40-Amp 12-Volt DC-to-DC Battery Charger

Renogy 40A 12V DC-to-DC Battery Charger – Efficient Power on the Move

Compact. Smart. Built for Off-Grid Living.

Power your next adventure with confidence using the Renogy 40A 12V DC-to-DC Battery Charger—a high-efficiency, dual-input charger designed to safely and reliably charge your house batteries from your vehicle's alternator or solar panels.

Delivering up to 94% conversion efficiency, this DC-to-DC charger maximizes your energy transfer while protecting your battery investment. Whether you're running a camper van, off-road rig, or RV, it ensures optimal power flow for both traditional and smart alternators—no voltage drops, no compromise.

With Bluetooth compatibility, you can monitor your system’s status and charging performance remotely through the Renogy app. It’s the ideal upgrade for van lifers, overlanders, and weekend warriors alike.

Key Features:

• Dual Input Charging – Compatible with alternators and solar input (MPPT sold separately)

• High Efficiency – Up to 94% charging efficiency for fast, effective energy transfer

• Smart Alternator Ready – Works with both traditional and modern smart vehicle alternators

• Bluetooth Monitoring – Use the Renogy BT-2 Module (sold separately) for wireless system tracking

• Multiple Battery Support – Works with Lithium (LiFePO4), AGM, Gel, and Flooded batteries

• Advanced Protection – Built-in safeguards against over-temperature, reverse polarity, short circuits, and over-voltage

Specifications:

• Input Voltage: 8V–16V DC

• Rated Output Current: 40 Amps

• Output Voltage: 13.2V–14.7V (Selectable)

• Charging Efficiency: Up to 94%

• Compatible Battery Types: Lithium (LiFePO4), AGM, Gel, Flooded

• Dimensions: 8.3 x 5.9 x 2.8 in

• Weight: 4.2 lbs

• Cooling: Intelligent fan cooling system

What’s Included:

• [1] Renogy 40A 12V DC-to-DC Battery Charger

• [1] User Manual

• Note: Bluetooth module sold separately

Perfect For:

• Sprinter, Transit, and ProMaster Vans

• RV and Camper Conversions

• Overlanding Rigs

• Off-Grid Solar Charging Systems

✔ FREE Shipping to Lower 48 States
✔ 2-Year Manufacturer Warranty

Take control of your off-grid power—get the Renogy 40A DC-to-DC Charger and experience reliable energy wherever the road leads.