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Question on auto turn off/on DC-DC battery charging circuit

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faridfauzi

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Hello, im currently designing a 12V battery charging circuit.
The simple summary: This circuit will charge 2 12V battery & when there is power outage, the 2 batteries will supply to the equipment.
The charging circuit is up and running.

But now im given a new task - when the battery is 90-95% fully charged, the battery will be cut off from the charging circuit.
When the battery around 0 -50% of its capacity - the battery will be connected again and the charging started again.

Im stuck on this part. Any suggestion on how to do it?

I hope u can help/direct me to the right direction.
The budget isnt a problem.
 

Just monitor voltage of battery and on 50% voltage level charging turned on.

Lead Acid 12V battery
12,72V-12,73V Fully charged 100% (measured 24h after finished charging process)
11,99V Fully discharged
10,5V Death of starter battery (deep cycle can go to this level)

50% is about at 12,3V

At this level 12,3V microcontroller or some simpler circuit switch charging process on (this can be done without uC).
 
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Thx tpetar & ahsan_eda. I will try it.

@tpetar : Is there any microcontroller that u can suggest me?
My knowledge in electronic is pretty basic for university student, cause im graduate as electrical power student. :|
 
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