I did install one last year. See https://shannontidytowns.blogspot.com/2023/06/we-now-have-solar-powered-light-in-our.html
And that blog has the installation details. This blog concentrates more on the design.
So I have used Scratch to draw a system diagram overlaying photos of the components.
1) Two 100W PV panels wired in parallel to give 20V @ 10A max. (So a 200Wp system)
2) An isolation switch to disconnect both PV cables from the charge controller (inside the container)
3) An Epever LS2024B charge controller. NOTE: external fuses for battery and PV have been added
4) A 12V lead acid car battery (Exide Excell RB442 44Ah @ 12v) So when 100% charge can supply 12v @ 1A for 22 hours before it reaches 50% charge.
5) A LED lamp. This is a white LED strip fitted behind the white diffusion layer of a flat TV screen.
6) A rocker switch to turn the LED lamp ON and OFF
And below is a more traditional system diagram :)
