30W vertical solar led street light head is instaleld on 5 meters pole with 140W solar vertical module. The power of solar module is 140W 18V. This is a retrofit work . Solarylinder module was installed on ready poles where traditional street light were installed. Battery and controller are built inside of light fixture which makes the connection pretty easy. NO need to put the battery pack in ground or hang over the pole. Vertical solar led street light is a new concept since 2019. Auroras is the leader of vertical solar led street light in China.