Solar PV module wires are rated based on their maximum amperage capacity. Basically, a solar panel with a higher amperage (current) requires a thicker (larger diameter) solar wire with a higher rating. Be sure to check the system's amperage rating and use wires that can handle the load. For example, if it produces 9 amps of current, use 9 amps of wire or a little higher (10 or 11 amps).
Choosing a low rated solar panel wire will cause the voltage to drop. Over time, it can lead to overheating and even increase the risk of fire.
The thickness of asolar cable wire usually corresponds to its amperage. The thicker the wire; the higher the capacity of amperes. As a rule of thumb, always use wires thick or slightly thick enough to handle the occasional power surge. Determine the appliance with the highest amperage and choose a wire that can handle this current. To better guide you, use the wire size estimator available online.
Use the American Wire Gauge (AWG) to determine the size of the solar photovoltaic module copper Wire. In AWG systems, the wires become smaller as the AWG number increases. As a result, a 2AWG solar wire has a larger diameter than a 12AWG solar wire.
However, the wire size in a solar panel is inversely proportional to the amperage capacity of the wire. For example, a 2 AWG solar cable has a capacity of 95 amps, while a 12 AWG solar cable has a capacity of 20 amps. When choosing a solar panel wire, be sure to pay attention to its voltage.