DC Extension Cable MC4 — 3m

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Overview

Why this product

Three metres of MC4 extension, for the runs that cross something — a walkway between ground-mount rows, a roof obstruction, a gap where a module could not be placed.

What three metres is really for

Once you are past two metres you are usually not extending to the next module; you are getting around an obstacle. A plumbing vent that forced a panel two positions over. A ground-mount row split by a service path. A roof plane change where the inverter had to stay on the accessible side. These are the runs that were not on the layout drawing and only became apparent once the racking was up.

Voltage drop, briefly

At the currents a single PV module produces over three metres of properly sized PV wire, voltage drop is negligible — this is not a length where you need to start calculating. The thing actually worth watching as runs get longer is mechanical: more cable means more span to support, more exposure to wind movement, and more surface for UV over a twenty-five year life. Secure it properly and the electrical side takes care of itself.

Practical notes

Support at regular intervals rather than letting a long span hang between two points
Keep the pair running together to minimise loop area
Where cable crosses a walkway or service path, route it above head height or beneath the structure — not across the ground where it will be stepped on

Also available in 1m, 2m and 4m.