30A 12V→12V Advanced DC-DC Battery Charger with 20A MPPT Solar Input
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.