DCDX, 12V 40A High Efficiency DC-DC Battery Charger 4-Stage Smart Charging, Compatible with AGM, Gel, Lead Acid, Calcium & LiFePO4 Batteries

Specifications
Input Voltage (DC‑Battery) 12.5‑16.0 VDC
Solar Input Voltage 16.0‑25.0 VDC
Output / Charging Voltage 14.4‑15.4 V (Stops charging when alternator output or vehicle battery below 12.5V)
Rated DC Output Current 40A Max
Rated Solar Output Current 40A Max
Minimum Start Voltage 2.0V
Bulk Charge Voltage 14.7V(AGM/Gel), 14.4V(Lead Acid), 15.4V(Calcium), 14.4V(LiFePO4)
Absorption Constant‑voltage charging with automatic amperage control
Float Charge Voltage 13.5V (AGM/Gel, Lead‑Acid, Calcium)
Float Charge Current 0‑40A
Suitable Battery Capacity 60‑600Ah
Weight 1.2 kg
Dimensions 307×198×45mm
Battery Types AGM / Gel, Lead Acid, Calcium, Lithium‑ion (LiFePO4)

The DCDX is a 12V 40A high-efficiency DC-DC battery charger, professionally designed for RV, camper van and vehicle modification applications. It adopts a 4-stage smart charging algorithm and supports solar charging function, realizing dual charging from alternator and solar power. It features wide battery compatibility and multiple selectable charging modes to fit different battery types.

  • 12V 40A high output current
  • 4-stage intelligent charging system
  • Supports solar charging function
  • Compatible with AGM/Gel, Lead Acid, Calcium and Lithium batteries
  • Multiple battery mode options: AGM/Gel, Lead Acid, Calcium, and 4 optional modes for LiON batteries
  • 2V startup voltage design for stable charging activation

Applicable Vehicles Self-contained RVs, Type B camper vans, Type C motorhomes, off-road camper conversion projects with large-capacity auxiliary batteries Dual input from vehicle alternator and solar panels. Compatible with AGM/Gel, Lead Acid, Calcium and LiFePO4 batteries

Problems Solved

✅ Satisfy fast-charging demand for large-capacity RV auxiliary batteries. 40A high output. Charge batteries via alternator while driving and solar power when parked, dual power sources ensure stable off-grid power for camping.

✅ 4-stage intelligent charging system with selectable battery profiles, including 4 dedicated lithium battery modes. It follows optimized charging curves to protect cells and extend battery service life.

✅ Low 2.0V startup voltage, works for 60–600Ah large batteries, ideal for long-time off-grid camping.

✅ Starter battery protection: automatically cut off charging when alternator or starter battery voltage falls below 12.5V, preventing starter battery drain and no-start risk.

✅ Built-in solar charging function. No separate solar controller required, reduces parts count, simplifies wiring and lowers RV conversion expenses.

✅ Wide battery compatibility: AGM, Gel, Lead Acid, Calcium and LiFePO4, fits diverse RV power system builds.

✅ Lightweight design at only 1.2kg with compact size and pre-wired cables, easy to wire and mount inside limited RV compartments.

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