The home battery version - called Powerwall - can be mounted to a wall or outside a home and is designed to provide power during peak evening hours or even allow the running of some home appliances for a few days in the event of a power outage. Available in 7- and 10-kWh models costing $3000 and $3500, respectively (not including inverter or installation), the Powerwall weighs 220 lb and measures about 3 ft x 4 ft x 7.1 inches deep.
The Powerwall can be stacked to up to nine units, for a total of up to 90 kWh. It is available for pre-order with expected shipping sometime this summer.
The industrial version - called the Powerpack - consists of 100-kWh blocks that can be scaled up to meet the needs of any commercial or utility-scale storage project. According to Musk, the company has already been approached by a utility interested in a 250-MWh installation. Meanwhile commercial business like Amazon and Target are already said to be in the process of rolling out pilot programs to test the Powerpack system.
At the end of his presentation, which had been held at a Tesla facility, Musk topped things off by announcing that the event had been powered entirely by Tesla batteries charged by solar panels on the roof of the building. See the full presentation in the video (18:02) below: