Summation of Supplies – Why This Is the Defect Nobody Told You About
Pat SouthwellPublished on: 02/09/2026
Summation of supplies is one of the most misunderstood topics in modern solar and battery installations—and Pat Southwell admits it wasn't something he immediately understood either. In this honest and practical breakdown, he explains why it's becoming a major compliance issue, the simple four-step process he now uses on every job, and the key mistake that leads to most defects.
Compliance & Standards
