Morningstar SunSaver Series Morningstar SunSaver Duo 25A 12V Dual Battery Solar Controller Advanced PWM Technology | Includes Remote LCD Meter | Ideal for RVs, Boats & Off-Grid Systems The Morningstar SunSaver Duo 25A 12V Dual Battery Solar Controller (SSD-25RM) is an advanced Pulse Width Modulation (PWM) charge controller designed to efficiently manage solar charging for two independent 12V battery banks simultaneously. This model includes a remote LCD meter, making it an ideal solution for caravans, motorhomes, boats, and other off-grid applications where both a primary (e.g., leisure) and a secondary (e.g., engine) battery need reliable charging from a single solar array. Utilising Morningstar's renowned SunSaver technology, this controller ensures high reliability and extended battery life through its four-stage series PWM charging algorithm and temperature compensation. Its robust design, including epoxy encapsulation, provides protection against dust and high humidity, ensuring consistent performance in challenging environments. KEY ADVANTAGE: Charges two separate and isolated 12V batteries from a single solar array, with user-selectable charging priorities. Key Features ▶ Dual Battery Charging — Efficiently charges two isolated 12V battery banks from one solar array. ▶ Remote LCD Meter (RM-1) — Provides real-time system status, battery voltages, and charging parameters. ▶ Four-Stage PWM Charging — Extends battery life and maximises charge acceptance for both sealed and flooded batteries. ▶ User-Selectable Priority — Set charging priority (e.g., 90%/10% or 50%/50%) between the two batteries. ▶ Negative Common Ground — Simplifies installation and is suitable for most mobile and stationary applications. ▶ Epoxy Encapsulation — Protects internal electronics from dust, high humidity, and harsh environmental conditions. ▶ Automatic Temperature Compensation — Built-in sensor adjusts charging voltage for optimal battery health. ▶ Extensive Electronic Protections — Guards against common wiring mistakes and system faults. Technical Specifications Parameter Value Rated Charging Current 25A System Voltage 12V (Auto) Max. Solar Input Power 400W Min. Battery Voltage 1V Self-Consumption (Controller) 6-10mA Self-Consumption (Remote Meter) 6-15mA Operating Temperature -40°C to +45°C Wire Terminals Up to 16mm² (#6 AWG) Controller Dimensions (LxWxH) 168.8 x 55.1 x 34.5 mm Meter Dimensions (LxWxH) 97 x 97 x 31 mm Warranty 5 Years Charging & Battery Modes Feature Description Battery Type Selection Supports both sealed and flooded lead-acid batteries. Each battery bank can be configured for a different type. Charging Priority User-adjustable DIP switches allow setting charge distribution, such as 90% to Battery 1 and 10% to Battery 2, or a 50/50 split. Automatic Diversion Once one battery is fully charged, the controller automatically diverts all available solar current to the other battery. Single Battery Operation The controller can operate effectively with only one battery connected, directing 100% of the charging current to it. A second battery can be added later. Typical Applications Application Description Caravans & Motorhomes Ideal for charging both leisure (house) and engine starter batteries from a single solar panel setup. Boats & Yachts Manages charging for service batteries and engine start batteries in marine environments. Off-Grid Cabins & Cottages Suitable for smaller remote power systems requiring two isolated battery banks. Specialised Vehicles Perfect for utility vehicles or mobile workshops with separate power requirements. Built-In Protection Functions The Morningstar SunSaver Duo is equipped with extensive electronic protections to ensure system safety and longevity. These include protection against solar over-current, high temperature, lightning, reverse current at night (from battery to solar panel), solar short circuit, and reverse polarity. The controller is designed to automatically reset after wiring mistakes, eliminating the need for fuses in such scenarios. Common Questions Can this controller charge just one battery? Yes, the SunSaver Duo can operate with a single battery connected to either Battery 1 or Battery 2 terminals. It will automatically detect this and direct 100% of the charging current to that battery. A second battery can be added at a later stage. What types of batteries are compatible? The controller is compatible with both sealed and flooded lead-acid batteries. Importantly, you can configure different battery types for each of the two battery banks, allowing for flexible system design. How does the remote LCD meter connect and what does it display? The remote LCD meter (RM-1) connects via a 10-meter cable (included) with an RJ-11 connector, allowing flexible mounting. It displays various charging parameters such as solar panel current, battery voltages, amp-hours, and temperature, with custom icons and backlighting for easy readability. What is the maximum solar panel wattage this controller can handle? This 25A controller can manage solar panels up to 400W for a 12V system. Installation Notes Ensure all power sources (solar and batteries) are disconnected before wiring. Mount the controller near the batteries in a well-ventilated area, ensuring free airflow around the heat sink fins. Use appropriately sized wiring for the 25A current rating, up to 16mm² (#6 AWG). Connect Battery 1 first, then Battery 2, and finally the solar array, observing correct polarity. The remote meter can be mounted in or on a wall using the included frame and 10m cable. Before You Buy Confirm your system is 12V nominal. This controller is designed for 12V systems. Verify your total solar panel wattage does not exceed 400W for optimal performance. Ensure you have two isolated battery banks if you intend to utilise the dual-battery charging feature fully. Consider the environment for installation; the epoxy encapsulation provides excellent protection, but proper ventilation is still crucial. Review the Morningstar SunSaver Duo manual for detailed wiring diagrams and operational instructions. Please verify all specifications and compatibility requirements for your specific solar power system before purchase. Product specifications are subject to change by the manufacturer.
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