12V 30A DC-DC Smart Battery Charger with Bluetooth

Reliable DC-DC Charging for Modern 12V Battery Systems

This 12V 30A DC-DC Smart Charger is designed for dependable charging of auxiliary and house batteries in motorhomes, campervans, boats and off‑grid systems. It supports multiple battery chemistries, including 12V lead-acid (Flooded, Gel, AGM), 12.8V LiFePO4 and 11.1V lithium-ion (NCM), with a recommended capacity range of 45-280Ah. With up to 390W output and a maximum charge current of 30A, it delivers stable, controlled charging from a 12V starter battery or alternator.

The integrated booster function steps voltage up or down (8-16V input range) to maintain the correct charging profile, even with variable alternator output. Fully automatic operation manages bulk, absorption and float stages to help protect battery health and extend service life. An onboard temperature sensor and temperature compensation (-3mV/°C/2V for lead-acid) adjust charging in real time to reduce the risk of overheating and overcharging.

Bluetooth app support (via optional Bluetooth dongle) allows you to monitor voltage, current and charge status from your smartphone, while optional accessories such as the MT‑2 meter and external temperature sensor (TRS) provide additional installation flexibility. Compact dimensions of 215 x 190 x 70 mm and a robust design make it suitable for tight installations in vehicles and marine environments. With a standby current of approximately 30mA and an operating temperature range of -20°C to 50°C, it is well-suited to continuous use in demanding conditions.

Why It's a Smart Choice

• Multi-chemistry support - Optimized charging profiles for lead-acid, AGM, Gel, LiFePO4 and lithium-ion (NCM) batteries from 45-280Ah.
• Stable B2B charging - Boosts or reduces alternator voltage (10.5-16V start battery range) to deliver up to 30A, helping ensure consistent charging on the move.
• Remote monitoring - Bluetooth app compatibility and optional display meter provide clear visibility of system performance and charge status.

FAQ

Q: Which batteries can this charger be used with?
A: It supports 12V lead-acid (Flooded, Gel, AGM), 12.8V LiFePO4 and 11.1V lithium-ion (NCM) batteries, typically between 45Ah and 280Ah. The starter battery is expected to be a 12V lead-acid type around 60Ah or higher.

Q: Can it charge a house battery from my vehicle alternator while driving?
A: Yes. In B2B (battery-to-battery) mode, it takes power from the 12V starter battery/alternator (10.5-16V input) and automatically boosts or reduces voltage to follow the correct charging curve for the main battery.

Q: Do I need the Bluetooth dongle for it to work?
A: No. The charger operates fully automatically without Bluetooth. The optional Bluetooth dongle simply adds app-based monitoring and configuration where supported.

Q: Is it suitable for use in campervans and boats?
A: Yes. It is specifically designed for motorhomes, campers, boats and similar 12V systems where a reliable DC‑DC charger is required between the starter and auxiliary batteries.

Q: What are the physical dimensions and operating conditions?
A: The charger measures approximately 215 x 190 x 70 mm, operates from -20°C to 50°C, and draws about 30mA in standby mode.