, center tap configuration there will not be enough voltage to charge the battery. Only half the transformer is working at any given time so you have a full wave 6 volt transformer. Forget about the center tap and use a bridge rectifier. With diode drops, even 12 volts might not be enough. A 12 volt battery charger transformer is more like 15 volts. With a regulator, you definitely are low on voltage. On the other hand, a 100Ah  battery is best charged at 0.1C which in your case is 10Amps.  Hook your transformer up with rectifiers. Try it both ways.Use an ammeter. See what kind of current you get. I think you'll need to rewind with more turns of thinner wire.

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