{"product_id":"vevor-12v-140a-split-charge-relay-kit-dual-battery-isolator-ip65-marine-grade-with-full-install-kit","title":"VEVOR 12V 140A Split Charge Relay Kit — Dual Battery Isolator, IP65 Marine-Grade with Full Install Kit","description":"\u003cp\u003e\u003cstrong\u003eVEVOR's 12V 140A split charge relay kit is a voltage-sensitive dual battery isolator system that charges a starter and auxiliary battery simultaneously while preventing one battery from draining the other.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you run accessories from a secondary battery in a camper, boat, or 4x4, this kit provides an automatic way to share alternator charge without risking a flat starter battery. The relay monitors voltage and closes at 13.3V to allow charging, then opens at 12.8V to isolate batteries when charging falls below the threshold. Built for exterior and marine use, the relay is IP65-rated and packaged as a full-install kit with cables, terminals, fuses, and mounting hardware.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the relay decide when to connect my batteries?\u003c\/h3\u003e\n\n\u003cp\u003eThe VEVOR voltage sensitive relay uses preset voltage thresholds to manage battery connection automatically. When alternator output raises system voltage to 13.3V the relay closes to let the alternator charge both batteries; it reopens at 12.8V so the starter battery stays protected when the engine is off.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCut-in voltage: 13.3V — enables charging of both batteries\u003c\/li\u003e\n  \u003cli\u003eCut-out voltage: 12.8V — isolates batteries to preserve starter power\u003c\/li\u003e\n  \u003cli\u003eDelay time: 5 seconds — avoids toggling from brief voltage spikes\u003c\/li\u003e\n  \u003cli\u003eContinuous current capacity: 140A with 160A intermittent support\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat’s included and will I need extra parts?\u003c\/h3\u003e\n\n\u003cp\u003eThe kit arrives ready to install for most installations; VEVOR supplies the relay plus a comprehensive set of cables, terminals, fuses and mounting accessories so you typically won’t need additional components. You may only need vehicle-specific conduit or longer cable runs for remote battery locations.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOne voltage sensitive split charge relay (model JDQTJ-6M)\u003c\/li\u003e\n  \u003cli\u003eSix 1 mtr red 110A battery cables and black 1 mtr ground cable\u003c\/li\u003e\n  \u003cli\u003eMarine battery terminals, fuse holders, lug connectors, shrink tube\u003c\/li\u003e\n  \u003cli\u003eDrill bit, screws, split conduit and 15 cable ties for tidy routing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this relay durable enough for off-road or marine use?\u003c\/h3\u003e\n\n\u003cp\u003eYes — the relay housing is shockproof and dust-resistant, made from robust nylon plastic, with an IP65 waterproof rating to resist spray and dust. It’s suitable for vibration-heavy and outdoor installations like off-road vehicles, RVs and boats, although final placement and proper mounting are important to maximize longevity.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIP65 rating — protected against dust and low-pressure water jets\u003c\/li\u003e\n  \u003cli\u003eNylon plastic construction — impact and vibration resistant\u003c\/li\u003e\n  \u003cli\u003eStainless steel M6 power studs for corrosion resistance\u003c\/li\u003e\n  \u003cli\u003eLow standby draw of 8mA to minimize parasitic drain\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow much electrical load can it handle and what are the power characteristics?\u003c\/h3\u003e\n\n\u003cp\u003eThe relay is rated for continuous 140 amps with short intermittent capacity to 160 amps, which covers most alternator outputs for common camper and light-commercial setups. Electrical draws are low when idle and moderate during charging, so it’s efficient for long-term installations.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eContinuous current: 140A, intermittent: 160A\u003c\/li\u003e\n  \u003cli\u003eCharging current draw: 280mA during activation\u003c\/li\u003e\n  \u003cli\u003eStandby current draw: 8mA minimizing battery drain\u003c\/li\u003e\n  \u003cli\u003eCompact size (2.66\" x 2.11\" x 2.66\") for flexible mounting locations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: This VEVOR split charge relay kit is aimed at vanlifers, 4x4 and tow-vehicle owners, marine enthusiasts, and anyone who runs lights, fridges or winches from an auxiliary battery. If you want automatic charging control, reliable isolation to protect your starter battery, and a full accessory pack to simplify installation, this kit is designed to meet those needs without extensive additional parts.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this relay prevent my starter battery from being drained?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The relay isolates batteries at 12.8V, preventing auxiliary loads from discharging the starter battery when the engine is off.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can it handle my alternator output of 120A?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The relay supports 140A continuous current, which covers a 120A alternator safely.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"VEVOR","offers":[{"title":"Default Title","offer_id":55171880223063,"sku":"B0CY2C3NMZ","price":93.84,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/vevor-relay-front-view.jpg?v=1790449723","url":"https:\/\/britishgarage.co.uk\/products\/vevor-12v-140a-split-charge-relay-kit-dual-battery-isolator-ip65-marine-grade-with-full-install-kit","provider":"British Garage","version":"1.0","type":"link"}