Mastervolt Charge Mate Pro 40 Electronics Charge Relay for Dual Battery Management

Charge Mate Pro 40 - Electronics Charge Relay

Current limited electronic charge relay with high efficiency and reverse current protection

A secondary battery on board requires a dedicated charging solution. The Charge Mate Pro makes it possible to distribute the charger or alternator current effectively between two battery banks such as a starter and a service battery. The Charge Mate Pro connects both batteries during charging and keeps them isolated when discharging. This significantly reduces the risk of a flat starter battery for example.

The Charge Mate Pro offers an additional advantage over mechanical charge relays, by limiting the charge current to the second battery. The primary battery, like a starter battery, is therefore charged with priority. The return current is automatically blocked even when the secondary battery has a higher voltage. An emergency start function is possible by connecting an optional bypass switch to the Charge Master Pro.

A marine application example is the connection of a bow thruster battery to a service battery. The Charge Mate Pro ensures that the service battery is always charged with priority. The blocking of the return current from the bow thruster battery guarantees that the bow battery remains charged while the current limiting also prevents power dips of the onboard electrical network.

The Charge Mate Pro series consist of a 40 Amp and a 90 Amp version, both suitable for charger or alternator applications.

Charge Mate Pro: for controlled charging from a single source.

Applications

• Leisure and professional marine and mobile applications. An effective solution for high power demand on board and/or the need of prioritised or current limited charging.

Features

• Electronic charge coupling with very low voltage drop
• Makes effective dual charging possible
• Suitable for all battery types, including Lithium Ion
• Charge current secondary battery limited to 40 A
• High system reliability by prioritised charging of the main battery
• Unidirectional which blocks return current under all circumstances
• Prevents power dips of the onboard electrical network
• Suitable for all kinds of chargers and alternators
• Monitoring with LED status indication
• IP65 electronics in a corrosion resistant casing with aluminum heat sinks
• Fast and easy installation

General specifications

• Remote switch functions: on, off, auto, start assist
• Monitoring: LED (warnings and status indication)
• Output current: limited to 40 A
• Number of battery outlets: 2
• Input voltage range: 9-32 V
• Parallel configuration: yes
• Battery voltage: automatic 12/24 V detection
• Dimensions, hxwxd: 157 x 140 x 80 mm / 6.2" x 5.5" x 3.1"
• Weight: 0.88 kg / 1.9 lb
• Approvals: CE

Technical specifications

• Connection possibilities: 3 x fast-on connectors (switch, ground and status) o switch: for an optional single pole ON-OFF-ON switch for remote operation o status: for an optional LED indicator
• Power consumption: switch open: < 1 mA at 12/24 V DC
• Battery types: all types (Lithium Ion protection via Multi purpose contact, product code 77030500)
• Switch on voltage: 13.5 V (12 V) / 27 V (24 V)
• Switch on delay: 5 sec.
• Switch off voltage: 12.75 V (12 V) / 25.5 V (24 V)
• Switch off delay: 2.5 sec.
• Relay: electronically (mosfets with low voltage drop of max 0.2 V)
• Temperature range (ambient temp.): -40 C to 60 C -40 to 140 F
• Protection degree: IP65

WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.

The Mastervolt Charge Mate Pro 40 is a high-efficiency, current-limited electronic charge relay designed for marine and mobile applications requiring reliable dual battery charging solutions. This device effectively distributes charging current from a single source, such as a charger or alternator, to two separate batteries while maintaining optimal performance and safety. Its primary function is to connect both batteries during charging and isolate them during discharging, which helps prevent issues like a dead starter battery and ensures consistent power availability for critical systems. The Charge Mate Pro 40 automatically manages the flow of current, prioritizing the main battery and blocking return currents to protect against power dips and potential electrical faults.