This nifty charger by Renogy is simply the smartest and best value on the battery charging market. At a controlled 30A of output, this charger can take our GoWesty LiFePo4(100AH) Battery from dead to full in just three hours of driving! 

After hooking up only five wires, all of these features are handled by this Renogy charger:

• Dual-Input Charging: Automatically combines alternator and solar power, prioritizing solar energy to reduce alternator load.

• High Power Output: Delivers a maximum of 50A/720W output, capable of charging a 1.2kWh battery in approximately 1.8 hours.

• IP67 Waterproof: Fully dust and waterproof enclosure designed for harsh, damp, or confined mounting locations.

• Multi-Voltage Support: Features internal boost/buck logic to support both 12V and 24V system configurations.

• Built-in MPPT: Integrated controller with 94% efficiency to maximize power harvest from solar panels.

If you're setting up an electrical system to quickly charge your auxiliary battery - and especially if you're jumping into the 21st century with a LiFePo4 battery setup - this DC-DC Charger could be everything you need in one box. Check out the "Features" tab to see more details on how all these fancy electronics interact.

Note: The Renogy DC-DC charger is designed exclusively for direct current (DC) input from your alternator and solar panels. It cannot be used with a standard 110V AC household outlet. If you need to charge from a 110V AC source, we recommend the NOCO Genius GenPro 10x2 Battery Charger. Also, this charger does not include the additional wires/terminals required to connect it to your batteries or solar panel.

Check out our full Auxiliary Battery Bundle here.

IMPORTANT 30A CHARGING LIMIT NOTICE: It is imperative that the DC-DC charge controller be programmed to a maximum charging output of 30A. Download the DC Home App to make this change. Failure to do so can damage your Vanagon electrical system and the GoWesty auxiliary battery system, and may create a hazardous operating condition. We selected this 50A DC-DC charge controller specifically because of the advanced features it offers that lower-amperage units do not provide. However, the Vanagon electrical system, and the GoWesty auxiliary battery system designed to work with it, are intended for a maximum charging rate of 30A. While our 100Ah battery is capable of accepting charging rates up to 100A, the factory Vanagon charging system is not designed to safely support charging above 30A. A properly configured 30A charging rate remains fast, efficient, and safe for long-term use. If you wish to charge at rates higher than 30A, we also offer the battery and charge controller separately for use in custom-designed charging systems.

There's a lot going on in this charger, and that's the best thing about it! Here's a more in-depth run down of how all these features are integrated:

Isolation: Battery isolators (like our Aux Battery kits) allow you to discharge your auxiliary (also called coach or house) battery without draining your main (also called starter) battery. This is the whole point of having a second battery, enabling you to run a fridge, heater, lights, etc. and still know that you've got juice to start the van the next morning. This Renogy unit senses the voltage of the main battery, watching for alternator voltage to isolate the auxiliary battery automatically, and has status lights to tell you when it's charging. Crucially, this charger can unlatch the BMS on a LiFePo4 battery if it goes into a disconnected mode, so you can recharge it after you fully draining, freezing, or overheating your battery.

DC-DC Charging: A battery isolator supplies alternator voltage to the auxiliary battery while the vehicle is running. For many Vanagon owners, a simple isolator or solar panel is adequate to keep an aux battery topped off. But for those that want to take advantage of fast charging with LiFePo4 batteries, those with large battery banks, or Eurovan owners that need to charge LiFePo4 batteries off of their "smart" alternators, a DC-DC charger is really the only way to go. This Renogy DC-DC charger, unlike a simple isolator, can independently adjust the charge voltage of the auxiliary battery to a higher voltage than the alternator puts out. The charge profile can be varied to work with any common aux battery so that the charge voltage can be optimized for any type of battery and its state of charge. This allows for rapid battery charging at as much as 50A. With this Renogy charger, two hours of driving can fully recharge a GoWesty LiFePO4 battery!

MPPT Solar Charge Controller: Most important for the typical camper with a single 100W panel: this MPPT controller is much more efficient than a typical PWM controller. Using an MPPT controller under common conditions, your solar panel will supply 25% more power to your battery than it could with a PWM controller. That difference is huge if you only want to store one solar panel in your van. The integration of both an MPPT and a DC-DC charger into one unit also allows for a lot of clever operational features. The MPPT solar controller alone can charge at up to 50A if you have a large array of panels. Solar and alternator power can be used at the same time... resulting in a combined maximum of 50A charging (split as 25A from each source) with less load on your alternator. You can also use the solar input to charge your main battery in addition to your aux battery. This main battery float charge is only enabled when the auxiliary battery is fully charged so that no solar power is wasted.

Reference numbers can be OE part numbers, superseded part numbers, and compatible part numbers. We provide this information to help ensure you're getting the right part for your needs.

• RBC2125DS-21W-US

Renogy DC-DC Charger / Solar Controller Wrench Rating

• DIY — Requires a full tool set and broad mechanical knowledge.

All Wrench Ratings

• Plug 'n' Play — Requires no or basic hand tools and no mechanical knowledge.
• Handy — Requires some hand & power tools and minimal mechanical knowledge.
• DIY — Requires a full tool set and broad mechanical knowledge.
• Pro — Requires professional-level tools, talent and experience.

Proposition 65: This product may contain chemicals known to the state of California to cause cancer, birth defects, or other reproductive harm.