This is a battery-based system, and grid supply is not available basically this is used for remote areas or in which location where grid supply is not available as Backup supply during the night hours or rainy season. This is used for battery charging & load sharing during availability of the PV system & feed load through charged Battery during unavailability of the PV system refer below diagram.
Case 1
During the availability of PV/solar system Battery will charge with the parallel of power supply to loads as shown in the below diagram with the flow of energy power.
Case 2
During the unavailability of PV/solar system Battery will feed to loads as shown in the below diagram with the flow of energy power.
• The investment cost is High due to the use of Battery
• Not able to cuter the complete load during unavailable of PV system, generally Battery capacity design based on the Three (3) hours Backup as per IS/IEC standard. However, we can increase the backup time duration by increasing the capacity of the battery but it will impact the total investment cost.
• Grid supply not available as Backup in case of nonavailability of PV & Battery system
• Maintenance cost is high due to Battery
• Generation losses higher as compare to Grid-connected systems.
• Payback time is long will take time to return complete investment cost.
• Required additional space and closed room for battery storage
• The small scale used only