Hello friends,

I want to build a 6v emergency/camping light of 6v sla 4.5ah battery using a 8w fluroscent tube.Thanks to hero999 at this forum i have got to light up my tube. But the part of charging the battery and protecting it from overcharge or deep discharge is still a problem just like "you are ready with your camping kit but don't have your shoe laces tied yet."

For the part of the charging i have heard about uc3906 as a "sla linear charger blah blah..." and for deep discharge protection i don't even have a clue what to do.

So if any could show some way, like giving a circuit diagram for these processes and a brief of explanation of how the circuits work would be great.

Thanks in advance.....

 

I do maintenance of many off the grid solar systems. The optimum word here is emergency backup battery. I an assuming that this light is only used from time time. First of all you can’t over charge a battery, that is say put more current in to it than it can hold. In simple when a battery is fully charge, it is fully charged, And that’s it. Any more attempt to raise the charge is hopeless. It is just turned to heat and short life the battery. No matter the charger. So the term over charging just means heating up the battery. A simple trickle charger or low current charger will do the job. The PWM charger and other are make for multiple cell battery that are use a lot and that may have unexpected heavy discharge . These chargers can equalize the weaker cells and bring then up to full charge by doing what is called a bulk charge. But that is more that you need to know.