Using Low Voltage Wire For Solar Panels

You need to understand how different stringing configurations impact the voltage current and power of a solar array.

Using low voltage wire for solar panels.

Some exceptions may apply based on panel type. When solar panels are wired in series the voltage of the panels adds together but the amperage remains the same. Simply touch the solar panel leads with the multi meter probes matching their corresponding polarity red to red black to black. Follow that line across to the right to find your wire length in feet from solar to batteries.

Below is a chart showing the required wire size for wire lengths to connect the solar panels to the charge controller. This is starting to get lengthy so add a 35 safety margin which is. With stranded wire you get more intimate contact thus reducing. Therefore you would need 10 amp wire.

In this case it shouldn t be much of a problem as the power demand is low. The top row represents the wire gauge size the left column the number of amps the solar panels are rated at and the grid cells show the distances in feet between the solar panels and the charge controller. No quick and easy way to do it. You can place a solar panel where it gets light for power and run the cable to the fixtures.

Know the maximum expected current and size the wire then check against a v drop calculator over the distance to see how much you suffer. Wire size tables for low voltage find wire size required for less than 5 power loss read down the left hand edge to the number showing solar amps or watts your wire will carry for off grid power. Let s say your solar panels battery bank produced 7 amps and you were using a wire length of 4 6m. My preference is to use stranded wire in a low voltage system.

So if you connect two solar panels with a rated voltage of 40 volts and a rated amperage of 5 amps in series the voltage of the series would be 80 volts while the amperage would remain at 5 amps. Sorry for the late response was at scout camp the last week. 4 awg will handle 90 amps and at 24 volts that s more than 2000 watts. With solid wire you can not get the intimate contact between two wires nor at the connections on a device switch etc or load.

Solar panel wiring aka stringing and how to string solar panels together is a fundamental topic for any solar installer. It is somewhat like low voltage lights without having to have a need for a 110 volt power source.