2. High-power electrical appliances should be rewired, and the wires should be connected to the power supply (main brake), which can solve some problems caused by voltage drop, especially for water supply pumps, induction cookers, air conditioners and refrigerators. It costs more, but it can solve your problem better.

3. Use a voltmeter to measure whether the voltage is stable. If it is unstable, it is a problem of the power grid, which is difficult to solve, which proves that there are many useful power users in your power grid.