Off-Grid system is independent of the power grid. It has a battery bank to store excess electrical energy generated during day time and utilize this energy during night time when solar energy is not available. The Off-Grid or Stand-Alone PV System incorporates large amounts of battery storage to provide power for a certain number of days (and nights) in a row when the sun is not available. The array of solar panels must be large enough to power all energy needs at the site and recharge the batteries at the same time. Most Off-Grid systems benefit from the installation of more than one renewable energy generator and may include Wind and/or Hydro power.