30A 12V→12V Advanced DC-DC Battery Charger with 20A MPPT Solar Input The DC1212-3020 is an advanced dual-input DC-DC charger designed for vehicles, boats and off-grid systems requiring reliable charging from both alternator and solar sources. Delivering up to 30A from a 12V starter battery and a further 20A from its integrated MPPT solar controller, it provides efficient, intelligent charging for a wide range of battery types — including Lead Acid, AGM, Gel, LiFePO4, and Lithium-ion (NCM). Compact and lightweight, this high-frequency charger uses buck-boost conversion to maintain consistent output even when supply voltage fluctuates. Its intelligent three-stage charging program automatically adjusts to the selected battery chemistry for safe, unattended operation. Whether fitted in a campervan, motorhome, commercial vehicle or boat, the DC1212-3020 ensures fast, complete and controlled charging every time. Key Features Dual charging capability: charges from alternator or solar, switching automatically between inputs for maximum efficiency. Integrated 20A MPPT solar controller: extracts maximum power from solar panels (up to 250W, 50V Voc), with trickle charge to maintain the starter battery. Intelligent three-stage charging: optimised for Lead Acid, AGM, Gel, LiFePO4 and Lithium-ion (NCM) batteries, ensuring safe and complete charging. Temperature management: supports an optional external sensor for automatic voltage compensation (lead-acid) and low-temperature charge inhibit (lithium). Data monitoring: compatible with optional Bluetooth module or remote LCD meter for real-time charging data. Ignition or voltage sensing control: automatic start/stop charging with engine on/off via D+ terminal or voltage detection. Continued charging under load: maintains charge while 12V appliances remain in use; full protection against voltage fluctuation. Wake-up function for lithium BMS: automatically reactivates a battery that has entered protection mode. Relay signal output: allows battery banks to be linked under heavy load so the source battery can assist the target battery. Precision sense terminals: optional terminals for accurate voltage sensing and compensation for cable drop. LED indicators: display solar charging status, charging stage, and diagnostic information at a glance. Technical Specifications Source battery voltage 12V Input voltage range 10.5 – 16V Effective D+ signal range 8 – 16V Maximum charging current (target) 30A Maximum charging power 390W Maximum solar input power 250W Maximum solar input current 14A Solar open-circuit voltage (Voc) 50V Charging current from solar to target battery 20A Trickle charge to source battery 0 – 5A Recommended source battery capacity ≥ 60Ah Target rated voltage 12V (Lead Acid, AGM, Gel), 12.8V (LiFePO4), 11.1V (Li-ion) Target battery capacity 45 – 280Ah Bulk voltage 14.7V (AGM), 14.3V (Gel), 14.4V (Lead Acid), 13.9–14.6V (LiFePO4), 12.6V (Li-ion) Float voltage 13.5V (AGM), 13.8V (Gel), 13.5V (Lead Acid), 13.8V (LiFePO4), 12.5V (Li-ion) Temperature compensation −3 mV / °C / 2 V (Lead-acid only) Operating temperature −20 °C to +50 °C Self-consumption 17 mA Relay signal output 12 V / 1 A Dimensions (L × W × H) 190 × 194 × 70 mm Weight 1.44 kg Warranty 1 year Compatibility & Installation Suitable for 12V electrical systems only. Works with all common 12V battery types and alternator systems. Not compatible with 24V systems or mixed 12V/24V setups. Install using appropriately sized cables and fuses in a ventilated location. Optional accessories — including Bluetooth module, remote meter, and temperature sensor — allow flexible monitoring and control in vehicle, marine or off-grid environments. Documents Available Installation and user guide available for download.
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