Dust is the biggest factor
Hyderabad’s dry spells mean dust and pollen build up on panel surfaces faster than in wetter climates, and this directly reduces output. A gentle water rinse every 3–4 weeks during the dry months (roughly October to May) keeps generation close to its rated potential.
Monsoon season needs less, not more, cleaning
Regular rain during the monsoon does a reasonable job of naturally rinsing panels, so cleaning frequency can drop. What’s worth checking instead is drainage around the mounting structure and cable entry points, to avoid water pooling or seepage.
Watch for heat-related output dips
Panel efficiency drops slightly as panel surface temperature rises, which is normal in Hyderabad’s summer months. A small seasonal dip in generation during peak summer afternoons is expected and not a sign of a fault.
What a professional AMC covers
An annual maintenance contract typically includes scheduled cleaning, inverter health checks, cable and connector inspection, and generation monitoring — catching small issues (like a loose connector or an underperforming string) before they become bigger drops in output.