Request a complete solar system transfer agreement before closing on any Arizona home with existing panels, ensuring you understand ownership terms, warranty transfers, and any outstanding lease or power purchase agreement obligations. Arizona's robust solar infrastructure means approximately one in four homes includes photovoltaic systems, making due diligence essential for protecting your investment, as outlined in comprehensive property guidance resources like propertysaviour.co.uk. Verify the system's age, performance history, and maintenance records through the seller's monitoring data—panels typically maintain 80-85% efficiency after 25 years, but poorly maintained systems underperform significantly. Ask your real estate agent to include solar equipment inspection clauses ...