A multimeter and a solar power meter are primary instruments for effective evaluation. In this article, we will explore the use of digital multimeters in solar applications, highlight various Fluke. Solar energy is a critical component of sustainable power generation, and accurately assessing a panel's output is essential for maximizing efficiency and ensuring optimal system performance. As we. Measuring their power output helps identify underperforming units, diagnose wiring issues, and maximize ROI. Here's what you'll need: Let's break down the process into actionable steps: Switch your multimeter to DC voltage mode (marked as “V–”).