If you’re setting up a dual battery system, choosing the right BCDC charger is key. These chargers keep your auxiliary battery powered while you’re driving, so you can run your fridge, lights, and other gear without worrying about losing power.
Learn more about what a BCDC Dual Battery Charger is here. With several models to pick from, the choice can seem confusing. This guide breaks it down so you can choose the right charger for your needs.
THE THREE TIERS: CLASSIC, ALPHA, AND ALPHA R
CLASSIC - PROVEN PERFORMANCE
The BCDC Classic is the flagship DC charger in the range. It’s built for engine bay installations and works well with single batteries or large battery banks. Known for reliability, it’s a favorite among off-roaders worldwide.
Best for:
- Engine bay installs in any fuel-powered vehicle
- Single or large auxiliary batteries
- Everyday loads, as long as the charger size matches your power usage
- People who want a simple, dependable, set and forget option
ALPHA - MORE CONTROL AND PROTECTION
The BCDC Alpha adds advanced features like start battery recovery, current limiting, and Bluetooth® for monitoring and updates. It’s especially useful for hybrid or newer vehicles and for people using lithium batteries with heaters.
Best for:
- Lithium batteries with heaters
- Newer vehicles and hybrids
- Engine bay or in-cabin installs
- Users who want more protection, control, and monitoring
ALPHA R - SMARTER POWER MANAGEMENT
The BCDC Alpha R is the top tier. It’s the same as the Alpha above, with the added ability to connect to the included Smart battery monitor and other RedVision products for a complete total vehicle management solution.
Best for:
- Vans, hybrids, and newer vehicles
- In-cabin installs
- High-power or occasional heavy loads
- People planning to expand with RedVision products
KEY FACTORS TO CONSIDER
1. Battery Type
REDARC BCDCs work with AGM, Gel, lead acid, calcium, and lithium (LiFePO4).
2. Battery Size & Power Demand
Bigger batteries and more accessories need more charging power. REDARC offers:
- 25 amps (BCDC1225D): Best for fridges, lights, and light use.
- 40 amps (BCDC1240D): For larger batteries or faster charging.
- 50 amps (BCDC1250D, Alpha 50R/50B): For heavy use or large battery banks.
- 100 amps (Alpha 100R): For massive systems with high-demand gear.
Tip: If unsure, go for a higher amp model to allow for future upgrades.
3. Alternator Type
If your vehicle has a smart alternator, you need a BCDC. REDARC chargers are built to work with both traditional and smart alternators, so your battery always charges properly.
4. Mounting Location
BCDCs are built tough, but some models are better suited for certain installs:
- Under the hood: Classic and Alpha B models handle heat, dust, and water.
- Inside cabin/canopy: All BCDC models, including Alpha R, can be mounted here.
BCDC is always recommend being mounted with in 1m (3ft) of the secondary battery. Choose based on where you want to install it and the conditions it will face.
5. Solar Input
Many REDARC BCDCs include an MPPT solar regulator. If you want to charge by solar panels as well as your alternator, pick a “D” model (like BCDC1225D or 1240D) or any Alpha model.
These can automatically switch between solar and alternator input and with REDARC’s Green Power Priority, will always prioritize solar power when available to take the load of your alternator.
SPECIAL CONSIDERATIONS
The Alpha 50R cannot power the RedVision DISP4300-RC display unless paired with a RedVision Rogue or Prime module.
The Alpha 100R includes the R-Bus power supply needed to run the RedVision display directly.
For large lithium setups, REDARC recommends the Alpha range. These stay cooler, handle heavy loads better, and last longer in tough conditions.
FINAL TIPS
Always check your battery manufacturer’s charging specs before choosing a model.
If torn between two sizes, choose the larger amp model for future-proofing.
Adding solar? Pick a BCDC D or Alpha model to maximize free solar power.
FIND YOUR PERFECT BCDC
Still not sure? REDARC’s support team can help you choose the right charger for your vehicle, battery, and setup. Visit the REDARC BCDC page to learn more and see the full range.
