The REDARC Manager Alpha75 is a premium battery management system designed to efficiently charge and maintain auxiliary batteries in caravans, camper trailers, and recreational vehicles. Combining DC, AC, and solar charging, it delivers reliable power in any environment—ensuring your secondary battery bank stays topped up no matter where your adventures take you.
With up to 75A of charge available from multiple power sources simultaneously, the Alpha75 easily supports high-demand appliances including induction cooktops, fridges, and air conditioners. It’s engineered to replenish energy faster than you can consume it, all while maintaining maximum system efficiency.
Compact, lightweight, and built to withstand the harshest conditions, the Manager Alpha75 frees up valuable space for gear and provides total control and visibility through the integrated RedVision display.
Key Features
- Built for the Outback: Tested against extreme vibration standards and rugged Australian touring conditions.
- Simultaneous 75A Charging: DC, AC, and solar charging work together to deliver rapid and efficient power.
- Start Battery Charge & Recovery: Uses excess solar power to maintain or recover your start battery in the event of a flat.
- Smart Battery Monitor: Bluetooth 5.1 connectivity provides reliable monitoring up to 42 metres away.
- RedVision Integration: View state of charge, remaining capacity, current flow and full system diagnostics.
- Compact & Lightweight: Up to 55% smaller and 20% lighter than comparable systems.
- Dual Battery Support: Includes start battery back-charge and recovery features.
- 2-Year Warranty for peace of mind.
Specifications
- Current Measurement Range: ± 500A
- Start Battery Input Voltage: 9–32V DC
- Solar Input Voltage: 9–32V DC
- Nominal Output Voltage: 12V
- Supported Battery Types: Gel, AGM, Calcium, Standard Lead Acid, Lithium
- Nominal Charge Current: 75A
- AC Input Voltage: 95–264V AC, 45–65 Hz
- Operating Temperature Range: –20°C to 60°C
REDARC Manager Alpha Series: Comprehensive Cable Sizing & Terminal Specifications
This technical resource outlines the exact wiring, cabling, and installation parameters for the REDARC Manager Alpha series (Alpha 50, Alpha 75, and Alpha 100).
1. Key Engineering Constraints & The “Step-Down” Rule
- The Physical Terminal Limit: The built-in connection terminals on all REDARC Manager Alpha main units (Alpha 50, 75, and 100) physically accommodate a maximum lug size of 4 AWG / 4 B&S (25 mm²) with M6 studs.
- The Short-Tail / Step-Down Assembly Requirement: Because 75A and 100A current draws require main supply cables much thicker than 4 AWG, installers cannot run heavy-gauge lines directly into the unit. A distribution block, heavy-duty busbar, or inline joiner must be positioned within 0.5 metres of the Alpha unit to step down the heavy feed line to a short 4 AWG tail entering the machine.
2. Cable Sizing & Fuse Matrix by Model
To prevent excessive voltage drop—which causes the Manager Alpha to falsely assume the source battery is depleted and throttle down its charging profile—the following cross-sectional areas and circuit protection ratings must be strictly adhered to:
| Model | Continuous Output | Short Runs (0 – 3 Metres) | Long Runs (3 – 6+ Metres) | Required Fuse Protection |
|---|---|---|---|---|
| Manager Alpha 50 | 50 Amps | 6 B&S to 4 B&S (13.5 mm² – 25 mm²) |
4 B&S to 2 B&S (25 mm² – 32 mm²) |
60A MIDI Fuse |
| Manager Alpha 75 | 75 Amps | 4 B&S (25 mm²) Requires short 4 AWG tail |
2 B&S to 0 B&S (32 mm² – 50 mm²) Requires step-down assembly |
100A MIDI Fuse |
| Manager Alpha 100 | 100 Amps | 2 B&S (32 mm²) Requires step-down assembly |
0 B&S to 00 B&S (50 mm² – 65 mm²) Requires step-down assembly |
120A MIDI Fuse |
Note: Cabling configurations must always account for environmental temperatures. For engine bay routing or high-ambient installations, always step up to the next available cable thickness tier to maintain current throughput efficiency.
3. Product Ecosystem & Purchase Disclaimers
- All-in-One Packaging Architecture: The REDARC Manager Alpha main cores cannot be purchased or supplied as standalone units. To ensure precise data communication protocols and state-of-charge metric calculations, every model is exclusively shipped as a factory-matched kit containing:
- The Manager Alpha core charger.
- The RedVision Pro Display interface screen.
- The Smart Battery Monitor (comprising the proprietary 500A digital shunt).
- System Coexistence Limits: The Manager Alpha cannot be wired in parallel alongside a legacy REDARC Manager30 on the same auxiliary battery bank. Their internal microprocessors and state-of-charge calculation shunts will conflict. For high-output demands exceeding 50A, consumers must deploy the standalone Alpha 75/100 systems, or supplement a Manager30 exclusively via secondary, slave-configured BCDC or BCDC Alpha DC-to-DC chargers.
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