Homemade modular Grid-Tie/On-Grid MPPT solar power inverter (no MCU, off the shelf parts)

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Grid-Tie/On-Grid solar power inverters are still extremely expensive and massively increase the investment into a solar system, even when built from used panels and inverters.
As such I have decided to develop my own option, that is as simple as possible and built from commonly available components (so no MCUs, its fully analog, and no transformer/coil winding).
To easily adapt to different sizes of solar systems, it is modular, with easily scalable peak power capability and number of separate solar strings.
This inverter simply takes all the power the solar array produces and pushes it into your grid. If your country doesn't allow outflow of energy (you delivering power to the outside grid) you will need some way to prevent that (variable dummy load, such as air/water heating or battery charging, that consumes any excess power and prevents outflow).

Chapters:
00:00 - Demonstration
02:21 - Operating principle
03:49 - 4Q rectifier circuit
05:07 - Power conversion module
05:44 - Single power module test
08:02 - Both power modules test
08:55 - PWM modulator module
09:23 - MPPT module
10:28 - MPPT adjustment
11:17 - Full power testing
12:04 - To be continued?
12:32 - To be continued!

Music:
Lost Years - The Score
Lost Years - At the Edge of Eternal Darkness
Lost Years - The Connection