#142 Solar Power for the ESP8266, Arduino, etc. | Solar & Wind Products; View Hundreds of Solar & Wind Products Here!

#142 Solar Power for the ESP8266, Arduino, etc.

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In this video, I will start a project to use solar energy to power ESP8266 or Arduino devices during the whole year. We wll answer the following questions: 1.


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27 Comments on "#142 Solar Power for the ESP8266, Arduino, etc."

  1. One of the best explanation in the whole youtube. Giving easy explanations to easy concept is an uncommon skill. This is real engineering: i'm sure the beer helps! Greetings from Italy

  2. Guys i have found the following website where you can pull out CSV with the solar radiation per month from a satelite map.
    Hope it helps some of you :

  3. Johan PONIN says:

    Both very interesting and very useful and also very fun.

  4. Eman Retzun says:

    Thanks Andreas! Cell #2 is really quite good. Measured at 30 Ohm load 5.34V 182mA. Aug 29th / N53.8° / 45.5° sun. 👍 Would be nice to read what one could get near aquator 🤔

  5. Open Mind says:

    thx for the information keep it up

  6. Sven Pfister says:

    A Review of a full setup would be nice. E.g. OpenHAB2, MQTT, ESP32, Mongoose OS, powermanagement as well as solar and lipo setup. This would be interresting for building wireless sensor devices and integrate them into a free home automation system.

  7. huzaifa azam says:

    very informative, thanks for the video…..greetings from pakistan

  8. Andreas, just reviewed the Solar video again, great step by step clear instructions. I've worked though all the calculations and I'm looking forward to the next 'solar' video with the MPPT and battery charge regulator. Have I missed your second 'solar video or is it a 'work in progress' at the moment? Thank you for your time, effort and expertise

  9. MM says:

    Hey Andreas, your videos are always very informative, thank you.
    I'm looking forward to the MPPT test, I will use in my project a small solar panel ~5W and charge with it a single cell lifepo4 battery. With this setup a ESP8266 should be powered which uses deepsleep.

    Currently I'm testing this charger board, but I'm not very happy: http://ebay.eu/2whlRrV
    The CN3722 should be able to work with a input voltage between 7.5V and 28V… my idea was to use a 12V panel – but the charger board only works when input voltage is above 16V, I think this is because a fixed V-MPPT value is set to somewhere at 16V… there are boards available with a potentiometer, I think I will get one of these shortly.

    Greetings from Zurich

  10. Hi Andreas,
    Ich habe eine Schaltung entwickelt, womit der Arduino der Strom messen kann, den er selber verbraucht.

    In der Minusleitung der Stromversorgung wird ein Shunt (zum Beispiel 1 oder 10Ω) eingebaut, und man misst die Spannung an diesem Shunt.

    Das Problem ist dass, gesehen vom Arduino, diese Spannung negativ ist und der ADC mit negative Spannungen nichts anfangen kann.
    Man kann allerdings einen Trick anwenden: Gewöhnliche Silizium-Dioden fangen bei 0,5 – 0,6V V zu leiten.
    Mit dieser Schaltung wird die Spannung um den Shunt herum um 0,5 – 0,6 V Richtung Vin verschoben.


    Man braucht dann zwei Analogeingänge (am besten mit analogReference(INTERNAL) und der Strom ist proportional zu A0-A1.
    Man soll das Widerstand so klein wählen, dass der höchst zu erwarteten Strom ein Spannungsabfall von < 0,2 V verursacht.

  11. Hallo Andreas, kann man einen Step-Down Regler direkt an ein Solarpanel hängen um ein Smartphone zu laden? Oder braucht es da noch eine Diode?

    Gruss Stefan

  12. Hi thanks for the video.
    Yes designing a 24/24/365 solar powered system is quite different than to design a device to maximize solar harvesting during sunny days.
    Once you design it to gather enough power to pass bad winter days, you will discover that the panels will deliver > 500 times too much energy during hot sunny days.
    So one thing to consider is what to do with that energy?
    My current approach is to use that energy to power fans, that will cool down the whole system.

  13. Hello Andreas, just discovered your channel. How great it is that you are giving all this theoretical background before trying to build something. This is what more people should do. Good work, subscribed.

  14. Arturo Ribes says:

    Wow! Really good video, very nicely done. I can't wait to watch the next in the series, haha.

  15. souzamce says:

    Thank you so much Andreas. You are doing an amazing job. Your videos are simply perfect.

  16. Alex Goris says:

    +Andreas, thanks for this great video! One question: What is the 10% you mention at 11.25? Is that solar panel efficiency? Because earlier you were using 15% as the efficiency multiplier.
    Also, at ~3 minutes in the video you're making calculations based on the year-around solar radiation, but you take into account 15% efficiency for the solar panel, and then another 33% for the charging circuit. Then at end you make the same calculations again using the data for December instead of year-round, however here you only take 10% efficiency into account, so why 10 instead of 15, and what happened to the 33% of the charger circuit, I think we should still take it into account, right?

  17. Imaan Hameed says:

    Hello, Thank you for sharing your knowledge. The work that I am doing will likely implement LoRa and solar charging on an Arduino. Could you please continue this solar series, perhaps using Sparkfun's Sunny Buddy MPPT? Thank you.

  18. Thank you for this precise research! Really useful content! Could you please make any video about esp8266 (NodeMCU) with any small camera, if you have such experience, or may be with a new (A20 AI Thinker). Thank you!

  19. The calculation for Dubai might not be that accurate because solar panels lose efficiency with temperature, and it gets very hot over there. My friend has been using off-grid solar in Australia for decades because it would cost $250K to connect to the grid, and he notices that the batteries don't charge on very hot days.

  20. Darius J says:

    Many thanks for your reviews and tests!

  21. sviat88 says:

    If the device is outside, how to charge li-ion battery when the temperature is below zero ?

  22. Chrysippus says:

    This is my favorite video of yours to date. The fact that someone was kind enough to translate it to Portuguese also means I can scare my father (who thinks solar panels probably aren't much harder than connecting panel, battery and an LED lamp in parallel) all under the guise of a friendly 15min video.

    Not gonna lie I still don't get why MPPT is a $100 device instead of a little board that you buy in packs of 50.

  23. bryan ng says:

    Sir, since discover your channel, I like it very much and with your kind guidance, I learn a lot!!!! Thank you very much.

  24. loslelazlo says:

    Excelent Sir. Very clear!!!!.

  25. Alan Collins says:

    I agree with the positive comments. You are an excellent tutor. Thanks for your efforts.

  26. Great detail, appreciate the info. Yes, I agree with other comments, a well organised video. Thanks again Andreas.

  27. It was very useful, thank you. I am trying to accomplish the same with a pi zero, but found the power consumption to high. Looking at arduino next.

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