DIY Mini Solar Charger & Home Made Charge Controller for small Battery Pack

Just finished this project. The circuit actually works. The charge controller circuit can be found here: www.mdpub.com/555Controller using a 555 Timer.

If the economic argument for MPPT doesn’t stack up, perhaps it’s ability to match high voltage panels to a 12V battery will. Here I connect two 20W panels in…


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  1. badphobar says:

    I think you only need the battery pack anti discharge diode as the
    transisters will already as as diodes.

  2. badphobar says:

    oh yah
    use 10 cells and works great.

  3. rey402 says:

    did You have the Diagram

  4. rex pogi says:

    also did this circuit but mine does this weird buzzing sound before

  5. Ermin0s says:

    Im also making this controller, my question is, do you have all the
    negative (ground) wires going to 1 place? and is the positive of you
    battery going to the positive of the 5 volt regulator and resistors?

  6. anthony christian Jaen says:

    also the diodes will also act like a resistor you used a smaller rectifier
    diode with that dc current … you need to add higher amp diode and it will
    also lower the voltage better use schotchky diode to minimize voltage step

  7. Carol Liep says:

    How to set up the low and high charging volts for a 6 volts lead acid
    batteries? For a 12 volts batteries the set up is 1.667 volts for low 11.9
    volts and 3.333 volts for high 14.9 volts,right?

  8. blahblah studios says:

    list the items

  9. anthony christian Jaen says:

    sebwano ka man dong? accent mo bisaya

  10. Rajat Sharma says:

    Sir can you share the electric components that you used esp what is the
    ‘blue stuff’ on your video to control voltage…. Sorry I am completely
    naive in electronics.

  11. Aungkyaw Soe says:

    i sent.

  12. Jacob Ellinger says:

    Would you be willing to help me with the list of parts I will need for a
    project similar to this?

  13. TheBudworth says:


  14. Paul J. Wilson says:


  15. Raymond Earle says:

    Excellent work sir.

  16. HWman says:

    Мне нравится Ваш британский акцент.

  17. joohop says:

    can i ask a favour julian ? just say i had 240v 1600rpm ac motor , now
    theres two questions i here what size inverter would i need to comforyably
    run it continuous ?

    second quedtion – how would you with wires cheaply control the 12v input
    from 0 to max slightly overbuilt ?

  18. Arne Larsen says:

    Nice work.
    But why are they in series?
    i always believed that series gets the voltage op, and parralel gets the
    watt op?

  19. Daniel Smith says:

    This series of videos is awesome…am trying to do something similar for my
    final year university project…but with automatic pwm adjustment/mppt

  20. Julian Ilett says:

    Solar Panel MPPT Test Rig #10 – 72 Cell Solar Panel charging 12V Battery

  21. Julian Ilett says:

    And I think it’s time to put current and voltage sensors on the battery
    side too, so both Watts in and Watts out can be measured. That will mean I
    can put an efficiency percentage on the display. It’s one thing to extract
    maximum power from the solar panel, but quite another to deliver it to the
    battery without losing too much energy as heat.

  22. James Wood says:

    What is the switching frequency? There seems to be a high pitched tone on
    this video.

  23. Julian Ilett says:

    15kHz, so you probably are hearing it.

  24. xanataph says:

    Looks like it’s coming along really well Julian.. 🙂 Do you think a brutal
    approach for the inductor might work – i,e. just wind it with heavier wire?
    Perhaps you could set up a line so you can send the power from those panels
    indoors so you can have them connected and use the scope too.

  25. Julian Ilett says:

    Cheers! I think the hot inductor and the ringing are connected, so
    hopefully it won’t be necessary to beef up the inductor too much. I’ve
    bought 10 inductors from China, 100uH, supposedly rated at 6A. My
    philosophy for this project will be easily available, low cost components,
    so I’ll have to make it work with them. My main problem is lack of
    sunshine, so I might put my 100W panel on the test rig and do some tests
    under overcast skies.

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