{"product_id":"renogy-12v-40a-rbc40d1u-dc-dc-battery-to-battery-charger","title":"Renogy 12V 40A RBC40D1U DC-DC Battery To Battery Charger","description":"\u003cp\u003eKeep your leisure battery charged while driving with the Renogy 12V 40A DC to DC RBC40D1U Battery Charger, a powerful and efficient charging solution designed for camper vans, motorhomes, caravans, 4x4 vehicles and off-grid electrical systems.\u003c\/p\u003e\n\u003cp\u003ePart of Renogy's second-generation DCC range, this advanced 40A DC-DC battery charger safely converts power from your vehicle's alternator into a controlled charging supply for your leisure battery. Compatible with both traditional and modern smart alternators, including those found in Euro 6 vehicles, it offers a reliable way to recharge your battery whenever the engine is running.\u003c\/p\u003e\n\u003cp\u003eWith up to 94% charging efficiency, intelligent battery protection, lithium battery compatibility and optional Bluetooth monitoring, the Renogy 40A DC-DC charger is an excellent choice for modern camper van electrical installations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePowerful 40A Battery Charging – Delivers up to 40 amps of charging current to your 12V leisure battery, helping replenish battery capacity while driving.\u003c\/li\u003e\n\u003cli\u003eSmart Alternator Compatible – Works with both conventional and smart alternators, making it suitable for many modern Euro 6 camper vans and motorhomes.\u003c\/li\u003e\n\u003cli\u003eLithium \u0026amp; Lead-Acid Battery Compatibility – Supports LiFePO4 lithium batteries, AGM, Gel and flooded lead-acid batteries, with customisable charging settings.\u003c\/li\u003e\n\u003cli\u003eUp to 94% Charging Efficiency – Advanced DC-DC charging technology maximises energy efficiency and reduces power losses.\u003c\/li\u003e\n\u003cli\u003eAutomatic Alternator Detection – Intelligent engine-running detection helps protect your vehicle's starter battery from excessive discharge.\u003c\/li\u003e\n\u003cli\u003eOptional Bluetooth Monitoring – Connect a compatible Renogy BT-2 Bluetooth Module (sold separately) to monitor charging performance and adjust supported settings using the Renogy DC Home App.\u003c\/li\u003e\n\u003cli\u003eLithium Battery Activation – Supports the activation of compatible lithium batteries, with additional control available through the Renogy app when using the optional Bluetooth module.\u003c\/li\u003e\n\u003cli\u003eAdvanced Safety Protection – Built-in safeguards against reverse polarity, overvoltage, overcurrent, over-discharge and excessive temperature.\u003c\/li\u003e\n\u003cli\u003eIntelligent Temperature Management – Automatically reduces charging output when operating temperatures rise, helping protect internal components.\u003c\/li\u003e\n\u003cli\u003eBattery Temperature Sensor Included – Allows temperature-based charging adjustments for compatible lead-acid batteries.\u003c\/li\u003e\n\u003cli\u003eQuiet, Efficient Cooling – Natural heat dissipation provides effective cooling without relying on a noisy conventional cooling fan.\u003c\/li\u003e\n\u003cli\u003eCompact \u0026amp; Durable Construction – Space-saving design and corrosion-resistant housing make it suitable for camper vans, motorhomes and marine installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eEfficient Leisure Battery Charging While Driving\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOne of the most effective ways to keep your camper van leisure battery charged is by using your vehicle's alternator while driving.\u003c\/p\u003e\n\u003cp\u003eThe Renogy 12V 40A DC-DC Charger is installed between your vehicle's starter battery and leisure battery, converting the alternator's electrical output into a controlled charging supply.\u003c\/p\u003e\n\u003cp\u003eUnlike a traditional voltage sensitive relay (VSR), a DC-DC battery charger actively regulates the charging voltage and current, helping provide the correct charging profile for your leisure battery.\u003c\/p\u003e\n\u003cp\u003eThis is particularly important in modern vehicles fitted with smart alternators, where the alternator voltage can fluctuate depending on driving conditions and vehicle demands.\u003c\/p\u003e\n\u003cp\u003eWith up to 40A charging current available, the Renogy charger helps keep your leisure battery topped up, reducing your reliance on campsite electric hook-ups.\u003c\/p\u003e\n\u003cp\u003eCompatible with Lithium LiFePO4 \u0026amp; Lead-Acid Batteries\u003c\/p\u003e\n\u003cp\u003eThe Renogy 40A DC to DC Battery Charger supports a range of common 12V leisure battery technologies, making it suitable for both new installations and electrical system upgrades.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSupported battery types include:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eLithium Iron Phosphate (LiFePO4)\u003c\/li\u003e\n\u003cli\u003eAGM Lead-Acid Batteries\u003c\/li\u003e\n\u003cli\u003eGel Lead-Acid Batteries\u003c\/li\u003e\n\u003cli\u003eFlooded Lead-Acid Batteries\u003c\/li\u003e\n\u003cli\u003eCustom Battery Charging Profiles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIts intelligent charging system delivers controlled charging to suit the selected battery chemistry, helping maintain battery performance and longevity.\u003c\/p\u003e\n\u003cp\u003eFor compatible lithium batteries, the charger also supports lithium battery activation, which can assist with waking certain batteries from protection or sleep modes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSmart Bluetooth Monitoring with Renogy DC Home\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFor additional control and convenience, the charger features an RS485 communication interface compatible with the optional Renogy BT-2 Bluetooth Module.\u003c\/p\u003e\n\u003cp\u003eWhen connected to the Renogy DC Home App, you can access useful charging information directly from your smartphone or tablet.\u003c\/p\u003e\n\u003cp\u003eDepending on the available settings, you can:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor charging performance and operating status.\u003c\/li\u003e\n\u003cli\u003eView important charger information.\u003c\/li\u003e\n\u003cli\u003eAdjust supported charging parameters.\u003c\/li\u003e\n\u003cli\u003eManage lithium battery activation settings.\u003c\/li\u003e\n\u003cli\u003eCheck system status and operating information.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePlease Note: Bluetooth functionality requires a compatible Renogy BT-2 Bluetooth Module, which is sold separately.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdvanced Safety \u0026amp; Battery Protection\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Renogy 40A DC-DC charger incorporates multiple protection systems to ensure safe and reliable operation.\u003c\/p\u003e\n\u003cp\u003eThese include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReverse Polarity Protection\u003c\/li\u003e\n\u003cli\u003eOvervoltage Protection\u003c\/li\u003e\n\u003cli\u003eOvercurrent Protection\u003c\/li\u003e\n\u003cli\u003eOver-Discharge Protection\u003c\/li\u003e\n\u003cli\u003eOver-Temperature Protection\u003c\/li\u003e\n\u003cli\u003eIntelligent High-Temperature Power Reduction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThese integrated protections help safeguard the charger and connected batteries, making it a dependable addition to your camper van electrical system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: Renogy\u003c\/li\u003e\n\u003cli\u003eProduct: 12V 40A DC to DC Battery Charger\u003c\/li\u003e\n\u003cli\u003eModel \/ SKU: RBC40D1U-UK\u003c\/li\u003e\n\u003cli\u003eSystem Voltage: 12V to 12V\u003c\/li\u003e\n\u003cli\u003eMaximum Charging Current: 40A\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCharging Efficiency: Up to 94%\u003c\/li\u003e\n\u003cli\u003eTraditional Alternator Input Voltage: 13.2V – 16.0V DC\u003c\/li\u003e\n\u003cli\u003eSmart Alternator Input Voltage: 12.0V – 16.0V DC\u003c\/li\u003e\n\u003cli\u003eCompatible Batteries: AGM, Gel, Flooded Lead-Acid, LiFePO4 and Custom\u003c\/li\u003e\n\u003cli\u003eCommunication Protocol: RS485\u003c\/li\u003e\n\u003cli\u003eBluetooth Compatibility: Renogy BT-2 Module (Optional)\u003c\/li\u003e\n\u003cli\u003eOperating Temperature: -25°C to +60°C\u003c\/li\u003e\n\u003cli\u003eStorage Temperature: -40°C to +85°C\u003c\/li\u003e\n\u003cli\u003eIdle Power Consumption: Less than 15mA\u003c\/li\u003e\n\u003cli\u003eManufacturer Listed Certifications: CE, RoHS, FCC\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Renogy","offers":[{"title":"No","offer_id":55705909068152,"sku":"39586361568152","price":109.99,"currency_code":"GBP","in_stock":false},{"title":"Yes - BT-2 Bluetooth Module","offer_id":55705909100920,"sku":"69586361400920","price":143.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0410\/0669\/4551\/files\/renogy-12v-40a-rbc40d1u-dc-dc-battery-to-battery-charger-5386746.png?v=1792424422","url":"https:\/\/www.wiredcampers.co.uk\/products\/renogy-12v-40a-rbc40d1u-dc-dc-battery-to-battery-charger","provider":"Wired Campers Limited","version":"1.0","type":"link"}