Sunrun Inc (Sunrun) is a provider of residential solar to residential homeowners. The company designs, develops, installs, finances, insures, monitors, and maintains the solar energy systems on a homeowner's roof. Sunrun also offers battery storage along with solar energy systems and sells services to commercial developers through multi-family and new homes offerings. The company offers core solar service through lease and power purchase agreements.

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Sunrun invests in R&D to drive the ongoing electrification of the US economy and maintain its market leadership through distinct operational tools. The company focuses on developing proprietary technology platforms, such as in-house pricing and real-time data software, to optimize tailored product designs based on specific home layouts, shading constraints, and electricity usage data. Also, the company provides a scalable, open-source platform to independent installers and distributors to maximize vertically integrated margins. Its R&D efforts also support the growth of its intellectual property portfolio. The R&D unit of Sunrun is responsible for developing proprietary technology platforms and expanding the company's intellectual property portfolio. This unit focuses on creating in-house software for pricing and real-time data analysis, as well as providing open-source platforms to partners. As of December 31, 2025, Sunrun Inc held 64 issued patents and 12 filed patent applications in the US. In FY2025, the company incurred an expense of US$36.1 million on its R&D, which is 1.2% of total revenue.