Solar Panels:
Watts, efficiency, currents , voltage, Series and pararrell connection, handling and installation.

Inverter
Calculations of the right kva of inverter base on the load, inverter DC voltage, input voltage, pv voltage, charging current , pv minimum voltage and maximum voltage. series and pararrell connection, pv connection,

Batteries:
DC current ( HA) , vdc , series and pararrell connection.

Charge controller:
current rating, pv connection minimum and maximum, watts

Solar street light:
current. Batteries voltage, Lumen , watts, recommend poles height base on Lumen .