You would need at least 4 gauge wire awg to move 18 amps 30 feet with a minimum voltage drop of 3 or less an acceptable loss.
Gauge of wire for small solar panel.
Follow this to the left until you see the one way length of wire you need in feet.
Enter the distance in feet from your solar panels to your battery bank charge controller.
Click on calculate to see the size wire required in awg american wire gauge.
Enter the total amps that your solar panels will produce all together.
Electrical wire which is the same exact thing as solar panel wire is categorized mainly based on it s conductor type.
Solar panel wiring size calculator this solar panel wiring size calculator lets you to work out the gauge of wire to safely take the solar dc power from a set of solar panels.
Besides this solar cable gauge calculator is designed to provide estimates for wire gauge size to determine your need for cables.
Use this to determine the right cable for your solar panels be safe and save money.
Commercial solar pv panels over 50 watts or so use 10 gauge awg wires.
Using the below charts find the current in amps on the left.
Igreely solar panel extension cable 10 feet 10awg 6mm solar extension cable with female and male connector solar panel adapter 10ft red 10ft black.
If you can t find the exact numbers choose either a larger gauge wire smaller number or select a distance longer than your actual distance.
These are the two basic wire types.
If multiple panels are combined in parallel then a three to eight awg combiner wire set is generally needed to safely transfer the power to a charge controller or gti.
Then look straight up to the wire size at the top.
Usually 12 24 or 48 volts.
Windynation 10 gauge 10 awg one pair 30 feet black 30 feet red solar panel extension cable wire solar connectors.
I will need 6 awg wire.
For example i want to run a 10 amp load wire 50 with 5 losses or less at 12 volt.
Enter solar panel output voltage.