{"product_id":"kansmart-battery-isolator-relay-12v-500a-heavy-duty-solenoid-for-mobile-audio-marine","title":"KanSmart Battery Isolator Relay 12V 500A — Heavy-Duty Solenoid for Mobile Audio \u0026 Marine","description":"\u003cp\u003e\u003cstrong\u003eKanSmart 500 Amp Battery Isolator Relay is a heavy-duty 12V solenoid that safely isolates and controls a secondary battery bank for mobile audio, marine, and off-road systems.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you run extra electronics from a second battery — such as amplifiers, navigation gear, or auxiliary lighting — you need a robust way to let the alternator charge more than one battery while preventing the batteries from discharging into one another when the engine is off. The KanSmart 500A isolator relay offers continuous 500 amp handling with high surge tolerance, built from durable materials to withstand demanding environments. It’s designed for installations where reliable current transfer, minimal voltage loss, and long service life are essential.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this isolator protect my main battery when accessories are running?\u003c\/h3\u003e\n\u003cp\u003eThe relay disconnects the auxiliary battery from the primary battery when the system is off, so accessories cannot draw down your starter battery. When the alternator is charging, the isolator closes and allows current flow without the constant bleed-through that common passive isolators sometimes cause.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePrevents cross-draining between batteries when ignition is off\u003c\/li\u003e\n\u003cli\u003eEngages only during charging to preserve primary battery capacity\u003c\/li\u003e\n\u003cli\u003eReduces parasitic current that shortens battery lifespan\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this handle high current demands from powerful audio or winches?\u003c\/h3\u003e\n\u003cp\u003eYes — the KanSmart relay is built to carry continuous loads of up to 500 amps at 12V and tolerates higher surge currents for brief peaks. Its heavy-duty studs and internal contacts are sized to move large currents with minimal voltage drop, which helps your equipment get full available power when needed.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eContinuous 500A current rating for sustained loads\u003c\/li\u003e\n\u003cli\u003eRobust surge capacity to accommodate short bursts of extra draw\u003c\/li\u003e\n\u003cli\u003eLow-resistance contact design minimizes power loss under load\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow straightforward is installation and maintenance?\u003c\/h3\u003e\n\u003cp\u003eThe relay uses standard stud terminals and mounting points, so most installers can fit it using basic tools and appropriately sized battery cables. It’s constructed from corrosion-resistant materials for longer life in wet or salty environments, and it requires minimal servicing beyond occasional terminal inspection and tightening.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStandard 12V wiring with heavy-gauge cable to studs\u003c\/li\u003e\n\u003cli\u003eDurable housing suited for marine and off-road exposure\u003c\/li\u003e\n\u003cli\u003eSimple mounting and immediate operation after wiring\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat differences should I expect compared with diode or passive isolators?\u003c\/h3\u003e\n\u003cp\u003eUnlike diode-based isolators that introduce voltage drop or some passive isolators that allow minor bleed, this solenoid-style isolator connects batteries with very low loss when engaged. That means more efficient charging and better starting reliability, especially under high-current scenarios common in mobile audio and power-sports setups.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMinimal voltage drop during charge transfer\u003c\/li\u003e\n\u003cli\u003eMore efficient alternator charging of multiple batteries\u003c\/li\u003e\n\u003cli\u003eBetter performance with high-draw accessories and audio amplifiers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The KanSmart 500 Amp Battery Isolator Relay is designed for installers, vehicle owners, and enthusiasts who run demanding auxiliary systems — amplified sound systems, auxiliary lighting, winches, or navigation gear — and need reliable dual-battery management. It’s a good fit for boaters, off-road vehicles, RVs, and any mobile audio application where preserving the starter battery and ensuring efficient charging are priorities.\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: Can this isolator be used with a single alternator and two batteries?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It allows one alternator to charge both batteries while preventing them from discharging into each other when off.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What wire size should I use for 500A continuous load?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Use heavy-gauge battery cable (commonly 1\/0 AWG or equivalent) and follow vehicle and local wiring standards.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"KanSmart","offers":[{"title":"Default Title","offer_id":48083178094750,"sku":"B082HMDMLG","price":64.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/kansmart-500a-front-view.jpg?v=1785827856","url":"https:\/\/northtrailauto.ca\/products\/kansmart-battery-isolator-relay-12v-500a-heavy-duty-solenoid-for-mobile-audio-marine","provider":"North Trail Auto","version":"1.0","type":"link"}