Skip to Product Info
    • Mastervolt Charge Mate Pro 40  Electronics Charge Relay 83304002
    • Mastervolt Charge Mate Pro 40  Electronics Charge Relay 83304002
    Sale!

    Mastervolt Charge Mate Pro 40 - Electronics Charge Relay [83304002]

    44% Off
    Sale Price $263.99 Regular Price $471.99
    Shipping calculated at checkout.

    Hurry up! Only 4 left

    Payment & Security

    Your payment is secure. We don’t store or see your card details.

    • Amazon
    • American Express
    • Apple Pay
    • Diners Club
    • Discover
    • Google Pay
    • Mastercard
    • PayPal
    • Shop Pay
    • Visa

    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

    WarningWARNING: 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.


    Owner's Manual (pdf)
    Product Specifications
    Oops, no results found~
    Documents
    User Manual Download
    Specification Sheet Download
    Safety Guide Download
    Service & Support

    Warranty

    This product is backed by a 12-month limited warranty, covering defects in materials and workmanship under normal use.

    Technical Assistance

    Our dedicated support team is available to assist with product setup, operation guidance, and troubleshooting. Contact us via email or phone for prompt service.

    Documentation & Downloads

    Access essential resources including the user manual, technical specifications, and safety instructions in our online support center.

    Replacement Parts & Accessories

    We offer a full range of genuine replacement parts, including batteries, chargers, and compatible accessories to ensure long-term performance.

    Training & Tutorials

    Browse our library of how-to videos and maintenance tips to get the most out of your cordless drill.

    FAQs

    Find quick answers to common questions

    Product & Usage

    1. Is your gear authentic and warranty-backed?

    Yes — we are an authorized US dealer for 300+ marine electronics brands. Every order ships with the manufacturer’s full warranty.

    2. Are these products beginner-friendly?

    Yes. Our products are designed for both seasoned boaters and first-time owners. Each unit ships with a manufacturer manual, and we’re happy to answer setup questions over email.

    3. Are these products built for marine conditions?

    Yes. Marine electronics are engineered for saltwater spray, vibration, and weather. Check the product specs for IPX waterproof rating and saltwater certifications.

    Maintenance & Accessories

    1. What maintenance does marine electronics require?

    Rinse with fresh water after saltwater exposure, store in a dry place, and follow your manufacturer’s cleaning and storage instructions.

    2. Can I buy replacement parts and accessories separately?

    Yes — we carry replacement parts, mounts, transducers, cables, and accessories for the brands we stock.

    3. Do you provide product manuals or installation guides?

    Every product ships with the original manufacturer’s manual. Digital copies and detailed installation guides are typically available on the brand’s website.

    Warranty & Guarantee

    1. Does my purchase include a warranty?

    Yes — every order includes the full manufacturer warranty. Coverage length varies by brand (typically 1–3 years for Garmin, Lowrance, Raymarine, Simrad, Humminbird, Furuno, and others).

    2. How do I register for warranty coverage?

    Register directly with the manufacturer using your unit’s serial number. Manufacturer registration is the fastest path to warranty support if you ever need it.

    3. What does the manufacturer warranty cover?

    Defects in materials and workmanship under normal use. Damage from impact, improper installation, or saltwater corrosion (without protection) may be excluded. Check brand-specific terms in your unit’s documentation.

    4. Can I extend the warranty?

    Some manufacturers offer extended-coverage programs through their registration portals. We don’t sell third-party warranty programs.

    Purchasing & Support

    1. How fast does my order ship?

    Orders placed before 4pm EST Monday–Friday ship the same business day via UPS from our NJ or FL warehouses. Continental US delivery typically takes 3–7 business days for Economy.

    2. Do you offer bulk or fleet pricing?

    Yes — we offer volume pricing for fleet operators, marinas, dealers, and commercial customers. Email support@marineelectronicsdepot.com with your needs.

    3. How can I contact support?

    Email support@marineelectronicsdepot.com or call during business hours (Mon–Fri 9am–5pm ET). We’re happy to help with pre-purchase questions, order status, or post-sale support.

    Can’t find your answer?

    Feel free to reach out to us!

    Recently viewed

    Last seen items