30Amp 12V DC Charger – Smart DC-DC Battery Charger for Caravans, Motorhomes & Boats

The 30Amp 12V DC Charger from RV & Marine Supplies is the smart heart of any dual-battery setup. Built for caravans, motorhomes, and boats, it delivers true 12V-to-12V charging that keeps your auxiliary battery topped up without compromising your starter battery’s ability to start the vehicle. This microprocessor-controlled charger replaces overstressed VSRs with precise, battery-aware boosting for real-world reliability.

• 3-Stage Smart Charging: BOOST, ABSORPTION, FLOAT modes work together to charge faster while protecting battery health and extending usable life.
• Battery Chemistry Memory: One-handed selection for Gel, Calcium, or Lead Acid/AGM, with the charger remembering your choice until you change it again.
• Long-Cable Voltage Compensation: Actively boosts the auxiliary supply so distance between the engine bay and habitation battery doesn’t rob you of charge.
• Main Battery Protection: Microprocessor safeguards the starter battery, keeping it above critical voltage so you can start reliably.
• VSR-Compatible Upgrade: Retains the convenience of traditional split-charging while delivering true smart charging to avoid voltage drops and chemistry mismatches.
• Technical Snapshot: Model PTCD12V30A; Input 12.8–16 VDC; Output 30 A; Absorption and Float voltages adjust by battery chemistry (Gel, Calcium, Lead Acid/AGM); Soft Start and Automatic Equalisation.
• Auxiliary Battery Range: Suitable for 36–600 Ah auxiliary batteries (300–800 CCA for automotive).

Whether you’re running lighting, a fridge, water pump, or an inverter away from shore power, this charger keeps the habitation battery properly charged without draining the engine battery. It’s ideal for caravans and motorhomes with long cable runs, and for boats where reliable auxiliary charging is crucial to keep systems ready while you’re on the water. The system is designed for easy, “set it and forget it” operation across common chemistries, helping you avoid mischarging and last-minute battery failures.