Topic: Battery-based Solar Electric System Design Energy storage has been a part of many PV systems since the beginning, but now the market is growing like never before. In this class the focus is on the fundamentals of battery-based PV systems. The applications and configurations are many, and their complexity far exceeds that of grid-direct PV systems. Components such as batteries, charge controllers and battery-based inverters are discussed. Load analysis is critical to system design and will also be addressed, along with other design criteria.