If you tow an RV, camper trailer, horse trailer, boat trailer, or work trailer, chances are you rely on an onboard battery to run lights, pumps, fridges, winches, or tools. But keeping that trailer battery properly charged while you drive isn’t always simple.
That’s why many setups now use a trailer battery charger.
A trailer battery charger is installed in the trailer to keep its auxiliary battery charged while you’re towing. It draws power from the tow vehicle’s electrical system through the 7-way connector and, with the right model, it can also charge from solar.
Unlike a basic wire connection, a charger like the REDARC BCDC Trailer Charger delivers the correct charge profile, protects the tow vehicle’s starter battery, and avoids damaging fuses or wiring.
HOW DOES A TRAILER BATTERY CHARGER WORK?
When towing, the BCDC Trailer Charger takes power from your vehicle’s alternator and converts it into the right voltage and current for the trailer battery.
With select models, you can also connect a solar panel so the battery charges even when the tow vehicle is parked with Green Power Priority™. This flexibility makes it ideal for off-grid camping, remote worksites, and long trips.
WHY DO YOU NEED A TRAILER BATTERY CHARGER?
- Reliable trailer pwoer - Without a battery charger, your trailer battery may undercharge or fail when you need it most. A trailer charger keeps your battery topped up and dependable.
- Works with modern vehicles - Newer vehicles with smart alternators often don’t provide enough power for auxiliary batteries. A trailer battery charger ensures a full, proper charge regardless of alternator type.
- Supports solar power - For off-grid setups, solar panels can plug directly into compatible chargers, keeping batteries charged without running the vehicle.
- Protects your tow vehicle - Instead of overloading your starter battery or alternator, a trailer charger manages the current safely, preventing damage to the vehicle’s electrical system.
WHERE ARE TRAILER BATTERY CHARGERS USED?
Trailer-mounted chargers are essential across many applications:
- RV and Camper Trailers: Run pumps, fridges, lights, and appliances confidently.
- Horse Floats & Livestock Trailers: Power fans, lights, and cameras to keep animals safe and comfortable.
- Boat Trailers: Operate electric winches, lights, or accessories at the ramp without draining your start battery, so you can always get your boat home safely.
- Work Trailers: Keep tools and equipment running on job sites where mains power isn’t available.
WHY CHOOSE REDARC'S BCDC TRAILER BATTERY CHARGER?
REDARC’s BCDC Trailer Battery Charger range is engineered for tough environments and dependable charging performance.
Key benefits include:
- Easy installation inside the trailer with minimal wiring to the tow vehicle
- Built-in MPPT solar regulator for off-grid charging (BCDC1212S only)
- Compatible with AGM, Gel, lead-acid, and lithium batteries
- Sealed, weatherproof design to resist dust, water, heat, and vibration (BCDC1212S only)
- LED charge status indicators for quick diagnostics
- Multi-stage charging for maximum battery life and performance
With rugged construction and smart charging, REDARC’s BCDC Trailer Chargers are designed to keep your trailer battery charged and ready wherever you go.
To make the most out of your trailer charger, ensure you choose the right BCDC Trailer Charger for you.
Your trailer battery powers everything from creature comforts to critical equipment. But it’s only as reliable as the charge it receives. A REDARC BCDC Trailer Battery Charger ensures your trailer battery stays healthy, fully charged, and ready for every trip—whether you’re off-road, on the water, or at work.
To Learn more, explore REDARC’s REDARC BCDC Trailer Battery Charger range or speak with a REDARC dealer to learn more.
