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MPPT Solar Charger

Like my ultrasonic anemometer project, this is something a bit more involved. So there will be a series of posts. This page serves as a directory for all my posts about my MPPT solar charger. More will definitely be comming up…

Posts
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  1. Concept and hardware: /posts/arduino-mppt-solar-charger-shield/
  2. Hardware testing: /posts/arduino-mppt-solar-charger-shield-testing/
  3. A closer look at the software: /posts/arduino-mppt-solar-charger-shield-software/
  4. A new, very low power, standalone design: /posts/mppt-solar-charger-design/
  5. First tests with the standalone design: /posts/mppt-solar-charger-testing/
  6. User interface: /posts/low-power-user-interface/
  7. More testing: /posts/mppt-solar-charger-testing-ii/
  8. Introducing the  Rev C design: /posts/mppt-solar-charger-rev-c-design/
  9. Test results for Rev C:  /posts/mppt-solar-charger-rev-c-first-test-results/
  10. Mechanical design and a few words on Revsion D: /posts/mppt-solar-charger-update/
  11. Revision F board: /posts/mppt-solar-charger-revision-f/
  12. Hackaday prize: /posts/solar-charger-in-hackaday-prize-finals/
  13. Bootloader ready: /posts/usb-mass-storage-device-bootloader/

Github
#

Github has become the way I share both hardware designs as well as code. So whenever you’re looking for something, chances are high that it’s on github.

These are the repos relevant to this project:

20160203_Projekte_005

Downloads
#

Since I’ve moved (almost) all my stuff to github, these are largely outdated:

  • Schematic, board layout and eagle files: SolarCharger_Rev1.zip (file no longer available)
  • Arduino Sketch: solarpanel.zip (file no longer available)
  • Eagle files including PDFs of the standalone solar charger: SolarCharger_Rev2 (file no longer available)
  • Very basic software for the standalone solar charger: SolarChargerRevB_Code (file no longer available).

 Inductance Meter

16 Comments

koen weijand 1 May 2016
almost done with the high voltage MPPT charger schematic. if you send me a mail I can send you an eagle schematic koen(at) weijand.nl
Abdul Rasheed 31 March 2017

Hi, I am working in dubai, as SCADA hardware supervisor, i need to make solar MPPT charger for my home, i read your article, can help me.

regards

Abdulrasheed

seyed ali 11 December 2017
hello Mr lucas Im Seyed Ali Fattahzadeh .Im electronic power engineer .if you have heard the news,an earthquake happened in iran kermanshah city and alot of people died and suffered .im planning to help them and make around 30 mppt solar chargers even more for those who live tamporary in tents for free.you know we have to take care of each other because we are humans, i want to make your first version that is much simple.can you help me for this charity action? believe me they are living in a bad condition and hopeless atmosphere. thanks a lot and god bless.
Marius Hauki 17 July 2018

Hi. I am interested in buying one populated solar charger compatible with latest fw revision.

Marius Hauki Dambraatan 9 3510 Sylling Norway

Jason Morris 12 August 2018
Hi I am trying to make your awesome mppt charge controller. On the userinterface pcb I wanted to know what value digtal pot is used 10k or 100k. Thanks
Daniel 6 October 2018

Sollte es irgendwann ein Kit aller Teile des MPTT-Tracking-Charges zu kaufen zu geben: Ich würde es sofort kaufen :)

Vielen Dank und liebe Grüße in die Schweiz,

Daniel

Hans-Joachim 24 October 2018

Hallo Lukas,

wir entwickeln Solarlampen und interessieren uns sehr für Deine Solar-Charge-MPPT-Controller.

Kann man ihn bei Die kaufen?

Und wenn ja, dann zu welchem Preis und zu welchen Lieferzeiten? Gruß Joachim

Hans-Joachim 24 October 2018

Hallo Lukas,

wir entwickeln Solarlampen und interessieren uns sehr für Deine Solar-Charge-MPPT-Controller.

Kann man ihn bei Die kaufen?

Und wenn ja, dann zu welchem Preis und zu welchen Lieferzeiten? Gruß Joachim

saagar 5 January 2019
Hi, You have done Awesome project. I saw many MPPT solar charger but this one is really nicely done. i am very much interested to have one.
Lima 11 February 2019
Please what working voltage and current can the MPPT you design handle. I want to make it as project
Franceen Vince San Andres 15 July 2019
I stumbled upon your post while searching for an MPPT Solar Charge Controller and I find your work intricate and well detailed. However, as a fellow enthusiast, I am nothing but a novice in this matters. So I would like to request for your extended assistance while I am constructing my project almost similar to yours. I am planning to use a 100W Solar Panel. Please I need your help. Hoping for your positive response in this matter. Thankyou!
Martín Viggiano 24 August 2019
Hi Lukas, I am going to develop a MPPT solar charge controller as my final project of my electrical engineering degree. I have gone through all of your posts where you talk a lot about the hardware. I have that part of my project completed. I tried to read your code but it was difficoult for me because I could not find any documentation. If it existed, would you mind sending it to me? If it didn’t, would you mind explaining your code structure a bit? I am not familiar with the “OS” programming paradigm. Thank you very much, your experience will be of great value for me.
Erik Erhard 25 August 2019

Hi Lukas, I´m a 23 year old electrophile paramedic trying to dig myself into electronics and the digital world. i just stumbled across your MPPT-Solar Charger as i realized it might be a quit advanced start into microcontrolling for an Hobbyist who paused his urge in this direction at 18 with limited knowledge as function of single components like Transistors, Thyristors ect. Do you have any tips for a noob like me who´d like to leave simple things as power supplies, light barriers and so on behind. May you recommend a book on microcontrolling (especially arduino)? As a wannabe bioanalytic (never made it further then the 4th Semester) i´m dreaming of a solar powered sensor station and your project for the hackaday prize was just so impressing… i thought myself: i just have to drop him some lines… I still haven´t had time to read the full article but i surely visit your block more frequent in future. Last question for this nightshift… Fässler sounds german, hab ich recht?

I´m looking forward for your reply. Many greetings from Under Franconia Erik

Peter Putnam 20 December 2019

Lukas,

I’ve struggled to find any user instructions for your MPPT solar charge controller on your git-hub pages. A simple question if I may…

Consider a vehicle with a single alternator charging two batteries with a 2-diode battery isolator. With the engine not running and the charger connected to the junction of the alternator output and the two diode anodes, there will be no measurable current until the voltage reaches the battery voltage plus one diode-drop.

Will the charge cycle start properly if the controller doesn’t “see” a battery initially?

Thanks, Peter

Warren Gacho 14 October 2020

Hi Lukas. I’ve been planning to build a Tig welder pulsing function to weld aluminum. Is the MPPT charger same with the principle of welding?

Thanks and regards.

Una Wang 18 December 2020

Hi Lukas,

I am a master student at ethz that is doing a thesis on building a stand-alone, solar-powered, smart-contract-operated meditation shed. I am doing the project under the supervisor Jens, who you will find on above website.

Your MPPT solar system looks awesome and is exactly what i need in the system. Its great that it seems you are located in ZUG! Are you selling your MPPT module yet? Additionally, if you are interested in the project, maybe you could involve in some other way too.

Looking forward to your reply!!!

Best Regards, Una


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