This report was prepared as an account of work sponsored by an agency of the United States government. Department of Energy (DOE) Solar Energy Technologies Office (SETO) and its national laboratory partners analyze cost data for U. solar photovoltaic (PV) systems to develop cost benchmarks. These benchmarks help measure progress toward goals for reducing solar electricity costs. This report is available at no cost from the National Renewable Energy Laboratory (NREL) at www. Ramasamy, Vignesh, Jarett Zuboy, Michael Woodhouse, Eric O'Shaughnessy, David Feldman, Jal Desai, Andy Walker, Robert Margolis, and Paul Basore. Neither the United States Government, nor any agency thereof, nor any of their employees, nor any of their contractors, subcontractors, or their employees, make any warranty, express or implied, or assume any legal. The cost of a 30 kW energy storage system varies significantly based on several factors, including the technology type, battery chemistry, brand reputation, installation costs, and regional market conditions.