Mastervolt 81205400 Mac Plus 24/24-30 DC-DC Charger

Mastervolt Mac Plus 24/24-30 DC-DC Battery Charger & Power Supply

The Mastervolt Mac Plus 24/24-30 (Part Number: 81205400) is a heavy-duty, high-efficiency 24V to 24V 30A DC-DC battery charger and regulated power supply. Engineered for marine, commercial vessel, and specialty vehicle power systems, it resolves charging issues caused by long cable voltage drops or variable-voltage "smart" alternators (Euro 5/Euro 6 compliance).

Utilizing a 3-step+ charging algorithm, the Mac Plus safely charges and protects Flooded, Gel, AGM, and Lithium-Ion (LiFePO4) service batteries directly from a primary 24V DC battery bank or alternator. Its fanless, natural-convection cooling design ensures completely silent operation, while its IP23-rated die-cast aluminum housing and ignition-protected enclosure (SAE J1171) enable safe mounting in engine compartments. Up to 10 units can be operated in parallel to yield over 300A of continuous charge capacity. Fully networkable, it seamlessly integrates with MasterBus, CZone, and NMEA 2000 control networks. 

Key Features

• 3-Step+ Dynamic Charge Algorithm: Maximizes battery health with tailored bulk, absorption, and float phases for Lead-Acid, AGM, Gel, and LiFePO4 batteries.

• Fanless Thermal Management: Operates in total silence without moving parts, improving reliability in dirty or high-moisture environments.

• Smart Alternator & Engine Run Detection: Automatically detects engine operation to prevent unintended discharge of the engine starter battery.

• Dual Functionality (Charger or Power Supply): Operates as a multi-stage battery charger or as a stable, regulated 24V DC power supply (20-30V range).

• Full Network Control: Native MasterBus, CZone, and NMEA 2000 compatibility provides remote monitoring, full system integration, and digital switching control.

• Heavy-Duty M8 Screw Terminals: Robust direct stud connection ports reduce resistance and prevent wire loosening under high vibration.

Specifications