DC-DC 12V 25-30A Charger

The DC-DC 12V 30A charger is designed for the correct and safe charging of an auxiliary battery from a car, yacht, or trailer alternator. It delivers a stable current of up to 30 A and supports all major 12-volt battery types—lead-acid, AGM/GEL, LiFePO4, and Li-ion. The charger provides a precise charging profile and extends battery life under all conditions.

Supports all battery types

A convenient battery type selection switch is located on the charger housing. The charger automatically sets the correct voltage for the selected mode for:

lead-acid batteries (SLA),

AGM/GEL batteries,

LiFePO4,

Li-ion batteries.

A budget alternative to expensive brands

These devices have earned a good reputation and are among the best offers in the budget segment. They confidently compete with Victron Energy, Renogy, and Sterling Power, offering similar features at 2-5 times the price.

Advantages of DC-DC charging over a direct connection to the generator:

Precise charging voltage—the battery is charged correctly and to 100% capacity.

Current limitation to 30 A—protects the generator, wiring, and the battery itself.

Charging process monitoring—when using additional accessories.

Stable operation even during voltage drops in the vehicle's electrical system.

Compared to a direct connection of an additional battery to the generator, a DC-DC charger ensures correct operation and completely eliminates the risk of overcharging or damage to the battery.

Advanced monitoring capabilities:

Bluetooth module—allows you to monitor voltage, current, and charge status via a phone app.

The Bluetooth module complements the device's functionality, while the charger itself is fully functional and safe, and does not require a Bluetooth module for operation; the latter is only needed for convenient monitoring of the charging process.

Activation via the D+ terminal

For the charger to operate, the D+ terminal must be activated—it signals that the engine is running. This can be accomplished by:

supplying +12V from the ignition circuit;

using a smart relay that automatically shuts off charging when the engine is off.

This protects the starter battery from discharging while parked.

The 12V 30A DC-DC charger is an affordable, reliable, and well-designed solution for motorhomes, yachts, campers, and trailers that require stable charging of an additional battery with the correct parameters.

INSTRUCTIONS for connection