Mastervolt ChargeMaster Plus 12/35-3 Charger

The Mastervolt ChargeMaster Plus 12/35-3 is a 12V 35A three-output charger with auto-ranging AC input and MasterBus connectivity.

Cos phi 1 regulation is the specification that matters on a boat with a generator. It means the charger draws current in phase with the voltage, so it uses nearly all of what the generator produces. A charger with poor power factor demands far more generator capacity than its rating suggests, which is how a 35 amp charger stalls a small genset.

Auto-ranging AC input works from shore supplies worldwide without manual voltage switching, and a memory function guards against overcharging when the incoming supply is unreliable. The 3-Step Plus process covers a broad range of chemistries including lithium-ion and handles deeply discharged batteries rather than refusing them.

The illuminated display shows charging current, voltage, charge phase, battery condition and MasterBus status, so the whole picture is visible without a separate monitor. It also runs as a DC power supply with no batteries connected, keeping lighting or refrigeration powered, and metal-to-metal connections with strain relief resist corrosion and overheating. Explore more 3-bank battery chargers.

• Cos phi 1 makes near-full use of generator capacity
• Poor power factor stalls a small genset
• Auto-ranging AC input works worldwide
• Runs as a DC supply with no batteries connected