Developed by the SEIA Quality Assurance Working Group, this document was designed to update installation best practices originally developed by the Solar Access to Public Capital (SAPC) working group organized by the National Renewable Energy Laboratory, and is intended to be updated as proper protocol dictates. The primary intention of this document is to provide recommended best practices to facilitate high-quality and consistent residential solar projects. The broader objective in developing and maintaining this document is to build confidence among potential solar customers, regulators, investors, rating agencies, and other stakeholders in the concept that residential solar systems are a valuable home improvement, a consistent and long-term electric generating resource, and credit-worthy investment asset class.