This article by Guruiwatt has been answered. The voltage of European power grid is the same as that of Chinese mainland, with a low voltage of 230 V for single phase/400V for three phase and a frequency of 50Hz. The AC output voltage of medium-voltage grid-connected inverters in Europe is generally 480V V V. Unlike Chinese mainland, residential electricity consumption in Europe is much more expensive than industrial electricity consumption. The electricity consumption of Danish residents is about 2.32 yuan/kwh, that of German residents is about 2.25 yuan/kwh, that of Spanish, Portuguese and Italian residents is about 1.8 yuan/kwh, and that of Britain, Sweden, Switzerland, France and Norway is 1.5-65. If the proportion of distributed solar energy is high, the cost can be recovered in five years. The industrial electricity price is generally 60-80% of the residential electricity price.