SolarCity offers off-grid, Tesla battery storage systems to Hawaii residents

California’s SolarCity, which has risen to become one of Hawaii’s top solar energy firms, is offering a more affordable battery storage system using a Tesla battery and an off-grid system to residential, business and government customers across the United States, including Hawaii, the company said Friday. With Hawaiian Electric Co.’s interconnection issues surrounding rooftop solar, this effort by SolarCity could lead to more companies, individuals and government entities to go solar. “In…