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# > 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.

Use this to determine the right cables for your solar panels, be safe and save money.

Values The output voltage of your solar panels
Maximum ampage produced by your solar panels as a set
Length measurement and wiring size using Metric?
Distance from solar panels to batteries or inverter
Acceptable wire losses

### Whats the difference between a cable and a wire?

People usually use these terms interchangably but a wire is a single conductor, whilst a cable can contain multiple seperate conductors. This is important as it can impact maximum current capability, a multiconductor cable will have a lower total power rating then distinct wires...

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• Planta Electrica said:

Why are voltages so low in solar panels?

ON Tue, 14 Feb 12, 3:57pm probably from Venezuela  Reply to this comment

• Tracy said:

Could someone please tell me if the online cable size calculator on EcoWho, automatically calculates the correct length of cable run, ie- 6mtrs panel to batteries,two cables, one positive one negative, total cable run 12mtrs, or if where lenghth is entered, it states, distance from panels to batteries, not cable run, being 6mtrs. I have a 12v 250w solar panel, 6 metres distance, 12mters in a 6mtr negetive and a 6mtr postive, I have purchase 4mm twin copper solar cable, which is only taking the distance, not the cable run. Have found info online through calculators,web pages with info and equations, and suppliers charts, and calculators all different answers.....from 4mm to 16mm2....help this is stressing me out. Don't want a fire hazard or a drop more than 3%. Thanks anyone from very confused.

ON Wed, 30 Dec 15, 6:12am probably from United States  Reply to this comment

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ON Fri, 29 Apr 22, 8:20am probably from Philippines  Reply to this comment