It's been a week since Tesla unveiled its Powerwall battery system for homes and businesses. It's a 110-kilogramm flat battery pack in an aesthetic design that can be installed on a wall - indoors or outdoors.
Elon Musk - CEO and product architect of Tesla Motors - announced the Powerwall storage system at $3,000 for the 7 kilowatt hour (kWh) battery and $3,500 for the 10 kWh model [not including the installation costs].
The Powerwall does two things: It stores solar energy if you have solar panels and it stores energy from the grid when electricity is cheapest...