12V 20A DC-DC Battery Charger for RV, Van, Boat, Off-Grid | Lithium & Lead-Acid Batteries

Features

• 20A DC-DC Charging: Delivers up to 20A charging current from a 12V vehicle electrical system to the auxiliary battery.
  
• Multi-Battery Ready: Compatible with 12V AGM, Flooded, Gel, and Lithium batteries with selectable charging modes.
  
• Smart & Traditional Alternator Compatible: Works with both smart and conventional alternators for reliable charging.
  
• 2-Stage & 3-Stage Charging: Uses 2-stage charging for lithium and 3-stage charging for lead-acid batteries to maximize charging performance.
  
• Battery Isolation Protection: Prevents reverse current between the starter and auxiliary batteries.
  
• Comprehensive Circuit Protection: Protects against over-voltage, over-temperature, and reverse polarity.
  
• D+ Ignition Control: Charges only when the engine is running to help protect the starter battery.
  
• Temperature-Adaptive Charging: Supports an optional RJ11 temperature sensor for automatic charging compensation on lead-acid batteries.

Specifications

Input

• Nominal Input Voltage: 12V DC
  
• Operating Voltage Range: 10–16V DC
  
• Input current limiting: ≤34A

Output

• Rated Output Power: 250W
  
• Rated Output Current: 20A
  
• Operating Current Range: 18–22A
  
• Battery Compatibility: AGM, Flooded, Gel, Sealed, LiFePO₄ (LFP), Lithium-ion

General

• Charging Mode: 2-Stage (Lithium) / 3-Stage (Lead-Acid)
  
• Peak Efficiency: >85% (@14V DC, 30% Load)
  
• Net Weight: 4.0 lb
  
• Dimensions: 8.4 × 7.4 × 3.1 in
  
• Certifications: CE, RoHS
  
• Package Dimensions: 11 × 9 × 5 in
  
• Gross Weight: 5 lb