How to make electricity complement each other to maximize the effect of solar street lights

Mains complementary 18,683,666,161 solar street lighting is solar-based, supplemented by ordinary 220V AC lighting system, using this system, as the name suggests is that when solar energy can not meet the lighting requirements when the power supply automatically become common, this lights above the installation and tradition The street light installation is no difference, but part is not so simple poles plus light, it is two independent systems, which are different from the traditional has a separate solar lighting systems, there is an important component of solar panels batteries. Because there are common electricity as a secondary, so the solar panels can be designed to be smaller and the battery capacity, the basic day, sunny day, it is at the same time to charge the battery with solar power, the dark discharge of the battery when the load led lights lit, in in most parts of the year are basically more than two thirds of sunny weather, not only reduces the solar photovoltaic lighting system one-time investment, but also has a significant energy saving effect, when the only downside is installed but also on the road, "disembowel", then in the course of how we judge solar energy are not sufficient to drive the light source, it is the key to this problem. The battery terminal voltage test should be the most simple and effective way, the power source is constant, the battery discharge current is essentially constant, lead-acid battery, 12V system usually selected when the battery voltage drops below 11V, solar lights when it gets dark Solar power is transferred to the mains; if it is 24V system, the battery voltage is transferred to the mains when drops 22V.