I'm reviewing a 289kW PV design with three inverters outputting at 480V. The building's service is 208V, so a 500kVA transformer is being used. Two questions: 1) What should the wiring configuration be for the xfmr (Y-Y?). The solar designer has shown a neutral in both the primary and secondary circuits - is that typical? 2) Is inrush current a consideration on the primary side (the inverter output side)? On the secondary (utility) side?