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Topic: Automatic Switching to Battery on Power Failure (Read 722 times) previous topic - next topic

CrossRoads

I've not done anything with charging SLA batteries. I would recommend a commercial unit such as this
http://www.batterystuff.com/battery-chargers/6-volt/UPG6.html
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

winner10920

Charging sla's aren't that bad, they are pretty robust(I toture them often with electrically abusive experiments), probably the most effecient way would be a mosfet, a regular diode would only be worth it at low currents, a germanium diode is better but still has current limitations(as well as heat)
Basically for that size battery you will want to charge it @.3-1amp constant current untill it reaches close to 13.8, then you have it constant voltage @13.8
Easiest way is to use a lm317 although @1amp you will need a heatsink

CrossRoads

Those levels sound kind of high for a 6V 4.5 AH lead acid battery.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

winner10920

Oh wow missed that, thought it was 12v battery,

eloso


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