Automatic Battery full cut off 12V 20A Battery Charger Using Relay

 Automatic Battery full cut off 12V 20A Battery Charger Using Relay

what is auto cut off battery charger?

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

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

This is a circuit of the auto cut off battery charger, it has only:

- one NPN transistor such as c1815 to control 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 is used to restrict the voltage from how many volts you want to stop charging!

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,

In this video I'm showing you how to make an easy and simple Auto Cut Off Charger For 12 Volt Battery 8ah to 100ah.

There i have used few components including Relay & NPN Transistor.

Input voltage should be fixed at 14.5v

And when the battery voltage will reach 13.9 volts, the circuit will automatically Cut off the charging supply to the battery and saves the battery from over charging.

This circuit is designed to give beep sound also to indicate battery is fully charged.

You can see the bc547 is connected to one end of coil pin to switch relay & when it receives enough current at base it will switch on relay. Usually we use preset to set cutoff voltage but here i have used fixed resistance.

10k connected to positive that provides current to 2.2k connected to base of bc547 to switch but to avoid early cutoff, i used 180+470 ohms to groud the current from 10k Resistor and when voltage reaches 13.9v there current also increases so 2.2 k resistor finally receives some current to the base of transistor, and relay turns on and Cut Off supply to battery.

 Automatic Battery full cut off 12V 20A Battery Charger Using Relay

what is auto cut off battery charger?

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

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

This is a circuit of the auto cut off battery charger, it has only:

- one NPN transistor such as c1815 to control 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 is used to restrict the voltage from how many volts you want to stop charging!

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,

In this video I'm showing you how to make an easy and simple Auto Cut Off Charger For 12 Volt Battery 8ah to 100ah.

There i have used few components including Relay & NPN Transistor.

Input voltage should be fixed at 14.5v

And when the battery voltage will reach 13.9 volts, the circuit will automatically Cut off the charging supply to the battery and saves the battery from over charging.

This circuit is designed to give beep sound also to indicate battery is fully charged.

You can see the bc547 is connected to one end of coil pin to switch relay & when it receives enough current at base it will switch on relay. Usually we use preset to set cutoff voltage but here i have used fixed resistance.

10k connected to positive that provides current to 2.2k connected to base of bc547 to switch but to avoid early cutoff, i used 180+470 ohms to groud the current from 10k Resistor and when voltage reaches 13.9v there current also increases so 2.2 k resistor finally receives some current to the base of transistor, and relay turns on and Cut Off supply to battery.