Two-from-one

FOR VESSELS WITH two batteries and only one charging source, this intelligent relay connects both batteries during charging, but keeps them isolated from each other when being drained, significantly reducing the risk of a flat battery.

Unlike the earlier mechanical versions, Mastervolt’s new Charge Mate Pro 40 provides an electronic charge coupling with a very low voltage drop, making the charging of two batteries from one source at the same time both effective and efficient.

The module limits the charge to the second battery to no more than 40 Amps and ensures the primary battery (usually an engine starter) is charged as a priority. The return current is automatically blocked, even if the secondary battery is of a higher voltage. In the event of a failing main battery, an emergency start function is available by means of an optional bypass switch.

The Charge Mate Pro can be used in any situation where a vessel has two batteries served by only one charging source, such as when a bow thruster battery and a service battery are connected to the alternator.

In this instance, the Pro 40 would ensure that the service battery is fully charged first, while also feeding charge to the thruster battery. The subsequent blocking of any return current from this second battery keeps the service battery in peak condition, and also prevents any power dips in the electrical network.

Charge Mate Pro 40 is suitable for all kinds of chargers and alternators. The electronics are rated to the IP67 standard and housed in a corrosion resistant casing, which is flanked by two aluminium heat sinks and features an LED status indicator. Automatic battery detection means that this device will work seamlessly with either 12 V or 24 V batteries. BEP Marine liam.mcilveen@powerprodllc.com