Sharp's residential energy solutions feature greater overall power generation thanks to panel configurations geared to roof shape and a power conditioner, as well as a lithium-ion storagebattery that allows load levelling in which inexpensive night-time electricity is stored for use during the daytime.
Storage and battery life have both been doubled: The e-reader stores 4 gigabytes of books (enough for 3, 500 titles) and its battery can last a full month when wireless is turned off, or up to 10 days with its 3G connection turned on.