The Distribution Board is a electricity supply system which divides the electrical power feed to the subsidiary Circuits.Which also has fuses,circuit Breakers associated with it and serves to each circuits. Recent Distribution boards contains Residual Current Devices(RCD) or Residual Current Breakers with Over Current Protection (RCBO) by GEESYS.ACDB consist of box of suitable powder coated metal casting. One feeder will be provided in ACDB with MCB of suitable capacity installed at feeder in the ACDB. Proper rating of MCB shall be installed to protect feeders from short circuit current (Isc) as per the requirements of the site. A separate change over switch of proper rating will also be suitably installed in the ACDB to isolate the existing connected load from solar system and cater the power to the existing load from the conventional power (grid) in case of emergency. ACDB should be connected between PCU and load. DCDB consist of Box of suitable powder coated metal casting. In this box, a separate arrangement which shall consist of MCCBs of suitable specifications & which can withstand respective flow of current, with the purpose of providing the option for isolating the battery bank & SPV arrays has been provided. There will be copper bus bars of suitable rating. Proper rating fuse & MCCB/Isolator for DC application will be suitably installed in DCDB as battery bank isolator.