30A 12V DC to 12V DC Advanced Automatic Multi-Stage Battery-to-Battery Charger

This 30A advanced DC-DC Battery Charger is fully automatic and ideal for leisure vehicles, commercial and special purpose vehicles, boats, and any other systems with multiple 12V batteries or power sources. The charger operates using an adjustable three-stage charging programme and is suitable for Lead Acid, AGM, Gel, LiFePO4, and Lithium-ion (NCM) batteries. The product is compact, light-weight and features high frequency switching and buck-boost power conversion technology for reliable, consistent performance.

The charger comes with a powerful built-in MPPT solar charge controller, enhancing its capability with additional charging from solar panels. The unit will charge the target battery from solar panels whenever the DC-to-DC charging is not active. This is useful in applications where the DC-to-DC charging function is not used for significant periods of time, such as when a vehicle is parked or in storage, or when supplementary charging from solar panels is needed. MPPT technology of this charger extracts the energy from solar panels with the maximum efficiency which significantly exceeds efficiency of other non-MPPT chargers. The solar charging function will also provide a trickle charge to the source battery to prevent it from self-discharging.

This charger is equipped with output terminals that allow a fridge to be connected directly to the battery charger. By adjusting the charger's DIP switches, it can be configured to draw power from either the source battery or the target battery, depending on the voltage level of the source battery. If the source battery's voltage drops below 11.9V, the charger will automatically switch to the target battery to ensure continuous power to the fridge.

Key Features

- Fully-automatic, high-frequency, multi-stage charging: ensures the battery is charged safely and quickly. Pulsed charging keeps temperatures low and helps ensure a long battery life.

- Efficient 20A MPPT solar charge controller: the controller specifically pinpoints the maximum power voltage point of the solar panel(s) as it varies depending on sunlight exposure and temperature. This ensures the maximum output from the solar panels and shorter charging times.

- Seamless Fridge Connectivity with Smart Power Switching: Directly connect your fridge to the charger, which intelligently switches between batteries based on voltage levels, ensuring uninterrupted cooling even when the source battery drops below 11.9V.

- Easy battery type selection: with the use of dip switches, the unit can be switched between Lead Acid, AGM, Gel, LiFePO4, or Lithium-ion battery types.

- Safe unattended charging: the unit features inbuilt safety functions (protection against overload, overheating, overvoltage, over-discharge, short circuit, and reverse discharge of the battery), that allow the charger to be left permanently connected to the batteries for unattended automatic charging.

- Source battery voltage control: When enabled, DC-DC charging operates based on the source battery voltage, automatically turning ON and OFF as needed. In this mode, the D+ signal is not required, simplifying installation and operation.

- Advanced temperature protection and compensation: when paired with an optional external temperature sensor (sold separately), the charger provides advanced temperature protection for the batteries. For Lead Acid batteries, the charger adjusts the charging voltage to compensate for ambient temperature, ensuring optimal charging and extending battery life. For Lithium batteries, the temperature sensor unlocks a charging protection to be selected to prevent charging when below 0°C which could damage the battery.

- Data monitoring: the charger includes ports for a remote meter or a Bluetooth module (both sold separately), allowing data to be viewed on an LCD display or through a mobile phone app when connected.

- Continued charging during battery/load use: the charger will continue to operate at full power whilst energy is drawn from the battery during use. Any 12V loads may also be left permanently connected and running whilst the DC-to-DC charger is in operation, and will be protected against overvoltage and voltage fluctuations.

- Ignition on/off control: via connection to the ignition control through the D+ terminal, this charger can be set to begin battery-to-battery charging immediately when vehicle ignition is turned on, and stop charging when the vehicle is turned off.

- Wake - up function for Lithium batteries: when the Battery Management System (BMS) of a lithium battery goes into the protection mode, the charger can automatically activate the BMS and continue charging the lithium battery.

Additional features

A high efficiency built-in MPPT solar charge controller is included in the device to enhance charging capabilities to the target battery from solar panels whenever DC-to-DC charging is not active, such as when the vehicle is parked up or in storage. It will also provide a trickle charge to the starter battery to protect against self-discharge.

This charger can provide a signal for an external relay (not supplied), so that when the target battery is connected to a heavy load, the battery banks can be directly connected to each other, allowing the source battery to assist the target battery in starting high-current electrical loads.

It features optional terminals that enable greater precision in voltage measurement of the target battery by bypassing the voltage drops in heavy-duty charging cables.

It features optional terminals that enable greater precision in voltage measurement of the target battery by bypassing the voltage drops in heavy-duty charging cables.

It features optional terminals that enable greater precision in voltage measurement of the target battery by bypassing the voltage drops in heavy-duty charging cables.

It features optional terminals that enable greater precision in voltage measurement of the target battery by bypassing the voltage drops in heavy-duty charging cables.

It features optional terminals that enable greater precision in voltage measurement of the target battery by bypassing the voltage drops in heavy-duty charging cables.

It features optional terminals that enable greater precision in voltage measurement of the target battery by bypassing the voltage drops in heavy-duty charging cables.

It features optional terminals that enable greater precision in voltage measurement of the target battery by bypassing the voltage drops in heavy-duty charging cables.

The charger includes 6 LED indicators to display the solar charging state, battery charging stage, and diagnostic information.

Compatibility

This DC-to-DC battery charger is suitable for use with 12V lead acid, AGM, Gel, LiFePO4, and Lithium-ion (NCM) batteries. It is not compatible with 24V batteries or a combination of 12V and 24V batteries.

- Specifications
- Source battery voltage: 12V
- Battery input voltage: 10.5V - 16V
- Effective D+ signal voltage range: 8V - 16V
- Maximum charging power: 390W
- Maximum charging current of target battery: 30A
- Maximum solar power input power: 250W
- Maximum solar power input current: 14A
- Maximum solar power open circuit voltage: 50V
- Maximum charging current from solar to target battery: 20A
- Charging current to source battery: 0A - 5A
- Minimum recommended source battery capacity: 70Ah - 100Ah
- Target rated voltage: 12V (Lead acid, AGM, GEL), 12.8V (LiFePO4), 11.1V (Li-ion)
- Target battery capacity: 45Ah - 280Ah
- Target battery operating voltage range: 8V - 16V
- Bulk charge voltage: 14.7V (AGM), 14.3V (GEL) 14.4V (Lead Acid), 13.9-14.6V (LiFePO4), 12.6V (Li-ion)
- Float charge voltage: 13.5V (AGM), 13.8V (GEL) 13.5V (Lead Acid), 13.8V (LiFePO4), 12.5V (Li-ion)
- Maximum fridge output current: 20A
- Temperature compensation: -18mV/°C
- Operating temperature: -20°C to 50°C
- Self-consumption current: 24mA
- Relay signal output: 12V / 1A
- Weight: 1.5 kg
- Dimensions: 265 x 190 x 72 mm

Full details explaining wiring and operations can be found in the user manual supplied with this product (see Documents tab).

- User manual for 30A 12V to 12V battery charger with 20A solar input and 20A fridge output (DC1212-3020FR)