Battery Current Alert


The Battery Current Alert watches ripple currents induced by the rectifier in a VRLA or other lead acid systems to determine battery health.

It sets off an alarm if the ripple is too high or too low which could indicate a problem with the battery system of rising impedance if the current is dropping or bad filter capacitors in the rectifier if the current is rising.

It uses a picaxe 14M microprocessor, precision reference, precision rectifier (personal hybrid design using a ZXCT1041- see U1,C1,C2,R7-R9.)

The final design replaced the dip switch bank and led shown in the drawing with 2 toggle switches and a buzzer.

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