Which Wire On A Solar Panel Is Positive

If this is an ungrounded system also compliant in some circumstances then neither wire should be white.

Which wire on a solar panel is positive. The other side is the negative. Just like a typical battery you may be familiar with solar panels have positive and negative terminals. The positive wire has a female mc4 connector and the negative wire has a male mc4 connector that snap together forming a connection suitable for outdoor environments. Red and black are acceptable colors to use.

When stringing in series the wire from the positive terminal of one solar panel is connected to the negative terminal of the next panel and so on. To measure across the solar panel terminals or wires put the red positive meter lead on one side and the black negative on the other. White for negative denotes this is a grounded system and the negative is grounded. At the other end of each wire is an mc4 connector designed to make wiring solar arrays much simpler and faster.

Grounding the positive is also nec compliant and would thus have a white wire carrying positive. The truth is that they are not any more dangerous than the main panelboard that you have installed in your property. The striped cathode of the diode will be pointing towards the positive side of the solar panel. When solar panels are wired in parallel the positive terminal from one panel is connected to the positive terminal of another panel and the negative terminals of the two panels are connected together.

A simple voltage reading will show you the polarity of a solar panel even when inside.