Mastervolt ChargeMaster 12/70-3 Marine Battery Charger – 12V, 70 Amp, 3 Battery Outlets

Description

TheMastervolt ChargeMaster 12/70-3 Marine Battery Chargeris an AC-powered charger that provides up to 70 amps of 12V DC charging output across three isolated battery-bank connections. It accepts 90V to 265V AC input and is specified for high-capacity 12V house battery systems on boats.

The 3-Stage+ smart charging program lists 14.25V absorption and 13.25V float values. It supports AGM, gel, flooded, and Li-ion batteries. A temperature sensor is included, MasterBus Ready communication supports compatible system monitoring, and a variable-speed internal fan manages heat. The charger is IP23 rated and ignition protected.

Key Specifications of the Mastervolt ChargeMaster 12/70-3 Charger

• 70-amp output supports listed high-capacity 12V house battery systems.
• Three isolated banks allow one charger to connect to up to three separate 12V battery banks.
• 12V DC output matches the listed destination battery-system voltage.
• 90V to 265V AC input supports compatible shore, generator, or other AC power sources.
• AGM, gel, flooded, and Li-ion batteries are the listed compatible battery types.
• 3-Stage+ smart charging manages the listed charging sequence.
• 14.25V absorption is the listed higher-voltage charging stage.
• 13.25V float is the listed maintenance charging stage.
• MasterBus Ready communication supports the listed monitoring-system connection.
• A variable-speed internal fan manages operating heat during charging.

Battery and Charging Compatibility

The Mastervolt ChargeMaster 12/70-3 is listed for AGM, gel, flooded, and Li-ion batteries in 12V systems. Its three isolated outputs allow one AC charger to charge up to three separate 12V battery banks.

For example, it can be used in a system with separate house, engine-start, and auxiliary 12V batteries, provided that each connected battery bank and selected charge setting are compatible. Confirm the correct charge profile, especially for lithium batteries, before charging.

Installation and System Considerations

The charger accepts 90V to 265V AC input and provides up to 70 amps at 12V DC across three isolated banks. It has IP23 protection, ignition protection, MasterBus Ready communication, an included temperature sensor, and a variable-speed internal fan. Short-circuit and over-voltage protections are listed. The unit measures 14.3 in. by 9.1 in. by 5.1 in. and weighs 15.4 lbs. Installation should follow the charger manual and the electrical requirements applicable to the vessel.

Warranty and Support

Warranty information is not included in the listed product data. Review the manufacturer documentation for product details, setup, and warranty coverage.

Before Ordering the Mastervolt ChargeMaster 12/70-3 Charger

Before ordering, confirm that your system uses 12V DC battery banks, has up to three separate banks to charge, and uses AGM, gel, flooded, or Li-ion batteries. Confirm that your available AC source falls within the listed 90V to 265V range. Review the 70-amp output, charging voltages, IP23 rating, ignition protection, MasterBus capability, dimensions, and installation space before purchase.