Mastervolt Charge Mate Pro Lithium 40 Charging Relay

The Mastervolt Charge Mate Pro Lithium 40 is an electronic charging relay designed to distribute current from a single source, such as an alternator or battery charger, between two separate battery banks. By prioritizing the charging of the primary starter battery, it ensures your engine remains ready to start while providing a controlled, current-limited charge to the secondary service or auxiliary battery.

This unit features advanced electronic MOSFET technology, offering a significantly lower voltage drop compared to mechanical relays and providing complete reverse current protection. Its robust, corrosion-resistant design with IP65-rated electronics makes it suitable for demanding marine and mobile electrical environments.

Key Features:

• Automatic 12/24 V voltage detection.
• Limits charge current to the secondary battery to 40 A.
• Prevents power dips in the onboard electrical network.
• LED status indication for monitoring.
• Compatible with a wide range of battery chemistries, including Lithium, AGM, and GEL.
• Includes emergency start function capability via an optional bypass switch.
• Temperature range: -40 °C to 60 °C.
• Dimensions: 6.2" x 5.5" x 3.1".
• Weight: 1.9 lbs.
• Compliance: CE certified.
• Manufacturer Part Number: 83304004.