Saturday, April 13, 2013

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12 Volt Battery Guardian

Dont get caught with a flat battery; this easy-to-build circuit can cut off the energy to a 12V fridge or automotive stereo device if the battery voltages drops beneath critical level. Electric fridges in trucks and 4 wheel drives are a actually perfect idea but if you're not automobileeful, they are able to severely discharge the battery and go away you stranded. Maybe the battery will end up with extreme injury as well. The same downside applies when you have an important stereo gadget and you like to play it without the motor running.


Main characteristics:
  • Cuts power to load (eg, fridge) when battery voltage drops under a preset stage.
  • 10A rating.
  • Low energy drain.
  • Chirping sound throughout cut-out.
  • Flashing LED indication all through cut-out.
  • Automatically reconnects energy when battery recharged.
Operation on 12V is fine when the motor is working and battery cost is maintained but if the fridge is allowed to run for too lengthy when the motor is stopped, it could neatly flatten the battery in a slightly short time. This is where the Battery Guardian comes into play. It displays the battery voltage and disconnects energy to the fridge sooner than the battery develop intos too flat to allow the engine to be began again.

Parts layout:



PCB layout:


Circuit diagram:




Source: Silicon Chip 6 May 2002

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