One real system — a 500 kW DC rooftop solar array paired with a 500 kWh / 250 kW battery system for a warehouse facility — carried through all 7 stages of design, from load profile to a finished code review.
7 steps. Steps 1-2 are free. Steps 3-7 unlock with a one-time $4.99 purchase.
The facility's actual interval usage data — annual energy and peak demand — that every sizing decision traces back to.
A 500 kW DC rooftop array sized against 100,000 sq ft of available roof area.
String vs. central architecture, DC/AC ratio, and hybrid vs. separate battery inverter design.
A 500 kWh / 250 kW BESS sized for peak demand shaving, with NFPA 855 siting requirements.
Supply-side vs. load-side connection per NEC 705.12 and the 120% rule.
Energy savings, demand charge reduction, ITC/MACRS, and payback/IRR for the combined system.
The final code-compliance pass across NEC 690, 706, 705, and NFPA 855.
Educational project reference. This project walks through a realistic scenario using the site's real calculators and written guides — it is a learning and reference resource, not a permit-ready construction document. Final system design, code compliance, and installation require a licensed engineer or contractor. See our full disclaimer.