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The SLD — More Than a Drawing
A Single-Line Diagram (SLD) is the principal documentation of how a solar system is electrically configured. It is a legal document that must be completed by the CEC-accredited installer, kept by the system owner, and submitted to the DNSP with the grid connection application for commercial systems. In an electrical inspection, the inspector verifies the installation against the SLD.
What an Australian Solar SLD Must Show
Solar PV array: number of strings, panels per string, string VOC, string ISC, and panel model
DC array isolators: location, rating, and voltage rating
DC combiner box (if present): fuse ratings and string count
SPDs: location (DC side and AC side) and type (Type 1 or Type 2)
Inverter: make, model, CEC approval number, rated AC output
AC circuit: cable size, cable type, length, and circuit breaker rating
Switchboard: indication of solar circuit breaker, main switch, and earth connection
Metering: generation meter and/or bidirectional import/export meter
Solar isolation switch: location and label details
Battery storage (if present): battery type, voltage, capacity, and BMS model
SLD Software Tools
Most Australian solar design software generates SLDs as part of the design output. Common tools used by CEC installers include PVsell, Solar Surveyor, and SunSystems. The SLD must be site-specific — a generic template SLD is not acceptable for DNSP submission or CEC certification.
Engr. Jason Morales — Founder, SolarEnergyPH
