Solar panel maintenance costs are often relatively low, because most systems have no moving parts, but prices vary by system size, location and the work required. Occasional professional inspections may cost around $150–$300, while cleaning can cost extra, particularly for steep or difficult-to-access roofs. Maintenance may include checking panels, mounting hardware, wiring, inverter performance and monitoring data for faults or reduced output. Ask a licensed solar electrician or reputable cleaning provider for a written quote, and check your system and inverter warranties before arranging work.