A 5 kW solar system costs $15,000-$25,000, while a 10 kW system averages $30,000-$50,000 before subsidies. Factors like panel efficiency and roof angle affect these costs. Homeowners installing batteries, such as a 10 kWh system for backup, add $8,000-$15,000 to the. NLR analyzes the total costs associated with installing photovoltaic (PV) systems for residential rooftop, commercial rooftop, and utility-scale ground-mount systems. This work has grown to include cost models for solar-plus-storage systems. NLR's PV cost benchmarking work uses a bottom-up. Each year, the U. Data source: IRENA (2025); Nemet (2009); Farmer and Lafond (2016) – Learn more about this data Note: Costs are expressed in constant 2024 US$ per watt. Global estimates are used before 2010; European market. This article outlines key cost drivers shaping the price of solar installations, helping you navigate the market with confidence. 50 per watt installed, making the technology more accessible than ever before.