Baintech BT-1212-30A Marine DC-DC Battery Charger – 12V Output 30A

This 30A 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, while LED status indicators provide instant charging state feedback. 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 expedition 4WD environments where large lithium house banks (200-500Ah) require rapid 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. C400L series technology achieves 96% efficiency while natural cooling eliminates fan noise and mechanical failure points. The compact, lightweight design fits tight engine room spaces while the 2-year warranty provides confidence for critical electrical system installations.

Key Specifications

• Rated output: 12V DC, 30A (maximum 440W)
• 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)
• Cooling method: Natural convection (fanless design)
• Status indicator: LED charging state display
• Warranty: 2 years limited warranty
• Safety certifications: CE, RoHS, ISO9001-2015
• Protection features: Over-voltage, over-temperature, over-current, short circuit

Features & Benefits

Professional 30A Output: Delivers double the charging current of 15A models, dramatically reducing charge times for large auxiliary battery banks. Essential for marine liveaboard setups and expedition vehicles where 200-500Ah lithium house banks must be replenished quickly during short engine run times between anchorages or remote campsites.

LED Charging State Indicator: Visual feedback shows charging status at a glance without requiring external monitoring equipment. Critical for confirming charge initiation after engine start and monitoring charge completion in remote installations where battery monitors aren't fitted.

Natural Convection Cooling: Fanless design eliminates mechanical failure points and noise pollution in living spaces. The compact, lightweight construction dissipates heat through the marine-grade enclosure without requiring forced air cooling that draws dust and moisture into electronics.

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.

2-Year Warranty Coverage: Manufacturer-backed warranty provides confidence for critical electrical system installations where charger failure could strand vessels or vehicles in remote locations.

Technical Specs

• Model: BT-1212-30A
• Series: C400L
• Rated output voltage: 12V DC
• Rated output current: 30A
• Maximum output power: 440W (30A x 14.6V during bulk charge)
• 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
• Cooling system: Natural convection (fanless)
• Status indicator: LED display showing charging state
• 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
• Warranty period: 2 years limited warranty

Compatible With / Goes Well With

• 12V LiFePO4 auxiliary battery systems (200Ah-500Ah optimal range)
• 12V LiMn2O4 lithium house banks (large marine installations)
• High-capacity dual battery systems (expedition vehicles)
• Marine electrical systems with lithium house banks (200Ah+)
• 4WD and expedition caravan lithium battery systems
• Solar charge controller integration (10-36VDC output)
• 24V truck/commercial vehicle systems charging 12V auxiliaries
• Off-grid power systems requiring rapid charge capability
• High-output alternators (100A+ recommended)

Caution: Output is 12V only. This charger cannot charge 24V or 36V auxiliary battery systems. Verify your auxiliary battery voltage and alternator capacity (minimum 100A recommended) before connection.

Frequently Asked Questions

Can my alternator handle the 30A charging current?

You'll need a minimum 100A alternator for reliable 30A auxiliary charging. The charger draws approximately 35-40A from the primary battery during peak charge, so verify your alternator has sufficient capacity beyond vehicle electrical loads before installation.

How much faster is 30A compared to 15A charging?

Approximately twice as fast for the same battery capacity. A 200Ah lithium auxiliary battery requires about 14-16 hours with 15A charging versus 7-8 hours with 30A, accounting for charge curve tapering and efficiency.

Will 30A charging generate excessive heat in engine rooms?

The 96% efficiency and natural convection cooling manage heat effectively, but 30A charging produces significant thermal output. Ensure adequate ventilation around the charger and avoid mounting in sealed compartments. The over-temperature protection will reduce output if thermal limits are reached.

Does this work with 24V truck electrical systems?

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.

What do the LED indicators show?

The LED display indicates charging state, though specific colour codes or patterns are not detailed in the supplied documentation. Contact F.A.E. for LED indicator interpretation guide specific to this model.