How your system is performing, what the weather is doing, and whether cleaning or an inspection may be useful. Every figure says where it comes from.
Specific yield (kWh per kWp per year) is the fair way to compare systems of different sizes.
The area average is published from real, anonymised systems in your governorate. Solink never fills it with a plausible-looking figure, because it changes how you read your own performance.
It separates three very different explanations for a drop in output.
Nearby systems dropped too, so something affected the whole area: dust, cloud, or a grid event.
The drop matches the weather over the period and nearby systems moved the same way.
Nearby systems held steady while yours fell. That points at your own installation and is worth inspecting.
Without it, a quiet week is ambiguous: you cannot tell a dusty month across Thailand from a problem on your own roof. That is why the page exists even before the data does.
Solink stores only an area, a period, a system count and an average yield for this. It keeps no household’s own readings in the comparison.