Overview

The Rich Solar 12V 20A DC-DC Battery Charger (RS-DC20) is an intelligent onboard alternator-to-battery charging system engineered for multi-battery off-grid configurations. By combining a battery isolator and a multi-stage battery charger, this unit utilizes your vehicle's engine alternator to safely and optimally top off auxiliary battery banks while driving. Compatible with a wide array of battery chemistries, it serves as the ultimate secondary power hub for recreational vehicles, converted vans, overland rigs, and marine vessels.

Key Features

  • Multi-Chemistry Compatibility: Supports precise multi-stage profiles for 12V AGM, Flooded, Gel, and Lithium (LiFePO4) secondary batteries via an integrated Mode Selection Switch.
  • Alternator Optimization: Integrates seamlessly with both traditional and smart alternators through deep integration with your vehicle's 12V starting system.
  • Adaptive Lithium Management: Implements a safe 2-stage charging profile explicitly engineered to wake up, jumpstart, and fully charge over-discharged or protected Lithium battery management systems (BMS).
  • Advanced Multi-Stage Charging: Tailors an optimized 3-stage charging logic (Bulk, Absorption, Float) for lead-acid cells to guarantee 100% saturation and extend battery lifespan.
  • Engine-Safe Operational Isolation: Features a dedicated D+ ignition sensor terminal that restricts secondary charging strictly to when the engine is running, fully eliminating starter battery depletion.
  • Low-Current Protection Mode: Employs a low-current (LC) wiring loop that safely scales output down to 10A to defend small, sensitive alternators or weaker input wiring runs from overload.

Applications

  • Onboard auxiliary battery replenishment for converted sprinters, campers, and overlanding rigs.
  • Secondary house battery isolation and power tracking on marine vessels, fishing boats, and commercial yachts.
  • Integrated charging coordination for off-grid workspace utility bodies and remote mobile workshops.

Industries & Use Cases

  • Van Life & Overlanding: Ensuring auxiliary power systems recharge securely from engine power during transient trail commutes.
  • Fleet Communications: Maintaining stable utility and communications battery bank levels in commercial fleet field service rigs.
  • Marine Electronics: Isolating delicate auxiliary equipment battery arrays securely from essential starting circuits.

Technical Specifications

Model No. RS-DC20
Input Nominal Voltage 12V DC
Operating Voltage Range 10V – 16V DC
Output Nominal Current 20A
Output Nominal Power 250W
Input Current Limit ≤34A
Low Current Mode Configuration 10A
Efficiency Performance >85% (@14VDC, 30% load)
Lead-Acid Charging Output 3-Stage (Bulk, Absorption, Float)
Lithium Charging Output 2-Stage (Adaptive Activation)
Quiescent Current Draw <0.45A
Weight 4.0 lbs / 1.8 kg
Physical Dimensions 8.4 × 7.4 × 3.1 in

What's Included in the Box

The following premium components are included with your purchase of the RS-DC20 charger to ensure a complete and reliable installation:

  • Rich Solar 12V 20A DC-DC Battery Charger: The core multi-stage intelligent charging and battery isolation unit.
  • Battery Temperature Sensor Cable: Connects directly to the charger's RJ11 port to provide smart, real-time temperature-adaptive charging adjustments.
  • IGN Signal Wire (D+ Ignition Cable): Essential for triggering engine running detection, ensuring your auxiliary system recharges efficiently without drawing down your starting battery.

B2B Add-On

For system designers and custom upfitters, the Rich Solar RS-DC20 provides the granular safety overrides required for complex commercial field builds. Built-in circuit intelligence actively guards systems against over-voltage, reverse polarity, and over-temperature emergencies. Furthermore, a dedicated RJ11 sensor terminal port enables smart temperature-adaptive charging adjustments inside fluctuating hot/cold environments, delivering an added tier of battery longevity tracking essential for multi-vehicle utility operations.