{"product_id":"renogy-12v-40a-dc-to-dc-battery-charger","title":"Renogy 12V 40A DC to DC Battery Charger","description":"\u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 32px; margin: 0 0 40px;\"\u003e\n\u003cdiv style=\"flex: 2 1 320px; min-width: 0;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0643\/9128\/2937\/files\/renogy-40a-battery-to-battery-charger-with-four-terminals-three-leds-and-a-type-button.jpg\" alt=\"Renogy 40A battery to battery charger with four terminals, three LEDs and a type button\" width=\"1352\" height=\"937\" style=\"display: block; width: 100%; height: auto;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"flex: 3 1 320px; min-width: 0; text-wrap: pretty;\"\u003e\n\u003ch2 style=\"margin-top: 0;\"\u003eThe Renogy 12V 40A DC to DC Battery Charger Charges Your House Battery While You Drive and Stops When the Engine Does\u003c\/h2\u003e\n\u003cp\u003eThe Renogy 12V 40A DC to DC Battery Charger charges a 12V auxiliary battery from a vehicle's alternator at up to 40A and 584W. Renogy rates its charging efficiency at 94%, and it works with AGM, gel, flooded, sealed lead-acid and lithium iron phosphate batteries.\u003c\/p\u003e\n\u003cp\u003eIt's made for RVs, vans and small boats that run a second battery for lights, a fridge or electronics. It works with traditional and smart alternators, and its alternator running detection protects the starter battery.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\n\u003ch3\u003eRenogy 12V 40A DC to DC Battery Charger Features\u003c\/h3\u003e\n\u003ch4\u003eAlternator Running Detection\u003c\/h4\u003e\n\u003cp\u003eCharging continues only while the alternator is running, and it stops when the alternator stops. Renogy says the charger adjusts its charging mode at startup to protect the starter battery.\u003c\/p\u003e\n\u003ch4\u003eTraditional and Smart Alternators\u003c\/h4\u003e\n\u003cp\u003eRenogy lists an alternator input of 13.2-16.0VDC for traditional alternators and 12-16.0VDC for smart alternators (Euro 6). Smart alternators need the IGN signal wire, which is included. Traditional alternators don't need it.\u003c\/p\u003e\n\u003ch4\u003eFive Battery Types\u003c\/h4\u003e\n\u003cp\u003eChoose AGM\/SLD, GEL, flooded (FLD), lithium (LI) or a user mode with the Type button. For lithium, lithium battery activation can be turned on or off. The charger also has an RS485 communication port.\u003c\/p\u003e\n\u003ch4\u003eTemperature Sensor for Lead-Acid Batteries\u003c\/h4\u003e\n\u003cp\u003eThe included 2 m sensor reads the battery's surroundings and adjusts the charge voltage when the battery is cold. Renogy says not to use it on a LiFePO4 battery that has its own BMS, and the sensor port works with lead-acid batteries only.\u003c\/p\u003e\n\u003ch4\u003eProtections and Heat Handling\u003c\/h4\u003e\n\u003cp\u003eProtections include reverse polarity, overvoltage, over discharge, overcurrent and over temperature. In high-temperature conditions the charger reduces output to charge safely. Renogy calls the case corrosion-resistant and suited to small boat cabins and humid marine spaces.\u003c\/p\u003e\n\u003ch4\u003eCompact Layout With Spaced Terminals\u003c\/h4\u003e\n\u003cp\u003eThe charger measures 9.31 x 6.00 x 2.30 in. Input and output terminals are spaced apart to reduce short-circuit risk.\u003c\/p\u003e\n\u003cbr\u003e\n\u003ch3\u003eReal-World Applications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eRV and van house batteries.\u003c\/strong\u003e Charge a 12V lithium or AGM house battery from the alternator on the road.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSmart alternator vehicles.\u003c\/strong\u003e Connect the IGN signal wire so the charger knows when the engine is running.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSmall boat cabins.\u003c\/strong\u003e Renogy points to small boat cabins and humid marine environments for its compact case.\u003c\/p\u003e\n\u003cbr\u003e\n\u003ch3\u003ePractical Comparison\u003c\/h3\u003e\n\u003ch4\u003e40A Output Versus a Lower-Output Charger\u003c\/h4\u003e\n\u003cp\u003eA higher-output charger can refill a house battery faster while the alternator runs, but it needs heavier cable and fuses. This charger's quick guide calls for 8 AWG cable on the auxiliary battery side and 6 AWG on the starter battery side.\u003c\/p\u003e\n\u003ch4\u003eDC to DC Charger Versus a Direct Connection\u003c\/h4\u003e\n\u003cp\u003eA direct connection passes the alternator's voltage to the house battery as is. This charger runs a charge profile for your battery type and stops when the alternator isn't running.\u003c\/p\u003e\n\u003cbr\u003e\n\u003ch3\u003eBuyer Guidance\u003c\/h3\u003e\n\u003ch4\u003eWiring, Fuses and Alternator Limits\u003c\/h4\u003e\n\u003cp\u003eRenogy's quick guide calls for 8 AWG cable and a 40A ANL fuse on the auxiliary battery side, with cable no longer than 3 meters. On the starter battery side it calls for 6 AWG cable and an 80A ANL fuse. Before installing, check with your vehicle manufacturer that the alternator power doesn't exceed 720W with output current in the range of 75A to 100A. Leave 5.91 in (150 mm) of clearance on all sides. Fuses and cables aren't included.\u003c\/p\u003e\n\u003ch4\u003eMonitoring Needs a Bluetooth Module\u003c\/h4\u003e\n\u003cp\u003eTo monitor in the Renogy app, add Renogy's BT-2 Bluetooth module to the communication port. It's not part of this option.\u003c\/p\u003e\n\u003ch4\u003eThis May Be A Good Fit If\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eYou charge a 12V house battery from an alternator\u003c\/li\u003e\n\u003cli\u003eYou want protection for the starter battery\u003c\/li\u003e\n\u003cli\u003eYour vehicle has a smart or traditional alternator\u003c\/li\u003e\n\u003cli\u003eYou use AGM, gel, flooded or lithium batteries\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003ch3\u003eCommon Questions\u003c\/h3\u003e\n\u003ch4\u003eWhat Batteries Does It Charge?\u003c\/h4\u003e\n\u003cp\u003eBy default it supports 12V AGM, flooded lead-acid, gel, sealed lead-acid and lithium iron phosphate. A custom mode lets you adjust settings.\u003c\/p\u003e\n\u003ch4\u003eHow Do I Get Communication?\u003c\/h4\u003e\n\u003cp\u003eRenogy says to connect its BT-2 Bluetooth module to the communication port. That links the charger to the Renogy app and ONE Core.\u003c\/p\u003e\n\u003ch4\u003eAny Installation Tips?\u003c\/h4\u003e\n\u003cp\u003eMount the charger horizontally for better venting and heat dissipation, and place it near the service battery.\u003c\/p\u003e\n\u003cbr\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Renogy 12V 40A DC to DC Battery Charger\u003c\/li\u003e\n\u003cli\u003e1 x Battery Temperature Sensor (2 m)\u003c\/li\u003e\n\u003cli\u003e1 x IGN Signal Wire (3 m)\u003c\/li\u003e\n\u003cli\u003e4 x Terminal Rings\u003c\/li\u003e\n\u003cli\u003e4 x Mounting Screws\u003c\/li\u003e\n\u003cli\u003e1 x User Manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003ch3\u003eAlternator Charging Built for Heavier Loads\u003c\/h3\u003e\n\u003cp\u003eThe Renogy 12V 40A DC to DC Battery Charger gives your house battery a managed 40A charge from the alternator and stops when the engine stops. If you'd like help with cable, fuse and alternator questions, the Outbound Power team is happy to help.\u003c\/p\u003e\n\u003cbr\u003e\n\u003ctable style=\"border-collapse: collapse; max-width: 100%; overflow-x: auto;\" cellspacing=\"0\" cellpadding=\"8\" border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth colspan=\"2\" style=\"background-color: rgb(242, 242, 242); text-align: left; width: 100%;\"\u003e\n\u003ch3\u003eRenogy 12V 40A DC to DC Battery Charger Specifications\u003c\/h3\u003e\n\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background-color: rgb(242, 242, 242);\"\u003e\u003cstrong\u003eInput\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 44.1489%;\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 55.8511%;\"\u003eRBC40D1U\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSystem Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12 V to 12 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAlternator Input Voltage, Traditional\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13.2 to 16.0 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAlternator Input Voltage, Smart (Euro 6)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12 to 16.0 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Fuse Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e60 A (product page); 80 A starter side ANL fuse (quick guide)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background-color: rgb(242, 242, 242);\"\u003e\u003cstrong\u003eOutput\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Output Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e40 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e584 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Fuse Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50 A (product page); 40 A auxiliary side ANL fuse (quick guide)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background-color: rgb(242, 242, 242);\"\u003e\u003cstrong\u003eCharging\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Types\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAGM, Gel, Flooded, Lithium Iron Phosphate, User\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharging Efficiency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e94%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTemperature Compensation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-3 mV\/°C per 2 V (non-lithium); none (lithium)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIdle Power Consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLess than 15 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGrounding\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCommon negative\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCommunication Protocol\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRS485\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background-color: rgb(242, 242, 242);\"\u003e\u003cstrong\u003eProtection\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProtections\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eReverse polarity, overvoltage, over discharge, overcurrent, over temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCertifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCE, RoHS, FCC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background-color: rgb(242, 242, 242);\"\u003e\u003cstrong\u003eSize and Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTerminal Wire Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 AWG to 8 AWG \/ 8 AWG to 6 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAuxiliary Battery Cable\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 AWG (quick guide)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStarter Battery Cable\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6 AWG (quick guide)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9.31 x 6.00 x 2.30 in (236.5 x 152.5 x 58.4 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4.14 lb (1.88 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-4°F to 122°F (-25°C to 60°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage Temperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-4°F to 122°F (-40°C to 85°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHumidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0% to 95%, no condensation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaximum Operating Altitude\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3000 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting Clearance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5.91 in (150 mm) on all sides\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background-color: rgb(242, 242, 242);\"\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2-year material and workmanship warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cbr\u003e\n\u003ch3\u003eRenogy 12V 40A DC to DC Battery Charger Manual\u003c\/h3\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0643\/9128\/2937\/files\/renogy-12v-40a-dc-to-dc-battery-charger-quick-guide.pdf\" title=\"Renogy 12V 40A DC to DC Battery Charger Manual\" rel=\"noopener\" target=\"_blank\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0643\/9128\/2937\/files\/renogy-12v-40a-dc-to-dc-battery-charger-manual.jpg\" alt=\"Renogy 12V 40A DC to DC Battery Charger Manual\" width=\"100\" height=\"100\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/a\u003e\u003c\/div\u003e","brand":"Renogy","offers":[{"title":"Default Title","offer_id":67614429249785,"sku":"RBC40D1U-US","price":186.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0643\/9128\/2937\/files\/renogy-12v-40a-dc-to-dc-battery-charger-front-view-with-alt-and-bat-terminals-and-status-lights.jpg?v=1793974270","url":"https:\/\/outboundpower.com\/products\/renogy-12v-40a-dc-to-dc-battery-charger","provider":"Outbound Power","version":"1.0","type":"link"}