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Basic Principles of a Solar Charge Controller for island or off-grid solar systems. Off-grid solar power systems provide electricity in places without mains power, like clubhouses or garden sheds, using a battery for storage. A charge controller with maximum power point tracking (MPPT) optimizes charging, and this article explains its basics, benefits, and design.

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>>>>>   The Arduino program can now be downloaded here !!  <<<<<
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          >>>>>       All three parts are published now !!        <<<<<

Part 1 deals with the basics, advantages and functionality of an MPP tracker. Part 2 converts the basics into a functioning circuit and explains how it works in detail. Part 3 covers the software and commissioning.
This project is not only interesting for those who want to build an MPP tracker, but also provides valuable suggestions for the design of power supply units or battery chargers. The software contains many routines that can be used in your own projects, such as a class for controlling the 4-line display that inherits the standard print method.

Find Part 1, Part 2 and Part 3 here
https://www.elektormagazine.de/magazine/elektor-426/63864
https://www.elektormagazine.de/magazine/elektor-430/63968
https://www.elektormagazine.de/magazine/elektor-446/64252
 
The production files for the PCB and the BOM as well as the software are here in this project available