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Monitor Circuit for 12 Volt
Lead Acid Battery
The steps below are for voltage
monitor circuit adjustments.
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Connect an input voltage of 12.65 volt between
the positive and negative line.
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Adjust the 10K trimmer potentiometer until Led
10 lights up. Lower the voltage and in sequence all other Led's will light
up.
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Check that Led 1 lights up at approximately
11.89 volts. At 12.65 volt and higher the battery is fully charged, and at
11.89 is considered 'empty'.
This circuit, with the components shown, uses about 100mA. Of course you can
adapt this circuit to your own needs by making small modifications. The
circuits above is set for 'BAR' mode, for 'DOT' mode then disconnect
pin 9 from the positive supply rail. The LED brightness can be adjusted up-
or down by choosing a different value for the 4K7 resistor connected at pin
6/7. The diode 1N4001 was included to protect the circuit from a wrong
polarity connection.
Battery monitor circuit.
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