Testing solar panels after installation involves three primary methods: using a multimeter to measure voltage, current, and resistance; employing clamp meters for non-invasive current tracking; and utilizing solar charge controllers for real-time wattage monitoring. Regular testing ensures optimal. Quick Answer: Solar panels require three types of inspections: a mandatory final inspection for new installations before activation, annual DIY self-inspections, and professional inspections every two years. Key items to check include panel surface condition, electrical connections, mounting. With insights from top solar panels manufacturers, we'll walk you through four simple ways to check if your solar panels are working properly and how to keep your system delivering maximum energy output. How to Tell If Solar Panels Are Working? 1. System Uptime. Whether you're a homeowner checking your rooftop system or a solar technician ensuring functionality, understanding how to test solar panels can help detect issues early and improve efficiency. Begin with a visual inspection, focusing on the physical integrity of the panels, including signs of damage or debris.