ChargeMaster 25 Amp Battery Charger — Mastervolt

The ChargeMaster 25 Amp Battery Charger from Mastervolt delivers dependable, automated power for boats, caravans, and remote installations. With a 12 V nominal output and a total charge current of 25 A spread across three battery outlets, it keeps house batteries, starters, and thrusters ready when you need them most.

Smart, battery-friendly charging that lasts

Powered by Mastervolt’s distinctive 3-step+ charging process, the ChargeMaster optimizes bulk, absorption, and float phases to charge quickly while protecting cells from overcharging and reducing sulfation. The result is consistently strong performance and longer battery life, even with extended off-grid operation or generator use.

Three outlets for streamlined power management

Designed for multi-battery systems, the unit provides three outlets so you can simultaneously charge a service (house) battery and two auxiliary banks (such as starter or thruster batteries). This centralized approach is ideal for vessels with multiple power demands or off-grid setups that require reliable, coordinated charging.

MasterBus: centralized visibility and control

Connects to a MasterBus network with a single cable, giving you real-time status, configuration options, and alarms from a dedicated control panel or your computer. The built‑in readout displays charge current, charge voltage, current phase (bulk, absorption, float), and battery health as a percentage of available Ah, plus MasterBus activity indicators and overvoltage alarms to keep you informed without crawling into tight engine spaces.

Global compatibility and practical versatility

With a 120/230 V input (50/60 Hz) and a 12 V output compatible with batteries in the 50–250 Ah range, the ChargeMaster 25 A is ready for international shore-power environments. Its robust, automated charging makes it a versatile solution for yachts, boats, RVs, and off-grid installations that demand reliable power management.

Who benefits

Ideal for sailors with multi-battery systems, yacht owners needing reliable house, starter, and thruster charging, and adventurers who rely on generators or shore power while traveling. If you value plug‑and‑play installation, centralized monitoring, and a proven path to longer battery life, the ChargeMaster 25 Amp delivers.

Key specifications

• Nominal output voltage: 12 V
• Total charge current: 25 A
• Battery outlets: 3
• Battery capacity range: 50–250 Ah per bank
• Nominal input voltage: 120/230 V (50/60 Hz)