Mastervolt Charge Mate Pro 90
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Estimated Delivery:Sep 03 - Sep 07
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Free Shipping: On all orders over $150
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Mastervolt Charge Mate Pro 90
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Mastervolt Charge Mate Pro 90 - Ultimate Dual Battery Charging Solution
Mastervolt Charge Mate Pro 90 offers high-efficiency multi-battery charging tailored for marine and mobile applications. This innovative product allows effective current distribution between two battery banks, ensuring your starter and service batteries receive optimal charging without the risk of draining each other.
Key Features:
- Current Limiting Technology: Prioritizes charging of the main battery while safely managing the secondary battery’s charge current.
- Reverse Current Protection: Blocks unwanted return current, preserving battery health and ensuring reliable performance.
- Robust IP65 Design: Features a corrosion-resistant casing with aluminum heat sinks, making it perfect for harsh marine environments.
Ideal for leisure and professional marine users, the Charge Mate Pro 90 is a standout product in the battery management category. With its guaranteed quality and efficiency, you can trust it to handle high power demands while ensuring the longevity of your batteries.
Upgrade your charging system today with the Mastervolt Charge Mate Pro 90 — your reliable partner for controlled charging from a single source!

Charge Mate Pro 90
Current limited electronic charge relay with high efficiency and reverse current protection
A secondary battery onboard 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 ChargeMaster 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 consists of a 40 Amp and a 90 Amp version, both suitable for charger or alternator applications. The Charge Mate Pro 90 ensures a higher charge current for example when charging Lithium-Ion batteries. It is also perfectly suitable for large automotive alternators up to 180 A and can be used in parallel operation with a 225 Amp alternator to fulfill even higher continuous power demands of your equipment on board.
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 onboard and/or the need for prioritized or current limited charging.
Features:
- Charges two battery banks from a single source.
- 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 or 90 A.
- High system reliability by prioritizing charging of the main battery.
- Unidirectional which blocks return current under all circumstances.
- Prevents power dips in 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:
- Monitoring: LED (warnings and status indication)
- Output current: limited to 90 A; > 25 °C derating power
- Number of battery outlets: 2
- Input voltage range: 9-32 V
- Parallel configuration: Yes
- Battery voltage: Automatic 12/24 V detection
- Remote switch functions: On, off, auto, start to assist
- Dimensions, hxwxd: 157 x 140 x 80 mm/6.2 x 5.5 x 3.1 inch
- Weight: 0.88 kg/1.9 lb
- Compliance: CE
Technical Specifications:
- Connection possibilities: 3 x faston connectors (switch, ground, and status) • switch: for an optional single-pole ON-OFF-ON switch for remote operation • 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 Multipurpose Contact Output, 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 a low voltage drop of max 0.2 V)
- Temperature range (ambient temp.): -40 °C to 60 °C/-40 °F to 140 °F
- Protection degree: IP65
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.
Shipping Policy
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Carriers
We ship all orders via UPS Ground or FedEx Ground, depending on availability and destination.
Shipping Rates
- Orders under $150: Flat shipping rate of $15
- Orders $150 and above: Free shipping
Note: A handling fee of $7.50 may apply to certain items. If applicable, it will be clearly stated during checkout.
Order Processing
- Orders placed before 12:00 PM ET (Monday–Friday): Processed the same business day
- Orders placed after 12:00 PM ET or on weekends/holidays: Processed the next business day
Delivery Time
All orders are delivered within 3–7 business days from the date of shipment, depending on your location.
For any questions or concerns about your order, please contact us at [hello@outdoors.supply]. We’re here to help!
Discover more in our FAQ
How long does it take to process an order?
All orders are processed the same business day if placed before 12 PM EST. Orders placed after 12 PM EST are processed the following business day.
Do you ship internationally?
No! Currently we are only supporting shipments to contiguous United States. We do not ship to PO Boxes or Internationally.
What is your return policy?
No Returns
Due to the nature of our products and our commitment to ensuring the highest quality standards, we do not accept any returns under any circumstances.
No Refunds
We do not offer refunds for any reason, including but not limited to:
- Change of mind
- Incorrect size or style ordered
- Delayed shipping
- Product dissatisfaction
Please refer to our Refund Policy
What are your sizing options?
We have a size chart displayed on most products to reflect the sizing as accurate as possible. Please review the size chart and ensure you are leveraging the closest size possible.
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Why You'll Love Mastervolt Charge Mate Pro 90
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