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12V 20A/40A/60A DC to DC On-Board Battery Charger

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12V 20A/40A/60A DC to DC On-Board Battery Charger

SKU: RNG-DCC1212-40-G1-US
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Start group buy • $168.99 $235.99
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12V 20A/40A/60A DC to DC On-Board Battery Charger
12V 20A/40A/60A DC to DC On-Board Battery Charger
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12V 20A/40A/60A DC to DC On-Board Battery Charger
Start group buy • $168.99 $235.99

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-Compatible with AGM, Flooded, Gel, and Lithium batteries.
-Use 3-stage charging-Bulk, Boost, and Float to ensure charge to 100%.
-All-round electronic protections for ultra safety.
-Protect your starter battery.
-Compact and robust design with CE certification.
Empower Your Journey on the Go
Maximize charging efficiency on the go with enhanced versatility.
Seamless Charging, Ultimate Safety
Isolated input/output with multifunctional safety technology for error-free and secure house battery charging.
Compatible with Multiple Battery Types
The DC-DC battery charger is highly compatible with AGM, Flooded, Gel, and Lithium batteries, ensuring optimal performance for various battery types.
Protect Your Starter Battery

Renogy's DC-DC battery charger works seamlessly with traditional and smart alternators. The included D+ Ignition cable identifies generator starts, safeguarding the starting battery from over-discharge and protecting the generator. (Recommended: 18-16AWG copper cable. D+ Ignition Cable not included.)

Smart Charging Protection

The DC-DC battery charger's LC wire automatically adjusts the charging current, safeguarding the house battery from potential damage due to excessive charging. (Recommended: 18-16AWG copper cable. LC cable not included.)

Smart 3-Stage Charging
Efficiently charge your house batteries from the starter battery with Bulk, Boost, and Float stages, ensuring automatic and optimal charging up to 100%.
Prolong Battery Lifespan
Automatically adapts charging modes to match battery voltages, while the temperature sensor provides -3mV/°C/2V compensation, ensuring optimal charging in varying temperatures. (Please note: Temperature sensor not included, not compatible with Lithium batteries.)
Explore the Complete Connection



Package Includes

Renogy 40A DC to DC Battery Charger

Renogy 40A DC to DC Battery Charger

1 x


Renogy 20A DC to DC Battery Charger 
System Voltage: 12VDC Equalization Voltage: N/A
Rated Charge Current: 20A Float Voltage: 13.2-13.8v
Rated Max Power: 250W Boost Voltage: 14.1-14.7v
Idle Power Consumption: <0.4A Operating Temperature: -20°C to +50°C
Input Voltage Range: 8V-16V Dimensions: 8.3 x 6.9 x 2.7 in / 211 x 175 x 68 mm
Weight: 3 lbs. / 1.3 kg  Certification: CE ROHS
Renogy 40A DC to DC Battery Charger 
System Voltage: 12VDC Equalization Voltage: N/A
Rated Charge Current: 40A Float Voltage: 13.2-13.8v
Output: 500W Boost Voltage: 14.1-14.7v
Idle Power Consumption: <0.4A Operating Temperature: -20°C to +50°C
Input Voltage Range: 8V-16V Dimensions: 10.3 x 6.9 x 2.7 in / 261 x 175 x 68 mm
Weight: 4 lbs. / 1.9 kg  Certification: CE ROHS
Renogy 60A DC to DC Battery Charger 
System Voltage: 12VDC Rated Charge Current: 60A
Output: 750W Idle Power Consumption: <0.4 A
Input Voltage Range: 8V-16V Equalization Voltage: N/A
Float Voltage: 13.2-13.8V Boost Voltage: 14.1-14.7V
Operating Temperature: -20°C to +50°C Weight: 5.3 lbs. / 2.4 kg
Dimensions: 12.2 x 6.9 x 2.7 in / 311 x 175 x 68 mm Terminals: M8 X 10mm, 1mm thread pitch
Certification: CE ROHS  

Warranty Information

Accessories 1-year material warranty

1. What is a DC-DC charger? What is its purpose?

The DC-DC battery charger is installed between the starter battery and the house battery. For the RV system, The generator ensures stable power supply to the starter battery, and uses the extra power of the starter battery to supply power to the house battery.

2. How to choose a suitable battery charger?


1. Make sure that the entire system is a 12V system

2. Ensure that the maximum charging current provided by the DC-DC battery charger does not exceed the maximum charging current allowed by the house battery

3. How to set the charging voltage value of the charger?

The DC-DC battery charger adopts the design of the DIP switch and it provides 6 charging voltage settings through five gears. These six charging voltages meet the requirements of lithium batteries and lead-acid batteries in order to provide more charging options. SW5 switch is the selection switch for switching between lead-acid batteries and lithium batteries.

4. What is the D+ Ignition cable? Is it necessary to connect?


The D+ Ignition cable is a design method used to identify whether the generator is started. This design method can well prevent the starting battery from being over-discharged during the charging process. When the generator is started, a signal will be obtained on the D+ Ignition cable, which will light up the indicator light of the charger.

The DC-DC will not power on or operate until the D+ ignition cable is connected.

5. How can I get these cables?

The battery temperature sensor for DC-to-DC car battery chargers can be purchased at the Renogy store. The D+ ignition cable can be purchased at the local store or online, it suits both D+ and LC terminals. 18-16AWG copper cable recommended.

More questions about your off-grid power system? Learn more from Renogy Learning Center!

Renogy DC-DC Battery Charger Manual

6 Reviews Hide Reviews Show Reviews

  • 5
    DC-DC 40A charger

    Posted by Christopher Wood on Dec 24th 2023

    Looks like of a quality build. Install was good time will tell how it performs on the road.

  • 5
    Does exactly what it’s supposed to do.

    Posted by Himey on Feb 17th 2023

    Bought this and a 200ah agm a month ago, a real lifesaver in this case. I work construction very remotely and sleep in a van. After a failure of another brand of solar power station I needed something to run my diesel heater at night. This was shipped very fast and does its job flawlessly. I’ll definitely by buying more renogy products!

  • 5
    Great features

    Posted by Freddy454 on Jan 27th 2023

    Bought a month ago and so far it works great. Just what I needed to keep my secondary battery charge on my truck and topped off. .

  • 5
    Great product!

    Posted by Dave M on Mar 26th 2022

    Much faster charging for our truck camper batteries than the stock trailer plug.

  • 5
    Looks like a good investment

    Posted by Alpine2021 on Dec 5th 2021

    I bought this a month ago but just installed it this weekend. Everything went well and I’m very pleased so far. After redoing the wiring on both my truck and 5fr things looks good. Updated my alternator on my 2003 Dodge Ram 3500 diesel from 130amps to 180amp. I did a direct hookup to my battery’s and ran 4 gauge awg welding wire to 175 amp Anderson type connectors. Tested and all was good. Got 40 amp at my Renogy battery bank. Turned the power off from shore power and let my battery’s go down till morning. Hooked it to my truck and all began to charge well even at idle. Will update after the first of the year as we’re planned to go camping during Christmas. Merry Christmas to all.

  • 5
    Great supplement to RV solar

    Posted by Matt on Nov 21st 2021

    Finally! Finally I have power while I drive going to my RV battery. I have always relied on just solar but that’s not always a guarantee. Easy install, added a on/off switch so I can turn off the vehicle 12v so it turns off if I want. Thanks Renogy