Because the voltage of solar panels is designed, respectively is for 12 v and 24 v battery.
2. Of course, you can have multiple in series with the battery so the battery by solar panels can also combine to.
3. Solar panels are produced by dc, after filling into the battery, battery out of 12 v / 24 v voltage is certainly / 36 v this is the most commonly used several specifications of solar street light.
4. Solar street lamps light source on the market at present, is special designed to make solar panels, so the conventional voltage for the 12 v / 24 v / 36 / it is the mainstream, of course, there are higher, such as 48 v / 72 v, etc. The above content released by shandong solar street lamps factory finishing 】