The Safetex ST-DCDX20A is a 12V 20-amp DC-to-DC battery charger engineered to intelligently charge your auxiliary or house battery directly from your vehicle's alternator while on the move. Unlike a simple isolator or voltage relay, this unit delivers a true multi-stage charging profile — bulk, absorption, and float — ensuring your secondary battery receives a complete, optimised charge regardless of the state of your alternator output voltage. Built-in MPPT solar input compatibility means you can also feed solar panels directly into the charger, combining engine and solar charging into one compact unit for a smarter, more capable dual-battery system.

Whether you're running a fridge, lighting, and water pump in a caravan, or powering a drawer fridge and communications gear in a 4WD touring setup, the ST-DCDX20A is the ideal solution for Australian travellers who demand reliable off-grid power. It's suited for use with AGM, Gel, Calcium, and Lithium LiFePO4 batteries, making it fully compatible with modern lithium auxiliary setups popular in motorhomes and camper trailers. With IP67-rated waterproofing, reverse polarity protection, and over-temperature safeguards, this charger is built tough enough for corrugated outback tracks, coastal campgrounds, and everything in between.

Key Features

• 20A multi-stage DC-DC charging: bulk, absorption, and float profiles for a complete auxiliary battery charge
• Compatible with AGM, Gel, Calcium, and Lithium LiFePO4 battery types
• Integrated MPPT solar input for combined alternator and solar charging
• IP67-rated waterproof and dustproof housing for harsh Australian conditions
• Built-in protections: reverse polarity, over-voltage, over-current, and over-temperature