As soon as this LED shuts off would indicate battery fully charged and is disconnected. The circuit has an auto cut off feature when the battery is fully charged. It’s my pleasure Habtanu, please keep up the good work! You can charge the batteries from 2-8 pcs, depending on an input voltage. Apply a relatively higher DC potential at the input of the IC LM338, may be a 9V or a 12V input. I now made a new diagram for this 3v, 4.5v, 6v, 9v, 12v, 24v, automatic charger. Hi again…I remade the circuit again, and i designed it the same way as it is in the circuit scheme, so the pot under LM338 is adjusting the output voltage, but the diodes are ALL DEAD, (no matter if there is connection between pin#3 and pin#9 for graph bar mode) and the pot undr LM3915 is doing nothing…Can i ask you to chek the connection lines – this is the pic i uploaded in some web site for uploading photos: s22.postimg.org/rdai1fw5t/20150828_112454.jpg. The following circuit will allow you to charge any battery right from 1.5V to 24V simply by setting up a given preset. this is a circuit of the auto cut off battery charger, it has only:- - one NPN transistor such as c1815 for controlling the charging, - relay for cutting off this current path through the battery after fully charged, - 10 kilo-ohm variable resistor connected to the base of the transistor, i am having littlebit knowledge of electronics. LM338 has an overload, overcurrent, short circuit and over heat protection, so this IC cannot get damaged with any kind of output fault…but the input should be increase beyond 35V and polarity should not be reversed. This circuit will give adjustable DC supply output and charges battery ranges from 6 volt to 12 Volt. keep the scr section blank, gate open….now check the output from the LM338 IC..check the collector voltage of the BC547 transistor….check the emitter voltage of the BC547…check the voltage at pin#5 of the IC. I am a novice in electronics, so here is the question? Your email address will not be published. But how does this work out for 2pcs 12 volt AGM batteries in series (24 volts)? I am using the circuit no 2. the circuit with BC 547 replced the SCR which is in this link:https://homemade-circuits.com/2013/08/3v-45v-6v-9v-12v-24v-automatic-battery.html. Lead Acid Battery is a rechargeable battery developed in 1859 by Gaston Plante. and still want to know why to use R4? The main advantages of Lead battery is it will dissipate very little energy (if energy dissipation is less it can work for long time with high efficiency), it can deliver high surge currents and available at a very low cost. I am not sure about the motor, because normally a motor will never burn unless the input voltage exceeds the motor's rated value, hi SWAGATAM is it safe to use that circuit to charge lithium polmer batteries, yes it is safe, just make sure the input current is below 50% of the battery mAH rating, Hi,sir i want to make a Transformer for my 24 volt battery,i need 10 amp charging for my 24 volt battery can you please send me the number of Primary and Secoundry turns…?Input Voltage is 220and i need 10 amp for my 24 volt battery.Thanks, Hi Sir, I am here again.. I have always used the following design with an LM338 IC with no issues, https://homemade-circuits.com/2012/04/how-to-make-solar-battery-charger.html. It's better to use 50nF, if you use other values then you may have to select the corresponding pot of a different range which will need to be calculated. Abhishek, yes you can but a 12V panel will not charge a 12V battery. hello sir, pls i have few questions to ask 1. can i use LM3914 instead of LM3915? Can i use 3.9v zener diode instead of 3v? After this the LEds connected at the output linearly indicate the charge level of the battery by illuminating in sequence, and finally when the last LED is lit which happens when the battery gets fully charged, the SCR is triggered shutting off the charging process permanently until the power is reset. the emitter voltage must be equal to the zener voltage at its base…..you can also try increasing the base resistor of the BC547 to 1K and check the procedure again. 2) for the LM338 pot, use the middle pin and any one of the outer pins, exclude the other outer pin (don't use it). Just make sure to connect a resistor in series with the positive of the battery, the value may be calculated with the help of Ohms law as given below: watts = 1 x 0.1 = 0.1 watts…1/4 watt will do the job. Also, i wish you all the best, personaly and proffesionaly. Read 6v Battery Charger With Auto Cut Off Circuit Diagram PDF on our digital library. so please do not force higher voltage across it, it will only damage the battery in the process. One more question is that in the diagram, i saw u are using 15-24V DC input. I use it for 12V 7AH battery and lower. https://homemade-circuits.com/2012/07/make-6v-4ah-automatic-battery-charger.html. if i want to use a 9V,1A to power the circuit outside?So the circuit has two alternatives to power. 1.Increase the value of R3 to 33K. Thank you Anderson, I appreciate your interest and efforts, however it seems the link you have sent was not set to the shared mode, and therefore it isn’t opening at my end. i want to ask alittle you said that if one wants to charge batts above 50Ah he should think of adding a transistor say TIP. what does ground mean in this circuit?? It will be appropriate for Ni-Mh accumulators, which charge at constant current? This battery charger circuit provides the Automatic cut off the facility when the battery gets fully charged. OK, thanks for the suggestion, I'll surely investigate the concept and post it soon. ### NOTE: I've not connected the battery yet. current on ammeter. And also…i bridged collector of 557 (there is 1.7V when it's closed) with the gate without LED and resistor, but when 557 is closed, these 1.7V drops to 0.4V so the gate can not close. If i want to lit up all the LED up to the respective pin of battery full position at LM 3915' should i increase the wattage of the zener and the resistor to 2watt. Hi, please specify battery bank voltage, current, and solar panel voltage, current, I’ll try to help! So according to my requirement which is 1. thanks. When the battery gets fully charged the solar panel keeps running and this can result in battery getting deep discharged which will shorten its life. The term auto cut off means that the circuit will automatically... 5V, 6V, 9V Automatic UPS Or Battery Backup Project. Is that normal? however, when i touched the Ry which is current control resistor, it is very hot. Hi Swagatam,It is me again. This is to limit the current going to LM317 before the transistor turning on. … The resistores in this circuit, I presume all 1/4W… or is there one or more that isn't? Connect the base with collector via a 1K resistor, connect the base to ground via a 10K preset. When the relevant pin of 3915 is active, the beeper that i installed is sounding, but the led doesn not light up. 3. Here Battery charger circuit diagram designed by implementing adjustable voltage regulator LM317 with auto cut off feature. The second point is not so clear, a schematic will be needed to answer it correctly. Or, Smart Automatic battery charger Circuit for 12v Lead-acid battery. If you continue to use this site we will assume that you are happy with it. Adjust the 10K preset under the LM338 such that the battery terminal points receive a 7V output. if the main power is not there then will be diverted to battery power. Hi Adrian. Frequency Modulation reaches several meters to kilo meter with low …, This LDR switch relay circuit eliminates the physical contact with …, Here we added sound with visual output, yes the LED …, In some case we need temperature dependent output or temperature …, Emergency lights are very crucial in some situations, the traditional …, In this circuit LM3914 bar graph decoder IC used for …, Battery charger circuit diagram with auto cut-off. check the inverter without any load, if it stays quiet would indicate towards a mismatch or overload issue…if without load also it makes noise then the transformer could be assumed to be defective.
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