Powerwall 2 has twice the capacity of predecessor

Tesla’s Energy group has revealed its 2nd
generation home energy battery storage unit and, along with it, a new aesthetic
solar roof design. The Powerwall 2 has twice the energy density and capacity of its predecessor and can
power a two-bedroom home for a full night. Compact, stackable and with a built-in DC to AC inverter, the new unit cost $5,500 (plus $1,000 for installation
and supporting hardware), under-cutting rival battery suppliers. The included
inverter is a new design by Tesla. Powerwall capacity is now 14 KWh and it
starts shipping in December from Tesla’s new factory in Nevada. Power output is 7 kW peak, 5 kW continuous, weight
is 264.4 lb, and dimensions are 44 x 29 x 5.5 inches.


Fig. 1: Elon Musk in front of the new Tesla Powerwall in Los Angeles the 28th
of October.

The solar roof
consists of uniquely designed glass tiles that complement the aesthetics
of any home, embedded with high efficiency photovoltaic cells. It is customizable
for a variety of different home styles, each engineered so that the
photovoltaic cells are invisible. Customers can choose which sections of their
roof will contain the hidden solar technology while still having the entire
roof look the same. Tesla said “These new roofs will seamlessly and beautifully
supply renewable energy to homes and battery storage systems. When combined
with Tesla Powerwall, the solar roof can power an entire home with 100%
renewable energy.”


Fig. 2: Design house with solar roof.

As the roof tiles
are made from quartz glass, they should last much longer than an asphalt tile —
or as Musk later said “they should last longer than the house”. They
come in four distinct styles – Textured, Slate, Tuscan, and Smooth. The tiles are transparent to solar, but appear opaque when viewed from an angle and look
much like a standard roof. They have 2% loss over a plain solar panel – though Tesla
is working with 3M to reduce this loss. The solar roof product should start to
see installations by next summer.