12V 20A DC to DC On-Board Battery Charger

SKU: RNG-DCC1212-20-EU
Was: €139.99
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The DC-DC Battery Chargers are the most effective way to charge your house batteries from the starter battery. Compatible with a multitude of alternator types, the DC-DC battery charger offers correct charging for AGM, Flooded, Gel, and even Lithium deep cycle batteries! Featuring a 3-stage battery charger and multiple electronic protections, users can feel confident that their batteries are being charged optimally and automatically. For additional safety, it isolates the input from the output preventing incorrect voltage transmission. Easily install the compact yet sturdy DC-DC battery charger on RV's, commercial vehicles, boats, yachts, and many more applications!

  • 【Compatible Multiple Battery Types】 Compatible with a multitude of alternator types, the DC-DC battery charger offers correct charging for AGM, Flooded, Gel, and Lithium batteries.
  • 【Smart 3-stage Charging】 The DC-DC battery charger will charge your house batteries from the starter battery by 3-stage charging (Bulk, Boost, and Float), to make sure it optimally and automatically charge to 100%.
  • 【Various Protections For Ultra Safety】 Offers Over-voltage Protection, Over-temperature Protection, and Reverse Polarity Protection to ensure the operation safety. It also isolates the input and output to prevent voltage transmission errors and interfere with house battery charging.
  • 【Protect Your Starter Battery】 The DC-DC battery charger is capable of identifying whether the generator is started, to prevent over-discharge of the starting battery and protect the generator. (18-16AWG copper cable recommended. Please note the D+ Ignition Cable is not included.
  • Protect Your House BatteryThe LC wire can automatically adjust the charging current to prevent excessive charging current from damaging the house battery. (18-16AWG copper cable recommended. Please note the LC cable is not included.)
  • 【Prolong Battery Lifespan】The charger needs to select the charging mode according to the battery voltage. By utilizing the DC-DC temperature sensor, this charger is able to protect your battery from high or low temperature by giving -3mV/°C/2V compensation so that the charger recognizes the voltage more accurately and assures stable and constant charging to the battery. (Please note the temperature sensor is not included and it cannot use with Lithium batteries.)

This diagram shows the whole connection of the DC-DC On-Board Battery Charger. 

  • If you have any questions regarding this product, please email us at supporteu@renogy.com for troubleshooting assistance.

Package Includes

Renogy 20A DC to DC Battery Charger

Renogy 20A 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

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?
  • Make sure that the entire system is a 12V system
  • 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.
Renogy DC-DC Battery Charger Manual