Morningstar SunSaver Duo 25A 12V dual battery solar controller for caravans, motorhomes, boats and yachts
Morningstar SunSaver Duo 25A 12V dual battery solar controller for caravans, motorhomes, boats and yachts
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Morningstar SunSaver Duo 25A 12V Dual Battery Solar Controller
Model SSD-25 | Advanced PWM | For Caravans, Motorhomes & Boats
The Morningstar SunSaver Duo 25A 12V Dual Battery Solar Charge Controller (SSD-25) is engineered for reliable and efficient charging of two independent 12V battery banks from a single solar array. Utilising advanced Pulse Width Modulation (PWM) technology, this controller is an ideal solution for mobile and off-grid applications such as caravans, motorhomes, boats, and cottages, where both a 'house' and an engine battery need to be maintained.
Designed for high reliability and extended battery life, the SunSaver Duo allows users to set charging priorities between the two batteries. Once one battery is fully charged, the controller intelligently diverts all available solar power to the other battery, ensuring optimal charge distribution and preventing overcharging.
VERSATILE OPERATION: This controller can also operate effectively with a single battery connected, automatically directing 100% of the charging current to it. A second battery can be added later without reconfiguring the system.
Key Features
| ▶ Dual Battery Charging — Simultaneously charges two isolated 12V battery banks from one solar array. |
| ▶ User-Selectable Priority — Distribute charge current with adjustable priority (e.g., 90/10 or 50/50) between batteries. |
| ▶ Advanced PWM Technology — Four-stage series PWM charging extends battery life and maximises energy production. |
| ▶ Epoxy Encapsulation — Provides superior environmental protection against dust and high humidity for enhanced durability. |
| ▶ Negative Common Ground — Simplifies wiring and is suitable for most mobile and stationary applications. |
| ▶ Temperature Compensation — Built-in sensor adjusts charging based on ambient temperature for optimal battery health. |
| ▶ Easy Installation — Clearly labelled terminals and automatic operation simplify setup and use. |
Technical Specifications
| Parameter | Value |
|---|---|
| Rated Charging Current | 25A |
| System Voltage | 12V (Automatic) |
| Max. Solar Input Power | 400W |
| Max. Solar Voltage (Voc) | 30V |
| Min. Battery Voltage | 1V |
| Self-Consumption | 5.5mA (night), 10mA (charging) |
| Operating Temperature | -40°C to +45°C |
| Terminals (Wire Size) | Up to 16mm² (#6 AWG) |
| Dimensions (L x W x H) | 168.8 x 55.1 x 34.5 mm |
| Weight | 260 g |
Charging & Battery Modes
The SunSaver Duo employs a sophisticated 4-stage PWM charging algorithm to ensure optimal battery health and longevity. It supports various 12V battery types and includes essential features for precise charging control.
| Feature | Description |
|---|---|
| Charging Stages | Bulk, PWM (absorption), Float, and Equalisation (for flooded batteries only). |
| Battery Type Selection | Supports Sealed and Flooded lead-acid batteries; allows different types for each battery bank. |
| Temperature Compensation | Automatic adjustment of charging voltage based on ambient temperature (-30mV/°C/12V). |
| Remote Meter Port | RJ-11 connection for an optional remote LCD meter (RM-1) to display system status. |
| DIP Switch Settings | User-adjustable settings for charging parameters and priority via DIP switches. |
Typical Applications
| Application | Description |
|---|---|
| Caravans & Motorhomes | Efficiently charges both leisure and engine batteries from a single solar panel setup. |
| Boats & Yachts | Ideal for marine environments, maintaining both house and starter batteries. |
| Off-Grid Cabins & Cottages | Provides reliable dual battery management for remote power systems. |
| Dual-Battery Backup Systems | Ensures continuous power for critical loads by managing two battery banks. |
Built-In Protection Functions
The Morningstar SunSaver Duo is equipped with extensive electronic protections to safeguard your system and ensure reliable operation. These include: Solar Short Circuit Protection • Solar Over Current Protection • Reverse Polarity Protection (solar and battery) • Reverse Current at Night Protection (from battery to solar panel) • High Temperature Protection • Overcharge Protection. The controller is designed to automatically reset after wiring mistakes, eliminating the need for fuses.
Common Questions
Can this controller charge just one battery?
Yes, the SunSaver Duo will automatically detect if only one battery is connected and direct 100% of the charging current to it. You can add a second battery at any time.
What type of batteries is it compatible with?
The controller is compatible with 12V Sealed and Flooded lead-acid batteries. It allows for different battery types to be connected to each of the two battery banks.
Is a remote meter included with the SSD-25?
No, the remote LCD meter (RM-1) is an optional accessory and is not included with the standard SSD-25 model. It can be purchased separately for enhanced system monitoring.
What is the maximum solar panel wattage this controller can handle?
The Morningstar SunSaver Duo 25A can handle a maximum solar input power of 400W for a 12V system.
Installation Notes
- Ensure all power sources (solar and batteries) are disconnected before installation.
- Mount the controller near the batteries in a well-ventilated area, away from direct sunlight or heat sources.
- Use appropriate wire gauges (up to 16mm²) for all connections to minimise voltage drop.
- Connect batteries first, then the solar array, following the clearly labelled terminals.
- Verify correct polarity for all connections to prevent damage.
Before You Buy
- Confirm your system voltage is 12V and your total solar panel wattage does not exceed 400W.
- Check battery types (Sealed or Flooded) to ensure compatibility.
- Consider if an optional remote meter (RM-1) is required for detailed system monitoring.
- Review the product manual for detailed wiring diagrams and setup instructions.
- Ensure adequate space for mounting the controller and proper ventilation.
Always verify product specifications and compatibility with your specific solar power system components before purchase and installation. Consult a qualified installer if unsure. Morningstar products are known for their reliability and are backed by a manufacturer's warranty.
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