12v Automatic emergency light circuit with battery charger 

Thanks for watching 🙂

Of foh yar, i had the 1n5408 diode reversed. All good. Working well

Thanks 😊

For 12v battery input should be 13v-13.5v

@@CreativeTechos thx

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Use battery with bms

1N4007 Diode need to be used accross coil pins with reverse polarity, instead of 1N5408 use 3x 1N4007 in parallel

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Yes it can be used, In day time it will remain off and in night time it will turn on with battery backup.

It had problem due to the song played during testing, so i conducted new testing, and will get uploaded afternoon

@@CreativeTechos Ok thanks

My pleasure 😊

Yes, you can use

Since relay is 12v, so it needs DC 12v input from charger

@@CreativeTechos ohs? So possible it can over charge while there is no black out? Do you have an circuit sir auto on when it comes happen black out?

I have uploaded several autocut off charger with mosfets, I'll try to soo upload the video of emergency light with auto cutoff after full charging battery

For reference pIn 4 is NC & pin 3 is NO

According to the diagram, while the charger is active leds will use up the battery. Those who are willing to do this circuit should concider pins 3 & 4 in reverse. Or led+ should be connected to NC pin. And 1N5408(-) should be connected to NO pin.

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​@@CreativeTechos😊😊.

It protects the relay from high voltage spikes while switching

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Sorry for mistake, yes it is SPDT 12v relay also know as sugar cube relay

Thanks for writing, IN4007 with reverse polarity is important between the coil pins to protect circuit from current spikes that gets generated during switching, Also IN5408 diode is used to block reverse positive flow to input dc terminals

Yes absolutely but in diagram it is in off state.

Yes, you can install, but what help you want from me, mention if problem is persisting.

@@CreativeTechos I have light (40 watt)battery (12v)and button How to joint them

See if you want to turn on light with brightness control, this circuit is for that you can use input dc as 12v battery and light 12v 40w at output. Installation of good size heat sink is recommended for mosfet.

Thanks

My pleasure 😊

Yes, it depends on the availablity, the 1N4007 is always used for the relay coil protection against voltage spikes, and instead of 1N5408 you can use any 3A diode with above 20v, even Schottky diodes is best with low voltage drop.

@@CreativeTechos a small 1N4148 diode is enough to protect it at the relay

Relay 12v 7A dc

@@CreativeTechos ok and excellent

Thanks 😊