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Photonic Universe

Morningstar SunSaver Duo 25A 12V dual battery solar controller (with remote LCD meter) for caravans, motorhomes, boats and yachts

Morningstar SunSaver Duo 25A 12V dual battery solar controller (with remote LCD meter) for caravans, motorhomes, boats and yachts

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25A dual battery solar charge controller / regulator and LCD monitor for independent charging of two 12V batteries (can be used with 1 battery too) for solar panels up to 400W

SPECIAL NOTICE : If you are purchasing this part for a self build project, please see our terms & conditions. FULFILLED BY PHOTONIC UNIVERSE : This product is fulfilled by Photonic Universe, our Solar partner.



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 with LCD remote meter 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 e.g. 90% engine battery and 10% 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 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), over charge, 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 a built-in temperature sensor that allows charging adjustment depending on the ambient temperature.

The controller comes with a remote LCD display / meter which is connected via 10m cable (included). The remote meter can display various charging parameters such as solar panel current, battery voltages, amp-hours, temperature etc. The large numerical display and buttons allow easy navigation through the meter menu and a quick point of reference for your solar power system.

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

Details & Specification


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)
  • Various protection features (over charge, short circuit, reverse polarity etc)
  • Self-consumption: 5.5mA at night, 10mA when charging, remote meter 6-15mA
  • Grounding: negative common ground
  • Cable lenth for remote meter: 10m
  • Working temperature: -40C to +45C
  • Terminals for wire up to 16mm2
  • Size of controller: 168.8 x 55.1 x 34.5 mm
  • Size of meter: 97 x 97 x 31 mm
  • Weight: controller 260g, meter 135g
  • Multiple mounting holes for ease of installation


The product is covered by 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 (see Contact Us page for more information).


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