Baintech BT-1224-15A Marine DC-DC Battery Charger – 12V Output 15A

Baintech BT-1224-15A delivers high-current DC-DC charging for 12V lithium auxiliary batteries in dual battery systems, marine house banks and off-grid power installations.

This 15A charger accepts 10-36VDC input from alternators, solar controllers or primary battery banks, converting it to precise output optimized for LiFePO4 and LiMn2O4 chemistry. The waterproof, dust-proof and shockproof marine-grade enclosure withstands engine room heat, salt spray and constant vibration that destroys standard DC-DC chargers. Intelligent CC/CV charging eliminates the float stage that degrades lithium batteries, automatically terminating at 10% current when full charge voltage is reached.

Designed for Australian marine and 4WD environments where larger lithium auxiliary batteries (100-300Ah) require faster charging during limited engine run times. The wide 10-36VDC input range accepts voltage from 12V and 24V vehicle electrical systems, along with fluctuating alternator output during operation. C400L series technology achieves 96% efficiency, minimizing heat generation while maximizing the 15A charge delivery critical for replenishing house bank capacity during short transit periods between anchorages.

Key Specifications

• Rated output: 12V DC, 15A (600W maximum)
• Input voltage range: 10-36VDC (multi-voltage compatibility)
• Battery chemistry: LiFePO4 and LiMn2O4 lithium batteries
• Charging profile: CC/CV (Constant Current/Constant Voltage)
• CC cutoff voltage: 14.6V (LiFePO4), 12.6V (LiMn2O4 3-series)
• Charging efficiency: Up to 96%
• Environmental protection: Waterproof, dust-proof, shockproof (marine grade)
• Safety certifications: CE, RoHS, ISO9001-2015
• Protection features: Over-voltage, over-temperature, over-current, short circuit

Features & Benefits

High-Current 15A Output: Delivers 50% more charging current than 10A models, reducing charge times for larger auxiliary battery banks. Critical for marine applications where engine run time is limited and house bank capacity (150-300Ah) must be replenished quickly between anchorages.

Multi-Voltage Input Range: 10-36VDC input accepts charging sources from 12V vehicle electrical systems, 24V truck/bus systems, solar charge controllers and generator output. Single charger handles multiple installation scenarios without voltage-specific variants.

Lithium-Specific Charging Algorithm: Delivers precise 14.6V cutoff for LiFePO4 or 12.6V for LiMn2O4 chemistry, eliminating the float charge stage that causes lithium battery degradation. Prevents overcharge damage and thermal runaway risks from using lead-acid DC-DC chargers on lithium auxiliaries.

Marine-Grade Environmental Protection: Waterproof, dust-proof and shockproof construction withstands engine room spray, bilge water exposure and constant vibration. Operates reliably in conditions that cause standard DC-DC chargers to fail within months of marine installation.

High-Efficiency Conversion: 96% efficiency reduces wasted power and heat generation during the high-current charging cycle. Critical for confined engine rooms and battery boxes where 15A charging produces significant heat that must be managed without active cooling.

Intelligent Charge Termination: Automatically reduces charge current to 10% upon reaching full charge voltage, then terminates without float charging. Maximizes lithium battery cycle life by preventing the continuous low-level charging that shortens lithium cell lifespan in always-connected dual battery systems.

Technical Specs

• Model: BT-1224-15A
• Series: C400L
• Rated output voltage: 12V DC
• Rated output current: 15A
• Maximum output power: 600W (15A x 12V = 180W nominal, up to 600W during bulk charge phase)
• Input voltage range: 10-36VDC
• Battery chemistry compatibility: LiFePO4, LiMn2O4
• Charging method: CC/CV (Constant Current/Constant Voltage)
• CC cutoff voltage (LiFePO4): 14.6V
• CC cutoff voltage (LiMn2O4 3-series): 12.6V
• Charge termination: 10% current reduction at full voltage
• Float charging: None (lithium-optimized)
• Conversion efficiency: Up to 96%
• Technology: Advanced switching mode power supply
• Environmental protection: Waterproof, dust-proof, shockproof
• Over-voltage protection: Yes
• Over-temperature protection: Yes
• Over-current protection: Yes (CC mode)
• Short circuit protection: Yes
• Output terminal type: Universal battery system compatibility
• Certifications: CE, RoHS, ISO9001-2015

Compatible With / Goes Well With

• 12V LiFePO4 auxiliary battery systems (100Ah-300Ah optimal range)
• 12V LiMn2O4 lithium house banks (marine applications)
• High-capacity dual battery systems (vehicle primary to lithium auxiliary)
• Marine electrical systems with lithium house banks (150Ah+)
• 4WD and caravan lithium battery upgrades (larger capacity installations)
• Solar charge controller integration (10-36VDC output)
• 24V truck/bus systems charging 12V auxiliary batteries
• Off-grid power systems requiring fast charge capability

Caution: Output is 12V only. This charger cannot charge 24V or 36V auxiliary battery systems. Verify your auxiliary battery voltage and alternator capacity before connection.

How much faster does 15A charge compared to 10A models?

Approximately 50% faster for the same battery capacity. A 150Ah lithium auxiliary battery requires about 10-12 hours with 10A charging versus 7-8 hours with 15A, accounting for charge curve tapering and efficiency.

Can my alternator handle the 15A draw from this charger?

Most modern 12V alternators (80A+) handle 15A auxiliary charging without issues. The charger draws progressively as alternator output stabilizes, typically pulling 18-20A from the primary battery during peak charge. Verify your alternator capacity before installation.

Will this work in a 24V truck dual battery system?

Yes, the 10-36VDC input range covers 24V vehicle electrical systems (typically 27-28V during alternator charging). The charger outputs regulated 12V to charge a 12V auxiliary lithium battery from the 24V primary system.

Is this suitable for below-deck marine installations?

Yes, the waterproof, dust-proof and shockproof construction is specifically designed for harsh marine environments including engine rooms and below-deck battery compartments exposed to spray and humidity.

Does the higher current create more heat in confined spaces?

The 96% efficiency minimizes heat generation, but 15A charging produces more thermal output than 10A models. Ensure adequate ventilation in battery compartments and avoid mounting directly against flammable materials. The over-temperature protection will reduce output if thermal limits are reached.