{"product_id":"dc-extension-cable-mc4-3m","title":"DC Extension Cable MC4 — 3m","description":"\u003cp\u003eThree 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.\u003c\/p\u003e\n\n\u003ch3\u003eWhat three metres is really for\u003c\/h3\u003e\n\u003cp\u003eOnce 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.\u003c\/p\u003e\n\n\u003ch3\u003eVoltage drop, briefly\u003c\/h3\u003e\n\u003cp\u003eAt 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.\u003c\/p\u003e\n\n\u003ch3\u003ePractical notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSupport at regular intervals rather than letting a long span hang between two points\u003c\/li\u003e\n  \u003cli\u003eKeep the pair running together to minimise loop area\u003c\/li\u003e\n  \u003cli\u003eWhere 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\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eAlso available in 1m, 2m and 4m.\u003c\/p\u003e","brand":"APsystems","offers":[{"title":"Default Title","offer_id":43465676849200,"sku":"APS-DCEXT-3M","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0698\/3391\/6464\/files\/DC_Extension_Cable_a4993e15-42f0-47a0-9382-4e1b0c0c9c90.jpg?v=1786088634","url":"https:\/\/www.inchargesolar.com\/products\/dc-extension-cable-mc4-3m","provider":"InCharge Solar","version":"1.0","type":"link"}