12v Automatic Charger (Auto Cut OFF)

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Introduction: 12v Automatic Charger (Auto Cut OFF)

About: youtube.com/hawkarfariq

what is auto cut off battery charger?

some off charger maybe can't stop charging when the battery is fully charged.

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Step 1: Circuit

so we want to show you a simple circuit for the charger when the battery is fully charged, the charging automatically stopping,

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,

the variable resistor used for restricting the voltage from how many volts you want to stop charging!

Step 2: Print

We prepared this circuit for you,

you can download it from the link below

12v Automatic Charger (Auto Cut OFF)


then print it by any printer,

and use any prototyping electronic circuit after that stick the paper to the board,

Step 3: Video

you can see this video and make step by step with this video

3 People Made This Project!

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17 Discussions

0
85sinoda
85sinoda

10 months ago

I created this circuit successfully...and it works well...one thing I notice is that when the battery is about to be fully charge...the relay is tripping and only stop until it fully activate the full charge led...how to stop the tripping sir..i want it to just like it will click just once as it activates...thanks sir...

0
terezkaterka
terezkaterka

Reply 11 months ago

Colin 55 a LED na indikáciu sú kde v Tvojej, akože dobrej schéme?

0
AdityaK201
AdityaK201

Question 1 year ago

All Resistance kitane Watt ka hai plz comment

0
ShreyashH1
ShreyashH1

1 year ago

This circuit contains major fault! Most batteries require intiatial charge current less than .39 Amps this feature is missing and hence may damage battery.

0
terezkaterka
terezkaterka

Question 1 year ago

LED diody sú zapojené opačne, ale inak je prístroj dobrý a trimrom mi idú nastaviť napätia asi 13,8 V - 15 V pri ktorom vypne a napätie pri ktorom zapne asi 10,9 V Požiadajte o informácie, ktoré treba zmeniť, aby bolo funkčné pre 6 V akumulátor. Ďakujem za odpoveď.

0
asifu3
asifu3

1 year ago

Buddy its working good but , Important Question ??? why you are not showing when you are reducing voltage <14.4v . The relay should reactivate when voltages goes <14.4 but its no reactive .

0
altanemre
altanemre

1 year ago

I wonder if battery reduce a value it starts automatically charging?

2
Hamelc
Hamelc

1 year ago

I made this twice and it didn't work. Has anyone made it and had it work hooked up to a charger?

3
ofogh.design

Many mistake on a simple circuit !

1- You have made a many mistake on a simple circuit. The pin's of the LEDs is reversed! Also, red and green LEDs connections to the relay are incorrect on diagram!

2- The first diagram of the film is one thing and the map you are printing is another thing!
3- Finally soldering is another thing! The circuit is wrong and not work. You distract everyone!
4- You've wiped out a very good HD movie. Why put the movie at a small point in the middle?
I ask you if you are really familiar with electronics, once again correct the diagram to show you respect public opinion. I can fix it, but I do not have a channel. It's best to modify it on the diagram below:

1) Modify the green and red LEDs in the connection with the relay.

2) Modify the positive and negative pin of the green and red LEDs that are reversed.

And... when you make a mistake, explain it to others and apologize. Many are here who are not professional and work based on your mistakes. That's not good. The more honest you are, the more visitors you have.
I apologize because I'm talking explicitly.

0
omar_uhh
omar_uhh

Question 2 years ago

Please help me understand how the LEDs will come on? I feel like the LEDs are installed backwards.

0
AristotoC
AristotoC

Question 2 years ago on Step 1

is it applicable to any kind of power source, eg. solar charger or alternator?

0
CarlosV211
CarlosV211

Question 2 years ago on Step 1

Ok. Porém os LED'S não estão invertidos no circuito?

Okay. But the LED's are not inverted in the circuit?

0
MansurK1
MansurK1

Question 2 years ago on Step 1

Как будет выглядеть схема на четырех выводной реле?

0
hawkarFariq
hawkarFariq

Answer 2 years ago

Что ты имел в виду? Я не понял?

0
kamil47
kamil47

2 years ago

It is very nice idea and good working circuit, but I am not very sure, if it is good for charging battery?.
There are 2 problems. The small one, Led diodes could not light. The big problem is voltage detected by transistor. It is not a battery voltage! (Battery voltage should be increased and should initiate cut off function.) If charger is using constant current, battery voltage is the same like battery, but after cut off, voltage of charger depends on its electric properties and could be different like battery voltage. In some cases can recycle charging.

0
hawkarFariq
hawkarFariq

Reply 2 years ago

it's not bad for (10A - 15A ) charger but it's not very smart, known that if the charger connecting to the battery both battery and charger have the same voltage so its no problem if the transistor voltage gives from the charger. at first when you charge the battery the voltage path through the relay if a battery is fully charged not charging else charging it until fully charged.

if you want to make a smart charger you can use LM324 and regulate the voltage at 13.7v for large current and 14,4v for normal current.