The answer is no and it is because there is a floor on the return on investment for your own solar power. As a rule of thumb, a system that installs panels on your roof or on a stand and provides a large amount of Wattage hours is worth the money, but as in the video below, where the demonstrator uses it to power his computer and a few fans, those small equipment costs nearly as much as the larger equipment, such that in North America, where the power grid is ubiquitous, unlike India or on an RV (recreational vehicle) – desktop use is less than cost efficient.
To power your desktop with solar power you need components that aren’t as attractive, powerful nor as cheap the smaller scale you go. You need the panels, a controller, a battery (like a car battery) and an inverter to take the power in those batteries and transform them into AC power, like your wall socket. And these components do not drop in price as quickly as their size scales down.
Where the power grid is already gentrified, this is probably the smallest you would want a solar power installation to be,
Otherwise there is a new alternative. This device purportedly, because I haven’t tried it, can tell solar in the grid from other types of electricity and you can use that bit unlimited for a fixed rate of $20 a year (article).