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automatic solar garden light circuit schematic

Automatic Solar Garden Lights with LEDs

Efficient automatic solar garder lights circuit with minimum components the best deal is that is completely auto and the Solar panel acts as a light detector. Switches the Lamp off at Dawn, charges the battery during daytime and switches the LED lights ON at dusk providing 100 Lumens illumination during the night.

The solar panel must provide 5.5V and 150mA. Assuming a 3.7V/1500mAh battery the charging will be complete in 8 hours at 200% capacity @ 180 mA. With 10 LEDs the power consumption would be 90 mA/hour providing a 10 hours illumination with light levels of 50 lumens to 60 lumens. With 20 LEDs the light intensity will be 100 to 120 lumens.

You can use any number of LEDs and battery capacity too. This would directly provide you the amount of illumination and time for illumination. If you use higher capacity battery than that recommended the solar panel current should be increased proportionately. Current provided by solar panel should be 10% of battery capacity.

Solar garden lights circuit schematic

automatic solar garden light circuit schematic

automatic solar garden light pcb

Bill of material for the solar garden lights

  • Resistor (1) 4K7 or 5K6
  • Resistor (1) 47E or 56E or any value ( Current Limiting )
  • Transistor 2N3906
  • Diode  1N4001/7/ 1N4148 (Any)
  • Solar Panel 5.5v/200mA
  • Battery 3.7v/1500mAh
  • Switch SPST

103 Comments

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  • Dale

    I have a 5v, 250mA solar panel and want to use it to make an evening time light for my front door area, using 5mm white LED’s and a couple of 3000maH NiMH AA batteries. I like the idea of having 2 light levels, dim that normally runs and bright when someone approaches. And then the light turns off completely about midnight so light does not show through my bedroom window. How do I add motion detection to switch it to bright when there is movement nearby? How do I add an adjustable timer to turn it off after X hours? In winter X may be 6 hours and in summer as short as 2 hours. Also could the time delay turning on the LED’s until it is at least a half hour after sunset? I am just a hobbyist/tinkerer, but would love to build this instead of manually turning the porch light on and off every night. Thank you.

  • Ali

    Sir can u tell me how to make street light lamp of 16 v,18 ,24,36v circuit diagram

  • chanaka

    Dear Mr Sebastian

    i go through this web site and i want to build my own solar panel and solar charging unit.Mr colin Mitchel give various comment about your design.please help to solve this things and want to know the comments made by colin true or false??

  • chanaka

    can you give me the correct solar garden light circuit

  • chanaka

    Dear Mr Colin Mitchell,
    I go through the Circuit diagram and design data.i have no good knowledge about this theory and project.can you give me correct website links to study the area and i need to create solar panel and solar charging unit.

  • Colin Mitchell

    Here’s another person who could not get the circuit to work:

    Tacho on May 10, 2014 at 11:46 am
    reply
    Dear Sir,Thanks you so much for your circuit. Solar lamps are my hobby, and I’m not a professional of that (I’m a Scientist in Veterinary Research). I have built your circuit but I have found that the tension around the led is too low 2.7v, I have checked all the details and I can not find the mistake, may you help me?thanks a lot in advance regards tacho

    The circuit needs a voltage greater than 3.7 volts.

  • Colin Mitchell

    “i challenge him that the circuit given here is not only auccessful but excellent”

    zafer on April 4, 2014 at 3:28 pm
    reply
    its not working

    Colin Mitchell Colin Mitchell on March 5, 2013 at 5:03 am
    member
    reply

    He talks theory withoit trying the circuit

    RUBBISH:

    I built the circuit. It took 10.5mA.
    That’s 1.25mA per LED There’s no skill in delivering 1.25mA to a LED.

    Show me ONE PERSON who has got this circuit to work !!!!!!!!

    The circuit simply does not work.

    I advertised in Electronics Maker (Indian Magazine) (2 full pages each month) and did not get one reply or order from any hobbyist.

    Fortunately I got an Indian Professor BANNED from supplying junk projects to Electronics For You.

    Another Indian Professor said you can get 3.5v between base and emitter of a transistor.
    Luckily he has now closed his junk website.

    This SOLAR GARDEN LIGHT is another junk project.
    The author knows nothing about electronics:
    Look at this statement:
    “With 10 LEDs the power consumption would be 90 mA/hour ” ?????

    • chanaka

      Dear Mr Colin Mitchell,
      I go through the Circuit diagram and design data.i have no good knowledge about this theory and project.can you give me correct website links to study the area and i need to create solar panel and solar charging unit.

  • Sebastian

    Colin Mitchel has made it his business to berate other designers especially fro Asia.

    Raed and go to his websitw and you will be shocked by his rascost and racial abuse.

    He talks theory withoit trying the circuit and i challenge him that the circuit given here is not only auccessful but excellent due to its use of minimal componemts, that what is making his professorial pigheadness nit accept that you do not live by theory or can i compare him to the pharasies of old who thinj its his domain and a black man has no place

    Yes Indians with thier backwardness has sent satellites into orbit. It time all of us starr giving this abuser Mitchell Colin back

  • zafer

    its not working

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