Japanese carmaker Nissan and power management company Eaton have unveiled a joint venture to provide wall-mountable lithium-ion batteries to power homes.
The new home battery system, called xStorage, will be in direct competition with Tesla's Powerwall lithium-ion wall-mounted battery, which the company announced last year.
Tesla's Powerwall will come in 6.4 kilowatt hour (kWh) and 10kWh capacities. The 6.4kWh battery retails for $3,000.
Recently, Tesla removed the 10kWh Powerwall battery from its website.
Nissan/Eaton's xStorage wall-mounted lithium-ion battery system will provide 4.2kWh of power and have a starting price of about $4,800, the companies said.
The xStorage lithium-ion home battery. Credit: Nissan, Eaton
While the xStorage battery appears to cost more than the Powerwall, Nissan said the total cost of ownership would be lower because the price includes professional installation of the unit. SolarCity is expected to charge about $7,500 for the Powerwall battery with installation, which includes an inverter that changes direct current from solar panels to usable alternating current.
Alex Eller, an energy analyst with Navigant Research, said the cost of the xStorage system -- if it can actually be fully installed for $4,800 -- would be one of the lower priced systems on the market.
"However the installed costs are generally measured in $/kWh," he wrote in an email reply to Computerworld. "A 4.2 kWh system installed for $4,800 is around $1,142/kWh. SolarCity claims they can install a PowerWall for around $7,500 for the unit rated at 7kWh [6.4kWh in actuality], which translates to only $1,071/kWh."
SolarCity spokesman Jonathan Bass, however, said the company offers battery storage as a service for $4,250, including the battery pack, advanced hybrid inverter, monitoring and control systems and warranty and 9-year service agreement."
"Installation is also included," Bass said.
Additionally, up to nine Powerwall battery units can be daisy-chained together on a wall to provide up to about 57kWh of power. Nissan and Eaton did not specify whether their batteries could be interconnected to provide more aggregate power.
The average U.S. household uses about 20kWh to 25kWh of power every day, according to GTM Research.
Eller said Nissan/Eaton have more to worry about than just Tesla and its battery system, saying "the marketplace for residential battery storage systems is growing highly competitive."
Currently, the residential energy storage market is small, concentrated in select parts of the U.S., Germany, Japan, and Australia, Eller said. It is, however, expected to grow very rapidly around the world.
"A big differentiator between these residential battery products is the sophistication of the energy management software system that operates them," Eller said. "Some of the higher end products have much more sophisticated software that’s capable of providing more services than the very basic systems on the market." "I would be interested to learn about the operating systems for Nissan/Eaton’s product, as well as their business model for selling it," Eller continued. "Will they be selling direct to consumers or targeting utilities?
Sign up for CIO Asia eNewsletters.