{"product_id":"renogy-core-12v-40a-dc-dc-on-board-battery-charger","title":"Renogy CORE 12V 40A DC-DC On-Board Battery Charger","description":"\u003ch2\u003eShort Product Summary\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eRenogy CORE 12V 40A DC-DC On-Board Battery Charger\u003c\/strong\u003e charges your auxiliary house battery from your vehicle's \u003cstrong\u003ealternator while you drive\u003c\/strong\u003e, with a correct multi-stage charge for lithium, AGM, gel and flooded batteries. It's the reliable way to keep your dual-battery system topped up on the move and protect your starter battery.\u003c\/p\u003e\n\u003ch2\u003eWhy This Product\u003c\/h2\u003e\n\u003cp\u003eModern smart alternators won't fully charge a lithium house battery directly. A DC-DC charger converts alternator power into a correct, full multi-stage charge — getting the most into your house bank on every drive while keeping your starter battery protected. At 40A it's a strong fit for mid-size dual-battery builds.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e40A DC-DC charging\u003c\/strong\u003e – fast alternator charging of your auxiliary battery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-stage charging\u003c\/strong\u003e – correct charge profile for a healthy battery.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery compatibility\u003c\/strong\u003e – lithium (LiFePO₄), AGM, gel and flooded.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtects your starter battery\u003c\/strong\u003e – isolates and prioritises correctly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart-alternator ready\u003c\/strong\u003e – charges house batteries modern alternators won't.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eIdeal For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaravan, trailer \u0026amp; 4x4 dual-battery builds\u003c\/strong\u003e charging on the move\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLithium house-battery upgrades\u003c\/strong\u003e behind a smart alternator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSetups charging mainly from the vehicle\u003c\/strong\u003e (add an MPPT model for solar)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eLocal Support from 4Matt Campers\u003c\/h2\u003e\n\u003cp\u003e4Matt Campers serves the \u003cstrong\u003eWestern Cape\u003c\/strong\u003e and \u003cstrong\u003eCape Town\u003c\/strong\u003e, and ships across South Africa — helping clients build reliable 12V and off-grid power systems. We'll help you wire the DC-DC charger correctly to your alternator and house battery.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Renogy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e CORE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e DC-DC on-board battery charger\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCharge Current:\u003c\/strong\u003e 40 A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Voltage:\u003c\/strong\u003e 12 V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput:\u003c\/strong\u003e Vehicle alternator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCharging:\u003c\/strong\u003e Multi-stage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery Types:\u003c\/strong\u003e Lithium (LiFePO₄), AGM, gel, flooded\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × Renogy CORE 12V 40A DC-DC Charger\u003c\/li\u003e\n\u003cli\u003eUser manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eOptional Fitment \/ Upgrade Notes\u003c\/h2\u003e\n\u003cp\u003eFor a correct install, it's worth confirming:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCable sizes from \u003cstrong\u003estarter battery to charger to house battery\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAn \u003cstrong\u003eignition \/ D+ trigger\u003c\/strong\u003e where required for smart alternators\u003c\/li\u003e\n\u003cli\u003eWhether you also want \u003cstrong\u003esolar charging\u003c\/strong\u003e (choose a 30A\/50A MPPT model)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eComplete Your Setup\u003c\/h2\u003e\n\u003cp\u003eBrowse the full \u003ca href=\"\/collections\/renogy\"\u003eRenogy range\u003c\/a\u003e and \u003ca href=\"\/collections\/electrical-accessories\"\u003e12V electrical \u0026amp; power\u003c\/a\u003e gear. Pair it with a \u003ca href=\"\/collections\/lithium-batteries\"\u003elithium battery\u003c\/a\u003e and a \u003ca href=\"\/collections\/solar-panels\"\u003esolar panel\u003c\/a\u003e for a complete charging system.\u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhy do I need a DC-DC charger?\u003c\/strong\u003e\u003cbr\u003eSmart alternators don't fully charge lithium house batteries directly. A DC-DC charger converts alternator power into a correct multi-stage charge, protecting your starter battery.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this one do solar?\u003c\/strong\u003e\u003cbr\u003eThis 40A model charges from the alternator. For built-in solar charging, choose a DC-DC charger with MPPT (our 30A or 50A models).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich battery types does it suit?\u003c\/strong\u003e\u003cbr\u003eLithium (LiFePO₄), AGM, gel and flooded — selectable to match your battery.\u003c\/p\u003e","brand":"Renogy","offers":[{"title":"Default Title","offer_id":47765568684217,"sku":null,"price":3675.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0764\/4587\/6409\/files\/12V_40A_DC_to_DC_Battery_Charger_1-8902794.jpg?v=1782288783","url":"https:\/\/www.4mattcampers.co.za\/products\/renogy-core-12v-40a-dc-dc-on-board-battery-charger","provider":"4Matt Campers","version":"1.0","type":"link"}