Technical Guides

The electrical aspects of a photovoltaic installation require rigour and compliance with standards to ensure the safety of people and property. Sizing of protective devices, choice of cable cross-sections, and earthing are all crucial technical steps.

This sub-category includes all electrical technical guides: circuit breakers and AC/DC protection, cable cross-section calculation, single-line diagrams, earthing and lightning protection, compliance with NF C 15-100 standards and UTE C 15-712-1 guide.

The Definitive Guide to Circuit Breakers 2026. Our comprehensive reference (116 views) explains everything: circuit breaker ratings according to nominal circuit current, B/C/D curves and their applications (B for residential, C for inductive loads, D for motors), AC sizing (panel circuits → inverter → grid), and DC sizing (PV strings, batteries). Summary tables for 3kWp, 6kWp and 9kWp installations.

Cable cross-sections: essential calculations. The voltage drop must not exceed 3% in DC and 1% in AC. Formulas: Cross-section (mm²) = (2 × Length × Current) / (Conductivity × Permissible voltage drop). Examples: 10A string over 20m → minimum 4mm² copper. 100A battery-inverter connection over 1m → minimum 25mm².

You will also learn about earthing (equipotential bonding of panel frames, Type 2 lightning protection), regulatory signage (DC labels, emergency cut-off) and Consuel procedures for compliant commissioning.