Solar energy storage includes systems that capture and retain energy generated from solar photovoltaic (PV) panels for later use, enhancing grid reliability and efficiency. Sometimes two is better than one. Coupling solar energy and storage technologies is one such case. As far as renewable energy is concerned, storing surplus power allows the lights to stay on when the sun goes down or the wind stops blowing. Topics in this guide include factors to consider when designing a solar+storage system, sizing a battery system, and safety and environmental considerations, as well as how to valu and finance solar+storage. The guide is organized aro nd 12 topic area questions. The system usually consists of photovoltaic modules, energy storage battery modules, power electronic converters (inverters), and. . Solar energy storage is crucial for maximizing the benefits of solar power.