Rolling out in Japan, the O-Uchi Kyuden System provides a rated capacity of 8.7 kWh and a rated output of 5.5 kWh. It allows residents to save on electricity bills by storing energy during off-peak hours, and then using the stored charge when electricity rates peak. It can even be used to supply electricity during power outages.

Moreover, by linking it with roof-mounted solar cells, it can supply the appropriate amount of electricity based on customer needs day or night. Toyota believes that using this system will encourage the use of solar power.

Unique to this Toyota system is that the system supports supplying power from Toyota’s line of electrified vehicles—HEVs, PHEVs, BEVs, and even FCEVs. It can use electricity stored in these vehicles as a backup power source (maximum output of 1.1 kWh) during power outages too.

The system, meant to be installed outdoors, can be operated in a wide variety of temperatures from minus 20 degrees Celsius to 45 degrees Celsius.

It will go on sale in Japan through home builders and general construction companies.