Renogy 12V 40A DC to DC Battery Charger w/ MPPT 1 / 8
Renogy

Renogy 12V 40A DC to DC Battery Charger w/ MPPT Renogy 12V 40A DC to DC Battery Charger w/ MPPT

SKU: RBC40D1S-G1-US

Brand Renogy In Stock
$205.99 In Stock
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Key features
  • Maximum Charging Current 40A
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Renogy 12V 40A DC to DC Battery Charger w/ MPPT

In Stock
Renogy 12V 40A DC to DC Battery Charger w/ MPPT
Quantity$205.99 each
1

Renogy 12V 40A DC to DC Battery Charger with MPPT

Keep a compatible house battery charged while driving or parked with a charger designed to switch between DC input and solar input. Use the SELECT button to set solar-priority charging for appropriate system conditions.

Renogy 40A DC-DC battery charger with MPPT charging overview

Switch between solar and DC charging inputs efficiently while maintaining dependable charging support for a compatible mobile power system.

Renogy 40A DC-DC charger supporting mobile off-grid charging

Seamlessly Switch Charging Modes

When input voltage in the primary charging mode drops below the default threshold, the charger automatically switches to the alternate source to maintain efficient charging.

DC Priority

Renogy 40A DC-DC charger DC priority mode

Solar Priority

Renogy 40A DC-DC charger solar priority mode

Understand the Charging Logic Behind Each Model

Renogy presents the 40A model as switching between solar and DC inputs according to availability, while the compared 30A and 50A models support simultaneous dual input.

Renogy MPPT DC-DC charger model charging logic comparison

Get to Know the Key Points

The 40A model combines MPPT/DC-input charging with SELECT-button mode switching for compatible mobile power systems.

Renogy 40A charger key feature comparison

Stay Charged on the Move

Renogy 40A DC-DC charger RV application

Stay Charged on the Drive

Renogy 40A DC-DC charger SUV application

Stay Charged on the Water

Renogy 40A DC-DC charger boat application

Multiple Safety Certifications

The live Description presents certification testing as part of Renogy’s focus on dependable off-grid power performance.

Renogy 40A charger certification and safety documentation

Wiring Diagram

The verified in-description wiring diagram illustrates a compatible connection layout for the starter battery, house battery, alternator and solar input.

Renogy 40A DC-DC charger wiring diagram

Plan alternator charging

Our RV DC-to-DC charger guide explains when a DC-to-DC charger is useful in an RV battery system and which electrical limits to check.

Compare a related option

Compare the MPPT and non-MPPT 40A DC-to-DC chargers; inspect their solar and alternator input specifications.

Renogy 12V 40A DC to DC Battery Charger

12V 40A DC to DC Battery Charger w/ MPPT
Package Includes
1 12V 40A DC to DC Battery Charger w/ MPPT
Heat-Shrink Tubing
Package Includes
7 Heat-Shrink Tubing
Self-Tapping Screw
Package Includes
4 Self-Tapping Screw
User Manual
Package Includes
1 User Manual
Renogy 12V 40A DC to DC Battery Charger w/ MPI
Selected variant SKU RBC40D1S-G1-US
Specifications
Dimensions 195 x 149 x 48mm
Weight 1.07kg
DC Input Voltage Range 11.2V-24V
Solar Input Voltage Range 12V-30V
Output Voltage 7V-16V
Max. Output Power 616W
Max. Input Current 45A
Rated Output Current 40A
Voltage Accuracy ±200mV
Current Accuracy ±5%
Standby Current <10mA
Typical Conversion Efficiency 93%
MPPT Maximum Tracking Efficiency >99%
Charging Mode 4 Modes
Battery Compatibility Sealed/AGM, GEL, Flood, LifePO4
Waterproof Rating IP-31
Operation Temperature -20°C to 45°C
Storage Temperature -20°C to 60°C
Humidity 0%~90% non-condensing
Dimension tolerance ±0.02 in (0.5 mm)
Working Voltage U U1+U2+U3 Working Voltage U: U1=U2=U3
Low Voltage Reconnect 13.2V 13.2V 13.2V 13.6V
System Voltage 12V
Maximum Charging Current 40A
Nominal Output Power 616W
Operating Temperature -4°F to 113°F /-20°C to 45°C
Dimensions (LxWxH) 195 x 149 x 48 mm / 7.68 x 5.87 x 1.89 inch
Maximum Input Power 670W
Maximum Input Current 45A ±5%
📘
User Manual
Installation instructions, setup guidance, operation, and troubleshooting.
View PDF
📄
Specification Sheet
Product documentation and manufacturer terms.
View PDF
📄
Warranty Sheet
Product documentation and manufacturer terms.
View PDF

Frequently Asked Questions

Clear answers to common questions about this product, setup, compatibility, and use.

How does the 12V 40A DC-DC charger with MPPT divide charging between alternator and solar input? Renogy publishes these model-specific details: Solar Input Voltage: 10 -30V DC; Alternator Input: Traditional Alternator: 13.2-16.0VDC; Smart Alternator (Euro 6): 12-16.0VDC; Traditional Alternator: 13.2-16.0VDC; Smart Alternator (Euro 6): 12-16.0VDC. Verify alternator type and capacity, starter-system voltage, ignition signaling, any PV input limits, and the vehicle manufacturer's restrictions before connecting an onboard charger. Which house-battery chemistry and nominal voltage can the 12V 40A DC-DC charger with MPPT charge? Renogy publishes these model-specific details: Battery Types: AGM, Gel, Flooded, Lithium-iron Phosphate. Match the profile to the battery manufacturer's required bulk, absorption, float, temperature, and BMS limits; similar nominal voltage does not make every chemistry interchangeable. When will the 12V 40A DC-DC charger with MPPT deliver less than its advertised charge current? Renogy publishes these model-specific details: Maximum Output Current Rating: 40A; Output Voltage: 10 -16V DC; Output Power: 616W; Output Fuse Rating: 50A. Source limitations, alternator temperature, battery acceptance, programmed limits, cable drop, and thermal protection can reduce real output. Charging current is not guaranteed at every engine speed or state of charge. Is Bluetooth monitoring built into this 12V 40A dual-input DC-DC charger? Bluetooth is not identified as built into this exact model. Do not assume app monitoring from the MPPT feature alone; if remote data is required, confirm a compatible Renogy communication accessory and its supported readings before ordering. What wiring and circuit protection should be budgeted for the 12V 40A DC-DC charger with MPPT? Renogy publishes these model-specific details: Operating Temperature: -4℉ -113℉ /-20 ℃ - 45℃; Storage Temperature: -4℉ -140℉ /-20 ℃ - 60℃; Dimensions (LxWxH): 195 x 149 x 48 mm / 7.68 x 5.87 x 1.89 inch; Input Fuse Rating: 60A. Size input and output conductors, fuses or breakers, disconnects, grounding, and strain relief from maximum current and route length, not merely from the charger's front-panel rating.