Mastervolt Mac Plus 12/24-30 DC-DC Charger with CZone

Description

The Mastervolt Mac Plus 12/24-30 DC-DC Charger converts a 12V engine or source system into controlled 24V charging for a separate service battery bank. It is designed for boats using smart alternators or start-stop charging systems where direct alternator charging may be too low or inconsistent for a 24V auxiliary bank.

Mastervolt’s 3-step+ charging algorithm supports multiple battery chemistries, including lithium, while engine-running detection helps protect the starter battery from unwanted discharge. Temperature-optimized charging and analog voltage-sense connections compensate for battery conditions and voltage loss in longer cable runs.

The fanless high-frequency design provides quiet operation and efficient 12V-to-24V conversion. Multiple units can be paralleled for higher output, and CZone plus NMEA 2000 compatibility supports integration with modern vessel monitoring systems. For boats that need to charge a 24V house, trolling, or auxiliary bank from a 12V engine electrical system, the Mac Plus 30A provides a connected marine-grade solution. Worth comparing against our other DC-DC battery chargers.