Mastervolt 83304002 Charge Mate Pro 40 Electronic Battery Charge Relay 40A

The Mastervolt Charge Mate Pro 40 is an intelligent electronic charge relay designed for dual battery systems on boats, RVs, and other mobile applications. This advanced device automatically connects both batteries during charging while keeping them isolated during discharge, ensuring optimal power management and system reliability.

Unlike simple mechanical battery isolators, the Charge Mate Pro 40 features electronic switching with minimal voltage drop, maximizing charging efficiency. It intelligently limits charge current to the secondary battery to 40 Amps, prioritizing the main battery to ensure critical systems remain powered. The unidirectional design blocks return current under all circumstances, preventing power dips in the onboard electrical network.

Key Features:

• Electronic charge coupling with extremely low voltage drop for maximum efficiency
• 40 Amp charge current limit to secondary battery ensures priority charging of main battery
• Unidirectional operation blocks return current, eliminating voltage dips in the primary system
• Compatible with all battery charger types and alternators
• LED status indicator for easy monitoring
• IP67-rated waterproof electronics in corrosion-resistant housing
• Integrated aluminum heat sink for reliable thermal management
• Optional bypass switch connection enables emergency-start function

The rugged IP67-rated construction with aluminum heat sink makes the Charge Mate Pro 40 ideal for harsh marine and mobile environments. Installation is straightforward, and the LED indicator provides at-a-glance status confirmation of charging operation.