12V 40A DC to DC Charger with MPPT for Solar & Alternator Input – Smart On-Board Battery Charger for RV, Marine, Car – Charge AGM, Lithium, Gel, Flooded Batteries

• RENOGY REGO DC-DC Charger – 40A DC-DC MPPT battery charger offers . The 12v battery charger defaults to DC input priority mode. It will to the alternate charging mode when the input voltage in the primary mode falls below the default voltage. This ensures in charging your battery whether you're on the road or parked
• – – : Solar Charger + Alternator/DC-DC Charger with MPPT Versatile compatibility with LiFePO4, Gel, Flooded, and Sealed Lead Acid batteries. Its adaptive – charging logic ( / / / ) tailors voltage/current for each chemistry, ensuring safe, efficient charging from solar panels, vehicle alternators ( / ), or DC sources. Ideal for RVs, boats, and off-grid systems requiring seamless multi-source power management
• 40A DC-DC Charger with MPPT & Solar Charger: This multi-battery charger delivers for solar, alternator, and battery systems. Safeguarding against reverse polarity, over/under-voltage, and over-temperature, the 12V DC to DC charger ensures reliable operation across all scenarios. Ideal for RVs, marine, and off-grid setups requiring robust solar charging and alternator integration
• – 12V DC to DC Charger 40A: Survives desert heat (113°F) and marine salt spray (-4°F~113°F). DC to DC charger 12V 40 amp delivers idiot-proof safety, auto-shuts off during shorts/reverse connections, while temperature compensation protects lead-acid batteries. Control from anywhere via Bluetooth BT-2 ( ) DC to DC charger 40A. Color-coded cables enable 15-minute installs, and LED indicators glow red for faults—perfect for tight truck beds or beachside relaxation
• – 40A MPPT DC-DC/Solar Charger: RENOGY REGO 12V DC to DC charger with solar integration features and one-touch battery type selection ( / / / ). LED alerts instantly flag errors like reverse polarity or over-voltage. Streamline your power management with this versatile battery charger – designed for effortless RV, marine, and off-grid operation

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1 DC Input Priority 2 Solar Input Priority

1. Specs Recommended

Accs Recommended

1 Specs Recommended 2 Accs Recommended

1 RV 2 SUV 3 Boat

• What type of alternator is this DC to DC on board battery charger compatible with?

  Works with both alternators. But smart alternators vary voltage, so you MUST connect the charger's IGN (ACC) cable to the Vehicle Ignition Port for them to work properly.

• What types of battery does the charger support?

  It's suitable for 12V Lithium, Gel, AGM, and Calcium batteries. This charger enables the batteries to reach a full 100% charge. Additionally, it has the capability to revive lithium batteries that have become discharged to a low voltage.

• How do l set the battery since there is no display screen?

  To change the battery type, press and hold the SELECT button on the side of the battery charger. The LED lights corresponding to each battery type will illuminate in sequence, indicating the available options.

• If both solar power and the engine are available, can we prioritize using solar power to charge the battery?

  Our product defaults to DC charging. To prioritize solar charging, simply press the SELECT button on the side.

• Can solar charging and DC charging be switched automatically?

  Charging automatically switches to solar when:

  1. Generator ON: DC <11.3V & Solar >13V

  2. Generator OFF: DC <12.7V & Solar >13V