With many options available, selecting high-quality panels can be challenging. This article outlines practical methods for assessing panel quality—appearance checks, label verification, and electrical measurements—to help you make informed decisions. Regular performance assessments through monitoring systems, 2. Visual inspection for physical damage, 3. The visible state of the panels, such as cracks, discoloration, or signs of corrosion, can be indicative of underlying issues that may affect their electricity generation. This versatile device can help you measure voltage, current, and resistance, providing insights into whether your panels are operating as they should. Testing requires a digital multimeter set to DC voltage mode to measure open circuit voltage (VOC) and DC amperage mode to check short circuit current (ISC).