Solar street lamps of high voltage switch

In solar street lamps light source, the most reliable should be traditional of 220 v ac ballast light source, this is because 220 v ac ballast technology to mature than low voltage dc electronic ballasts, 220 v ac electronic ballast's working current is small,

in the solar street lamps light source, the most reliable should be traditional of 220 v ac ballast light source, this is because 220 v ac ballast technology to mature than low voltage dc electronic ballasts, 220 v ac electronic ballast's working current is small, the semiconductor components of fever is small, its service life is longer than the low voltage dc electronic ballasts, therefore the high voltage ac source switching in figure 3 is the highest reliability, solar street lamps is recommended to requiring high reliability, the use of this system. Its disadvantage is that the existence of the inverter to reduce the efficiency of the system, the efficiency of the inverter is about 85%. In figure 3, the LED street lamp, paying special attention to the transformation of relay normally closed contacts and grid connection, and the electromagnetic relay coil must be powered by battery, this is due to the grid system is higher than the reliability of solar photovoltaic power generation systems, a high reliability system in can give priority to enter the state, once the solar photovoltaic power generation system malfunction due to continuous rainy day or other reasons, the utility will enter a reliable connection status.