It is becoming more common to utilize solar cell modules with higher efficiency and higher output. The use of renewable energy not only secures power supply in remote islands and remote areas but also in general households and large-scale plants has various merits such as reduction of CO2 emission and cost reduction of electricity cost.

In countries and facilities where power supply is unstable, a combination of commercial power supply and photovoltaic power generation and a battery storage that retains the electric power and enables the construction of various infrastructures and computer networks by supplying more stable power. Furthermore, even in Japan, securing stable electricity at all times in preparation for a disaster is a very important task.