Hi.
Here is an easy circuit I designed today for a UPS 200Ah battery at home. I'd like to share it to benefit others. Undoubtedly, this circuit measures any 12V battery types and sizes.
The circuit consists of two quad op-amp ICs, the LM324, a voltage regulator, LM7808, several trimmer potentiometers (pots) and resistors and the LEDs. I also added a buzzer (I put a lamp instead in the circuit diagram) to warn for low battery, 'Warning'.
When the battery's voltage is 15V and above, the (top) red LED (LED1) lights indicating for overcharging. As the voltage goes down, the LEDs turns off gradually from the top till LED7. When the voltage decreases under 11V, LED7 turns off and the lower red LED (LED8) turns on indicating that the battery if empty. The buzzer (or warning lamp) starts when the voltage is between 11V and 10.5V, under 10.5V it stops and the "Empty LED" turns on.
Here is an easy circuit I designed today for a UPS 200Ah battery at home. I'd like to share it to benefit others. Undoubtedly, this circuit measures any 12V battery types and sizes.
The circuit consists of two quad op-amp ICs, the LM324, a voltage regulator, LM7808, several trimmer potentiometers (pots) and resistors and the LEDs. I also added a buzzer (I put a lamp instead in the circuit diagram) to warn for low battery, 'Warning'.
When the battery's voltage is 15V and above, the (top) red LED (LED1) lights indicating for overcharging. As the voltage goes down, the LEDs turns off gradually from the top till LED7. When the voltage decreases under 11V, LED7 turns off and the lower red LED (LED8) turns on indicating that the battery if empty. The buzzer (or warning lamp) starts when the voltage is between 11V and 10.5V, under 10.5V it stops and the "Empty LED" turns on.
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