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12V 40A DC to DC Battery Charger MPPT System Kit Isolator Dual Battery

12V 40A DC to DC Battery Charger MPPT System Kit Isolator Dual Battery

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12V 40A DC to DC Battery Charger MPPT System Kit Isolator Dual Battery


If you’re planning off-grid camping, a DC-DC charger by ATEM POWER will be your perfect companion for a dual battery setup when you cannot access the main power. This device, which is designed to do a full charge cycle with the ability to choose either Lead Acid, AGM, Gel, calcium, or LiFePO4 batteries and apply the suitable charging profile to prolong their lifespan, also incorporates a Re-selection Ready mechanism that allows you to re-select the battery during charging by long pressing “POWER”. And it can be connected indefinitely when you’re all set up! This ATEM POWER DC-DC charger is also a fully multi-input charger that is able to charge from either an alternator to get the best possible rate of flow into your secondary battery and keep it up on the drive or via solar power with the built-in MPPT controller for faster charging and reducing the load on your engine! And multiple protections are integrated to keep the battery safe, especially in case of accidental terminal misconnection.

12V 40A DC to DC Battery Charger MPPT System Kit Isolator Dual Battery

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12V 40A DC to DC Battery Charger MPPT System Kit Isolator Dual Battery

Dual Input: This Charger is designed to effectively pull power from solar panels (up to 40A) or the vehicle’s alternator to charge your auxiliary battery.
Multi-Stage Charging: This charger integrates standby, pre-charge, constant current charging, constant voltage charging, full charge, and re-charge.
Multi Battery Selection: This DC-to-DC charger by ATEM POWER is compatible with Lead Acid, AGM, Gel, calcium, and LiFePO4 batteries.
Built-In MPPT Regulator: The regulator is designed to harvest up more energy from the solar panel.
Multiple Protection: It integrates over-charge, short circuit, over-temperature, thermal load, solar input overload, and input/output reverse polarity protection.
Internal Temperature Monitoring: This mechanism can effectively protect the circuit board, thus prolonging the lifespan of the charger.
Sturdy Construction: Sturdy aluminum housing is built to resist harsh conditions and quality wires are built for long last durability.
Upgraded Charging Algorithm: This algorithm is designed to select the optimum charge mode and revive your discharged battery.
Smart Alternator Compatible: The ACC wire can be wired to the ignition to adjust voltage cut-off, which is suitable for modern vehicles, trailers, and caravans.
User-Friendly Design: The LED indicator shows the real-time stage of charging and the memory function is integrated to make your charging more convenient.
Please note: always refer to the wiring diagram in this listing for the latest wiring setup of the product as the user manual might be for the previous version.

12V 40A DC to DC Battery Charger MPPT System Kit Isolator Dual Battery Specification:

Max. Battery Input Voltage: 24V
Min. Solar Input Voltage:


Max. Solar Input Current: 40A
Max. Solar Input Voltage: 26V
Max. Output Current: 40A
DC Input Voltage: 12V(ACC ON),11.3V (ACC OFF),MAX 24V
Rated Charging Current: 40A MAX (IN/OUT)
Charging Voltage Range: 7~15.4V
Operational Temperature (Ambient): -20℃~45℃
Humidity: 0%~90%
Soft Start: YES
Soft Charge Current: 4A
Bulk Charge Voltage: 12V
Package Size: 28.7x19.5x6.5cm
Gross Weight: 1.46kg


What is MPPT technology in a DC to DC Battery Charger?

MPPT (Maximum Power Point Tracking) technology is used in DC to DC Battery Chargers to maximize the power harvested from the input source, such as solar panels or alternators. It intelligently adjusts the voltage and current to ensure the optimal power transfer to the batteries.

How does a 12V 40A DC to DC Battery Charger work?

The 12V 40A DC to DC Battery Charger takes the input DC voltage from the primary battery or power source and converts it to the desired output voltage for charging the secondary battery. It regulates the charging process, monitors battery conditions, and ensures efficient power transfer.

What is the purpose of a dual battery system?

A dual battery system is commonly used in vehicles, boats, RVs, or other off-grid setups to separate the power needs of different systems. It allows for independent charging and discharging of two batteries, typically a primary starting battery and a secondary auxiliary battery.