•Senior design engineer preparing electrical design drawings for up to multi-megawatt grid-tied & stand-alone photovoltaic (PV) systems using AutoCAD. •On-Site electrical system surveys for PV interconnection and feasibility.•Power Relay circuit protection design and programming typical for PV system utility network protection requirements. RTU communication engineering.•Technical bid specifications RFB. Bid specifications are crafted for high performance at minimum costs.• Owner’s engineer for bid evaluation, design and submittal review, project management and oversight.• Inspects grid-tied commercial and residential PV systems in MA, CT, & NY. Writes detailed reports on National Electrical Code (NEC) compliance and system performance.•For-Construction photovoltaic design drawings (P.E. stamped) of Mega-Watt scale PV systems for performance and NEC/bid specification compliance. This work is followed by site visits for system performance verification testing.•Economic and Production Analysis for optimization of typical and constrained PV Systems.