Battery Charging Reminder

Description

Contributor: 
D.Mohankumar

This circuit reminds you when the battery enters into the deep discharge state. It always monitors the terminal voltage of battery, and activates a buzzer when the terminal voltage drops below 11.5 volts due to self discharge. Battery Charging Reminder This is an ideal circuit to monitor the standby battery which is charging occasionally.

 
Battery Charging Reminder Circuit When the battery is fully charged and its terminal voltage is above 11.5 volts, Zener diode conducts and forward bias T1. Green LED remains on indicating the normal voltage level. When T1 conducts, base of T2 will be pulled to ground and it remains off. When the voltage drops below 11.5 volts, T1 turns off and T2 conducts. Red LED turns on and Buzzer beeps.
 
Connect the circuit to a variable power supply set as 11.5 volts and slowly adjust VR till buzzer beeps. Increase the voltage to 12 volts. Buzzer should stop beeping.
 

Comments (3)

Dear Sir,Fewdays back I have

Submitted by Anonymous on Mon, 25/06/2012 - 03:31.

Dear Sir,

Fewdays back I have purchased a Hi Power make (Sothern batteries) IMP1500T, 150AH at C20 capacity for my home inverter. Incidentally, the power cuts have stopped and this inverter came on line for two/three times only after I bought. Now the power cuts have completely stopped and there is no need of inverter.

 

What should I do to safeguard the life and continued long service of the battery? Should I disconnect everything and keep them aside. If so what are the precautions I should take? Please advice. Thanks for your advice, Murthy Varanasi

T2 will never turn off

Submitted by Colin55 on Sun, 10/02/2013 - 11:44.

T2 will never turn off because the voltage across the diode is 0.7v and the voltage across T1 is 0.2v.   The 0.9v will always keep T2 ON. 
None of D.Mohankumar circuits work. Do  not build them. 


Colin Mitchell

TALKING ELECTRONICS  

sir , iam doing my project

Submitted by red1213 on Tue, 12/03/2013 - 10:35.

sir , iam doing my project on  automatic battery capacity tester using 8051 uc.

here, we discharge the battery upto a certain level and then clock is set to measure the time.

we also use a comaparator ckt and compares the voltae level with that of the reference voltage of the omparator and if it is greater than that, then a signal will be sent to uc  8051 .

at the same time the timer is also stopped. then we calculate the capacity of the battery  as (time * current)VAH.

 

 

 

  but sir, iam not able write proper code for this. please guide me regarding this by providing  code.