電力会社との契約不要、太陽光自家発電電気と商用電気の併用方法　　How to use solar self-generated electricity and commercial electricity together with no contract with the power company

添付した図が我が家での電気利用方法です。

太陽光で自家発電及び蓄電した電気を先ず優先的に100%利用するという意味で主電源としています。

この自家発電電気がゼロになると自動切替装置で商用（グリッド）電源に切り替わるので、後者が副電源となります。

太陽光による自家発電電源は自宅コンセントからの商用（グリッド）電源と自動切替装置に接続されますので電力会社との面倒な契約は不要です。

The attached diagram shows how we use electricity at home.

We use solar power generation and storage as the primary power source, which means that 100% of the electricity generated and stored by the solar power system is used first and foremost.

When the amount of electricity generated by the home-generated power reaches zero, it is automatically switched to the commercial (grid) power supply by an automatic switching device, so that the latter becomes the secondary power supply.

Since the solar-generated power is connected to the commercial (grid) power source from the home outlet and the automatic switching device, there is no need for a cumbersome contract with the power company.