Special multiple windings design of the transformer enables to connect multiple inverters to the grid with minor number of transformers in total. We use CAD tools for designing of Electrical Transformers. We design as per IS & IEC standards. By the software usage we can predict how the transformer will behave under electromechanical stresses, short circuits and overloads. The designs are so chosen that the total cost including material, maintenance and the energy cost due to no load and load losses are economic.