Morningstar SunSaver Duo 25A 12V Dual Battery Solar Charge Controller

As an official distribution partner of Morningstar products across the globe, we are proud to offer solar charge controllers from this world-leading supplier. Innovative design from years of dedicated research and superior build quality enable these top-of-the-range solar charge controllers to extend battery capacity and life, maximise energy production, and consistently achieve high performance standards.

This high-quality Morningstar SunSaver Duo 25A 12V dual battery solar charge controller is well-recognised as the most powerful dual battery controller on the market and is suitable for various applications. It is perfect for caravans, motorhomes, boats, or other systems with 2 batteries (e.g. engine and leisure battery). You can set initial charging priority, such as 90% to the engine battery and 10% to the leisure battery. When one of the batteries is fully charged, the controller will automatically divert all power to the other battery.

Other key features of this controller include:

Extremely high reliability, with a long 5-year warranty and estimated 15-year life
Negative common ground - ideal for most motorhomes, boats, and stationary applications
Epoxy encapsulation protects the controller against dust and high humidity
Four-stage series PWM pulse charging increases your battery life
Specific settings, such as slow switching charging mode for sensitive loads to avoid interference
Lower system cost as the two-battery charging eliminates the need for two separate solar power systems
Easy to install and use, with factory pre-sets, fully automatic operation, and fault recovery

Can the unit work with only 1 battery? Yes, absolutely! The controller will determine automatically if there's only 1 battery connected and will pass 100% of the charging current to this battery. You can add a second battery later.

This powerful 25A controller can work with solar panels up to 400W. It has many protection functions, such as stopping reverse current at night (from the battery to the solar panel), overcharge, short circuit, reverse polarity, etc. Other features include an LED status indicator, battery type selection (sealed or flooded - two batteries can have different types), and an RJ-11 socket for a remote LCD meter. A built-in temperature sensor allows charging adjustment depending on the ambient temperature.

Click on the Details and Specifications tab for more information about this product.

Controller Specifications:

Rated charging current: 25A
Fully automated operation for 12V system
Maximum solar input power: 400W or 25A
Minimum battery voltage: 1V
3 pairs of terminals (battery 1, solar, battery 2)
LED indicator to show operational state and system errors
Temperature sensor for temperature compensation of charging (-30mV/C/12V)
RJ-11 connection point for a remote meter (not included)
Various protection features (overcharge, short circuit, reverse polarity, etc)
Self-consumption: 5.5mA at night, 10mA when charging
Grounding: negative common ground
Working temperature: -40°C to +45°C
Terminals for wire up to 16mm²
Size: 168.8 x 55.1 x 34.5 mm
Weight: 260 g
Multiple mounting holes for ease of installation

The product is covered by a 5-year warranty. For more information please refer to our Terms and Conditions. The product comes with an instruction manual (see the 'Documents' tab for a download link) which explains connections and operations. If you need help with installation or have any technical questions we can provide FREE support - please contact us by email or phone.

You can download the following documents for this product:

Data sheet for SSD-25 Morningstar SunSaver dual battery solar controller

Instruction manual for SSD-25 Morningstar SunSaver dual battery solar controller

Morningstar SunSaver Duo 25A 12V dual battery solar controller for caravans, motorhomes, boats and yachts