SKU: 98534665821

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

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Description

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

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.


Owner's Manual (pdf)
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 98534665821

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Sal
Massapequa, US
★★★★★ 5
Direct Fit and good quality
Color: Single Slat Gloss Black, Size: 2002-2005 E46
For anyone that has owned an E46 knows that even the stock kidney grills are brittle plastic. This aftermarket is about the same quality as stock. It is a direct fit and has the clips where they are supposed to be to keep them in place. The look is also pretty nice. This one is all black and actually looks nice on my black E46. I would recommend especially for the price and shipping was fast.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 29, 2025
C
Verified Purchase
Christian Burt
Fort Morgan, US
★★★★★ 5
Easy install
Color: Single Slat Gloss Black, Size: 2023+G20
Fits well. Made of plastic but very easy install.
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Reviewed in the United States on March 19, 2026
M
Verified Purchase
Mecha Drew
Alexandria, US
★★★★★ 1
I should have read all the other reviews ...
Color: Single Slat Gloss Black, Size: 2010-2013 E92, Color: Single Slat Gloss Black, Size: 2010-2013 E92
I read all the bad reviews, but I gave it a shot anyways Tabs wont clip in place and fitment is slightly off.
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Reviewed in the United States on May 1, 2026
C
Verified Purchase
Charles Sherin
Los Angeles, US
★★★★★ 5
Worth it
Color: Single Slat Gloss Black, Size: 2006-2009 E92
For perfect and looks great
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Reviewed in the United States on February 5, 2026
M
Verified Purchase
Madison
New York, US
★★★★★ 5
Very nice quality
Color: Single Slat Gloss Black, Size: 2019-2022 G20
I have a 2022 330i bmw and it fit perfectly! Looks just like photos online and delivered quick!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 27, 2025

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