Renogy 30A DC-DC MPPT Battery Charger 12V — Dual-Input Onboard Charger with Multi‑Chemistry Support

Whether you convert a van, outfit an RV, or maintain a marine dual-battery setup, the Renogy Smart 30A DC-DC MPPT charger gives you flexible, multi-stage charging and built-in protections in a space-saving package. It accepts both alternator (starting battery) input and solar input simultaneously, uses MPPT to extract the most energy from solar panels, and supports Flooded, Gel, AGM and Lithium battery chemistries. The unit also includes communications options for real-time monitoring when paired with Renogy accessories.

How does this charger manage charging from both alternator and solar simultaneously?

The Renogy 30A DC-DC charger intelligently handles two power sources at once. When both the alternator and solar are available, the charger prioritizes solar to maximize renewable input, while still allowing alternator power to contribute when needed.

• Prioritizes solar MPPT input when both sources are active
• Combines inputs to maintain service battery voltage and state of charge
• Automatically switches charge stages (Bulk, Boost, Float)
• Helps reduce fuel consumption by using more solar energy

What battery types and charging profiles are supported?

This charger offers multi-chemistry presets and a three-stage charging profile to safely bring different battery types to full charge. You can select or program settings appropriate for Flooded, Gel, AGM, and Lithium (LiFePO4) batteries to ensure correct voltages and absorption times.

• Three-stage charging: Bulk, Boost/Absorption, Float
• Presets for Flooded, Gel, AGM, and Lithium chemistries
• Prevents overcharging with precise voltage regulation
• Adaptable to varying battery capacities and states of charge

What protections and durability features does it include for vehicle or marine use?

The Renogy charger is built for rugged installations and includes a suite of safety features. Protections cover over-voltage, over-current, temperature, reverse polarity, reverse current, and isolation, making it suitable for rough environments on road or water.

• Isolation and reverse-polarity protection for safe connections
• Over-voltage/current and thermal protections to prevent damage
• Designed to work with traditional and smart alternators
• Compact, lightweight housing fits tight mounting locations

How can I monitor and control the charger remotely?

The unit features an RJ45/RS485 communication port compatible with Renogy screens and the DC Home App. Adding the optional BT-2 Bluetooth module unlocks wireless monitoring and control through your phone, showing voltage, temperature and fault codes in real time.

• RS485 output for Renogy One and RMS-DCDC displays
• BT-2 Bluetooth module (sold separately) for phone monitoring
• Real-time tracking of voltage, temperature, and faults
• Recommended ANL fuse (40A) to protect wiring and components

Who is this for: If you need a compact, reliable DC-to-DC charger for vanlife, RVing, boating or off-grid day use where space is tight and power sources vary, the Renogy Smart 30A DC-DC MPPT charger is built to manage dual inputs, multiple battery types, and remote monitoring. It suits installers and DIYers looking for MPPT efficiency, robust safety features, and a small footprint for confined installations.