The solar transformer structure is the same as an ordinary transformer’s general structure, including machine enclosure, winding, and steel core. The transformer must have separate windings to accept completely different inputs. Design issues also stem from the long-distance cable running to convert from DC to AC.
The inverter size restrictions also limit the size of the PV system. Increasing in size by adding more solar inverters to a transformer tank is extremely difficult. With the required box size and running cabling to convert DC to AC, things get complicated.