The negative pole (usually marked with a "-") collects electrons, while the positive pole ("+") releases them into the circuit. Reverse the connections, and your system won't just underperform—it could damage inverters or batteries. Every solar panel consists of two layers, with the top layer (often made of silicon) being positively charged, while the bottom layer is negatively charged. If you connect the positive and negative terminals incorrectly, you'll face reduced efficiency, potential equipment damage, or even safety hazards. Let's break down the most reliable methods to identify. To differentiate the positive and negative poles of solar panel lines effectively, it is essential to identify specific characteristics of the wires and their colors, recognize the placement of terminals on the panel and controller, and understand the implications of connecting to a battery or. The article explains how to determine the positive and negative terminals of a solar panel, crucial for proper installation to avoid energy wastage. Methods include examining the diode and using a voltmeter to measure voltage.