Meet the Mastervolt Charge Mate Pro 90, Model 83309002—a smart electronic charge coupling that evenly distributes charging current between two battery banks to keep your starter and service batteries ready when you need them.
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Output current: Up to 90 A total; secondary battery charging limited to 40 A; derates above 25°C to protect performance.
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Two battery outlets with auto-detection: Automatic 12/24 V detection for two battery banks (starter and service).
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Unidirectional protection: Blocks return current under all conditions to guard your onboard electrical network from voltage dips.
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Priority charging: Ensures the primary (starter) battery is charged first, reducing the risk of a flat engine battery.
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Battery types supported: All battery types supported, including Lithium Ion; Li‑ion protection via multipurpose contact; dedicated secondary-battery solution if needed.
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Remote operation: On, Off, Auto, and Start Assist remote switch functions; optional emergency start bypass for added flexibility.
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Marine-grade design: IP65 electronics in a corrosion-resistant housing with aluminum heat sinks for reliable performance at sea or on land.
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Parallel configuration: Supports parallel operation for higher power demands.
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Monitoring: LED status indicators provide warnings and operation cues for quick diagnostics.
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Easy installation and compatibility: Universal compatibility with all chargers and alternators; designed for straightforward installation.
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Dimensions: 6.2 x 5.5 x 3.1 inches.
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Weight: 1.9 lb.
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Connection options: 3 fast-on connectors (switch, ground, status).
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Electrical details: Input range 9–32 V; automatic 12/24 V detection; switch on voltage 13.5 V (12 V) / 27 V (24 V); switch on delay 5 seconds; switch off voltage 12.75 V (12 V) / 25.5 V (24 V); switch off delay 2.5 seconds; MOSFET-based relay with low voltage drop (< 0.2 V).
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Temperature & protection: Operating range −40 °C to 60 °C; IP65 protection.
The Charge Mate Pro 90 is built to keep two critical battery banks in sync without compromising performance. It’s ideal for boats and vehicles with larger alternators and Li‑ion packs, offering reliable dual-battery management, straightforward installation, and flexible control options to match your start‑and‑systems needs.
| 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 assist |
| Dimensions, hxwxd |
6.2 x 5.5 x 3.1 inch |
| Weight |
1.9 lb |
| Technical specifications |
| Connection possibilities |
3 x fast-on 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 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 |
| Protection degree |
IP65 |
