Along with the modern people''''s living standards greatly improved also increased requirements for electrical life or other material, which means that the pressure of power will lead to weight gain year then generator overload is produced with power grid line overload pressure drop, and finally to the user there is no normal voltage especially now. If winter comes, the indoor temperature is low generally at home and some units will open air-conditioning or heating directly leads to a voltage drop, voltage to the lower end of the line, the general air conditioning voltage is not lower than 200V, if lower than this voltage if it leads to air conditioning does not work in this case is best not to use air conditioning to completely solve the problem, I suggest that the choice of voltage regulator, the voltage up to 220V after use.
Here I teach you how to choose your home network of regulators, this assumes that the lowest voltage in your home will not lower than 160V- no more than 250V under the highest I suggest that the choice of mechanical type AC voltage regulator. The regulator is better than the relay regulator price but in the use of the reliability and failure rate is far below the relay regulator. In the choice of capacity if low voltage load capacity to choose the best you 2 times as your ideal household regulator.