How To Tell Which Wire Is Positive Solar Panel

Only your volt meter will tell you the truth.

How to tell which wire is positive solar panel.

Actually there is a color code standard for dc pv systems and as the nec code book does not specify ac or dc the color code applies equally to both such systems. With parallel solar panels 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. 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. Connect this cable to the mc4 male adaptor.

When stringing panels in series each panel additional adds to the total voltage v of the string but the current i in the string remains the same. Wire solar panels in parallel by connecting the positive wire of the first solar panel to the positive terminal of the second panel and so on. Extend the output wires of the solar panel the positive wire of the solar panel is terminated with an mc4 female connector marked. Wiring solar panels in parallel causes the amperage to increase but the voltage remains the same.

Make sure that the locking tabs snap in for a firm connection. Another way to find the polarity of the solar panel is to check with a volt meter. Set the volt meter to read dc volts. 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.

The bare end of the positive extension wire will now be of positive polarity.