How Can I Automatically Switch Between Dual Power Supplies at Home？

Many families will use dual power supplies. At this time, a simple device is needed to realize the automatic switching of the two power supplies.

For example, there are frequent power outages at home, so a set of backup power supply for batteries and inverters is prepared to switch between the mains and the mains. For the relays (contactors for high currents) available for users with small currents, connect them as shown in the figure below. When there is an incoming call, the relay is closed, and the electrical appliance uses the mains power to charge the battery at the same time. When the power is off, the relay is released and automatically switches to the inverter to supply power.

Another example is if install solar panels in the home. When there is sunlight during the day, solar power can be used to generate energy, and at night, it needs to use the grid electricity. It is also necessary to prepare relays for switching. If the solar panel needs to charge the electric car and the excess power is merged into the grid, the circuit needs to be planned in advance when connecting the circuit to avoid damage to the electrical appliance.

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