Sunrun Inc (Sunrun) is a provider of residential solar to homeowners. The company designs, develops, installs, finances, insures, monitors, and maintains the solar energy systems on a homeowner's roof. It also offers BrightBox solar power generation with smart inverter technology and home battery storage. The company also offers services such as permitting, design approval, site inspection and utility interconnection for solar energy systems.

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Sunrun focuses its Research and Development (R&D) efforts on improving and expanding its platform of services and tools, which includes processes and design and proposal software, BrightPath. The R&D unit of Sunrun is responsible for managing the company's R&D activities, focusing on the improvement and expansion of its platform of services and tools, including BrightPath. In FY2024, the company spent US$39.3 million on R&D, which represented 2% of its total revenue and marked an 80.2% of increase YoY. The increase in R&D expenses was primarily due to an increase in headcount, leading to higher employee compensation costs, as well as an increase in support-related consulting costs. As of December 31, 2024, the company had 61 issued patents and 11 filed patent applications in the US.