Renogy 24/7 AI Agent | 6AM to 5PM PT Live Chat | Submit a Case Anytime Contact Us
Popular Searches
Hot 2000W Inverter Hot 300Ah Batteries Hot 3000W Inverter Hot 320W Solar Panel Pro S1 Series LiFePO4 Batteries Hot ShadowFlux
1 8

12V 20A/40A DC to DC Battery Charger

SKU: RBC40D1U-US
$186.99
+   Renogy Rays after purchase.
Log In Learn More

Member Price: Log in and add to cart to enjoy 8% off
valid until 2026-02-10
BC8
  • Alternator running detection safeguards the starter battery.
  • Simple and compact layout for easy installation.
  • BT-2 Bluetooth enables remote monitoring, records 365-day data.
  • Advanced protections ensure efficient & safe charging.
  • Li Battery Activation On/Off offers customizable performance.
Option
5% OFF Coupon for New Subscriber
30-Day Return and Refund Service
Lifetime Customer Support
Show More Benefits Show Less
Quantity：
Payment Methods
Delivery Methods
Delivery time: 1-3 business days.Shipping Policy
Request Bulk Purchase Prices
Request Bulk Purchase Prices
For Home use For Business Use
Description
Includes
Specs
Downloads
FAQ
Reviews

Renogy 12V 40A DC to DC Battery Charger

Elevate your driving charging experience with smart control.

Advanced High-Temperature Performance

The second-gen DCC charger intelligently adjusts output power In high-temp environments to ensure efficient and safe charging.

Optimize Battery Health

Enable or disable lithium battery activation based on battery status via the DC Home app, extending battery lifespan.

Smart Control for Simplicity and Efficiency

Effortless remote monitoring and control of charging parameters.

Quieter Cooling Solution

Experience enhanced performance with natural heat dissipation and reduced 30dB noise levels

Corrosion-Proof for Long-Term Use

This compact and corrosion-proof charger is the ideal option for installation in small boat cabins and humid marine environments.

Stronger. Smarter. Safer.

The new 40A DC-DC battery charger is enhanced across the board—with higher charging efficiency and superior full-load performance even in high temperatures. Now with Bluetooth connectivity, you can monitor your system in real-time through the DC Home app. Upgrade your charger and enjoy a smarter, more reliable power experience on the road.

Comprehensive Accessories for Easy Installation

The included battery temperature sensor provides real-time data to the charger, allowing them to adjust charging parameters accordingly for optimal performance.

Package Includes

Battery Charger

x 1

Battery Temperature Sensor (2m)

x 1

IGN Signal Wire (3m)

x 1

User Manual

x 1

Terminal Ring

x 4

12V 40A DC to DC Battery Charger

Model
RBC40D1U
Terminal Range
10AWG - 8AWG/8AWG - 6AWG
Grounding
Common Negative
Communication Protocol
RS485 Communication
Operating Temperature Range
-4℉ -122℉ /-25 ℃ - 60℃
Storage Temperature Range
-4℉ -122℉ /-40 ℃ - 85℃
Humidity
0%-95%, No Condensation
Maximum Operating Altitude
3000m
Enclosure Rating
0%- 95% ,no condensation
Dimensions
9.31 in (236.5 mm)x6.00 in (152.5 mm)x2.30 in(58.4 mm)
Weight
4.41 lb (1.88 kg)
Certification
CE/RoHS/FCC
Protection
Reverse Polarity Protection/Overvoltage Protection/Over Discharge Protection/Overcurrent Protection/Over Temperature Protection

ELECTRICAL DATA Specification

System Voltage
12V-12V
Alternator Input Voltage
Traditional Alternator: 13.2-16.0VDC Smart Alternator (Euro 6): 12-16.0VDC
Maximum Output Current Rating
40A
Output Power
584W
Battery Types
AGM, Gel, Flooded, Lithium-iron Phosphate，User
Input Fuse Rating
60A
Output Fuse Rating
50A
Charging Efficiency
94%
Temperature Compensation (Non-Lithium)
-3mV / ℃ / 2V (Non-Lithium)
Temperature Compensation (Lithium)
0mV / ℃ / 2V; no compensation (Lithium)
Idle Power Consumption
＜15mA

WARRANTY INFORMATION

Material and workmanship warranty
2-year

Resources Download

Quick Guide

Download

User Manual

Download

Warranty

Download

Frequently Asked Questions

When installing the DC-DC battery charger, are there any precautions I need to be aware of?

First, installing the charger horizontal will improve venting and heat dissipation of the charger. Additionally, positioning the DC-DC charger nearer the service battery is advised.

What types of batteries can the charger be used for?

Our charger is compatible with the following 12V battery types by default:
AGM (Absorbent Glass Mat)
FLD (Flooded Lead-acid)
GEL (Gelled Electrolyte)
SLD (Sealed Lead-acid)
LI (Lithium Iron Phosphate)
In addition, our charger also features a custom mode, which can be adjusted according to the specific needs of different batteries to ensure optimal charging performance.

How does the charger have communication functionality?

To enable communication, purchase the RENOGY BT-2 Bluetooth module and connect it to the charger's communication port. This will establish communication with mobile terminals like DC Home and Core, granting access to crucial data.

What stages of charging logic do smart chargers typically include?

Smart chargers typically feature a four-stage charging logic design, encompassing the bulk charge stage, constant voltage stage, float charge stage, and equalization stage. These stages ensure that batteries can be charged safely and efficiently.

Reviews

Best Sellers

Recent Blogs

  • Solar Gel Batteries: Everything You Need to Know

    Solar Gel Batteries: Everything You Need to Know

    As solar power gains popularity, backup power becomes increasingly critical, as does the addition of energy storage to grid-tied solar panels. However, with so many different types of solar cells...

  • what size charge controller do i need

    Solar Charge Controller Sizing and How to Choose One

    Authors Note: This has been updated on Feb 23, 2022 with updated information, links, and resources. Solar charge controllers are a critical component in every solar installation. They protect your...

  • solar panel to charge 12v battery

    What Size Solar Panel to Charge 12v Battery

    Discover what size solar panel to charge 12v battery. Learn how to charging battery with solar panel, including calculate wattage, consider battery capacity, and optimize your solar charging setup for...

  • lithium batteries in cold weather

    How Do Lithium Batteries Perform in Cold Weather?

    Lithium batteries offer a reliable power solution for anyone using solar energy, off-grid homeowners, boaters, and RVers. The lightweight structures, longer lifespans, and higher energy densities make these batteries different...

  • best solar system for home

    How to Choose Solar Power Systems: Beginners Guide

    If you are exploring renewable energy for your home, RV, tiny home, or off-grid setup, choosing the right solar power system can feel overwhelming. With countless options for panels, batteries,...

  • battery cable size chart

    Battery Cable Size Chart - Everything You Need

    The right battery cable size is key to properly functioning the electrical systems. Most importantly, it ensures safety by reducing fire risks. Battery cables are essential for transferring power from...

  • winter rv camping

    10 Essential Tips for Winter RV Camping

    Winter RV camping offers an entirely different adventure. You get a chance to see peaceful campgrounds, amazing landscapes, and snowy forests — all without paying high prices for plane tickets....

Have questions?
Chat with AI/an Agent.