This guide covers the fundamentals of solar panel wiring for licensed installers: how series, parallel, and hybrid configurations work, when each is the right call, how to build a permit-ready string diagram, what field installation practices trigger the most inspection. This guide covers the fundamentals of solar panel wiring for licensed installers: how series, parallel, and hybrid configurations work, when each is the right call, how to build a permit-ready string diagram, what field installation practices trigger the most inspection. Proper solar panel wiring is the foundation of any successful photovoltaic (PV) system. Whether you're planning a DIY installation or working with professionals, understanding how to wire solar panels correctly ensures optimal performance, safety, and compliance with electrical codes. Designed by our engineers and compliant with current standards in France, Belgium and Europe. Connecting a solar panel involves linking the panels together, then connecting them to a control box and the meter. There are several ways to connect the panels (series, parallel, mixed) and the choice depends. Connecting 20 solar panels can be accomplished effectively by understanding the necessary steps and configurations to ensure optimal efficiency and safety. Selecting the Right Configuration, 2.