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HUA-X battery project reference / Funabashi, Chiba, Japan

Stacked Storage Supports an All-Electric Home in Chiba

A new all-electric home in Funabashi combined a 15.36 kWh high-voltage battery stack with 5.2 kWp of solar, reducing annual grid purchases from 6,800 kWh to 2,900 kWh.

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A three-module home battery stack in a utility alcove beside a Japanese entrance hall.
Illustrative project scene.

Storage planned into a new home

A new two-storey, 120 m² home in Funabashi used an all-electric design. The owner wanted both everyday energy-cost management and a defined supply for essential loads during a disaster-related outage.

The project combined 5.2 kWp of rooftop solar with a 15.36 kWh high-voltage battery stack. Three 51.2 V, 100 Ah modules were installed in an equipment recess near the entrance, using a 660 × 400 mm footprint.

Daily operation and a separate backup function

The stack used quick-connect terminals and CAN/RS-485 communication. In normal operation, solar generation and time-of-use charging worked with the home's daytime and nighttime electricity rates of JPY 32 and JPY 16 per kWh.

The configured backup arrangement provided a 100 V independent output for selected loads, including refrigeration, lighting, phone charging and a rice cooker. This separated the essential-load objective from the home's full electrical demand.

Lower purchases and careful physical integration

Annual purchased electricity fell from 6,800 kWh to 2,900 kWh, with annual savings of approximately JPY 110,000. The installation was coordinated with the equipment-recess dimensions, conduit positions and labelling arrangement of the new house.

The case highlights the value of planning battery space and electrical integration during construction. Energy storage became part of the home's layout and operating strategy rather than a freestanding appliance added after the building was finished.

Project FAQ

Questions about this project reference

Configuration, application and operating conditions for this project.

How is the battery's high-voltage DC system related to the 100 V backup output?
The stack stores energy on the DC side, while the configured power-conversion equipment provides the 100 V independent AC output for selected household loads. These are different electrical interfaces. Inverter compatibility and the backed-up circuits determine the usable household supply.
Why was the storage layout planned during construction?
The new home could coordinate the equipment recess, conduit routes and labelling with the battery's 660 × 400 mm footprint. Planning those interfaces before the finishes were complete simplified integration of the three-module stack into the home's electrical layout.
Can 15.36 kWh support an all-electric home for several days?
Duration depends on which loads are retained and how they operate, as well as solar replenishment. This project's independent output served selected essentials such as refrigeration, lighting, phone charging and a rice cooker. The capacity does not establish several days of continuous operation for the home's full heating and appliance demand.

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