Bro the article headline even says balcony railings. We’re talking single solar panel + plug in micro inverter type setups. That’s like $200 if you shop around.
And not sure if you’re aware, but after the “usable age” the system produces at like 80% capacity, so unless you disconnected from the grid and really really need that last 20%, you don’t need to change a thing and can keep using it way past the warranty period. Or you can add a couple extra panels. Why replace the whole thing lol.