One of the primary ways solar battery cabinets affect the payback period is through their ability to store excess solar energy. . For large home energy systems, solar power installation can take 3 to 6 months. Here is a simple breakdown: In. . These delays may be caused by a variety of things, from unexpected environmental barriers to supply chain interruptions and problems with permits. At Project Solar, our process usually takes about 1-4 months from deposit through installation. This means that timelines will also vary a bit, as some projects will require more steps than others. For solar companies, installers, and developers, minimizing these delays is key to reducing project costs, meeting customer. . While these administrative steps are a mandatory part of the solar installation process, they don't have to be a source of major delays.