Japanese solar project developer Sun Village has announced the grid connection of a solar-plus-storage facility with a DC/AC oversizing ratio of 327% at an undisclosed location in Japan.

Described by the company as a “low-voltage, super-oversized” solar power plant with battery storage, the facility features 163.2 kW of installed PV capacity, a 253.3 kWh battery storage system and a 49.9 kW power conversion system (PCS).

In Japan, low-voltage solar projects typically have an AC output of less than 50 kW, while super-oversizing refers to installing PV capacity substantially above the rated output of the PCS. This configuration allows developers to increase electricity generation without expanding grid connection capacity.

Super-oversizing differs from conventional oversizing in its significantly higher ratio of installed PV capacity to inverter output, often exceeding 300%. By comparison, the average oversizing ratio for solar installations with capacities between 10 kW and 50 kW commissioned in Japan in 2024 was approximately 180.5%, according to the Ministry of Economy, Trade and Industry (METI).

“The plant is expected to sell approximately 222,000 kWh of electricity annually,” Sun Village said in a statement. “The DC-coupled configuration allows surplus electricity that would otherwise be curtailed during peak daytime production to be stored in the batteries and sold in the evening and at night, when solar generation declines.”

9 kW for approximately 14 hours. Under Japan’s feed-in premium (FIP) scheme , Sun Village will act as an aggregator, handling generation forecasts, power generation planning and battery operations, while selling electricity on the wholesale electricity market.

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