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Lead-acid battery solar charger circuit

2016-05-11 06:48  
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This article explains the lead-acid battery solar charger circuit. The circuit is simple but effective. For your more thorough grasp of this principle, we suggest that you can know more about some of the important components of the circuit, for example: LM393,TLC393 . This circuit is used to charge lead-acid batteries and solar panels. Traditionally diode prevents the battery from discharging through the solar panel has been replaced with a field-effect transistor comparator combination. Charger will stop charging once the preset voltage (temperature compensated) has arrived, and start charging voltage drops enough. Load is disconnected when the baterry voltage drops below 11 v and in this connection back to 12.5 v.
This circuit has the following characteristics:
Expenses until Vbat = 13,8 v (adjustable), then float costs;
Close the load when Vbat <11 v (adjustable), resets at 12,5 v;
Temperature compensation;
The use of cheap and readily available components (eg LM393 comparator and BUZ11 FETs;
Using less than 1.3 ma.


Note the funny place of grounding of the first 2 comparators. There’s some weirdness here: this bit of the circuit gives me headaches. Two problems:

If I ground the first two comparators (LM393) in the same place as the third, i.e. not between the FETs, the thing won’t work and the battery will discharge over the solar panel. Why? Am I playing to close to the rails? How can this be remedied/improved/redesigned? Do I need a diode between the comparator’s imputs?If I use micropower comparators like the Texas Instruments TLC393, the comparators blow up spectacularly, but with the standard LM393 everything works fine. Why? What did I miss?

Help would be greatly appreciated!


This one works fine and uses about 0.5mA, but that might improve because I’m not done tweeking yet:



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