Apex Power Conditioning unit (PCU) is an integrated system consisting of a solar charge controller, inverter and a Grid charger. It provides the facility to charge the battery bank through either a Solar or Grid/DG set. The PCU continuously monitors the state of battery voltage, solar power output and the load. Once the batteries are charged to the preset level, the ApexGreen Solar Power Conditioning unit cuts off the Grid/DG Power from the system and Running/feeding the loads from the Solar Power+battery bank. After the battery gets discharged at certain level, the mains takes over charging as well as the load is fed through mains only. This way solar energy will be used first on priority and mains energy will be utilized only after the solar energy is fully exhausted.