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Morningstar Sunsaver Duo 12V 25a Dual Bat Remote Meter Regulator

Morningstar Sunsaver Duo 12Volt 25Amp Two Battery Solar Controller with Remote Meter


Morningstar’s SunSaver Duo is an advanced PWM two battery controller for RV’s, caravans, boats and cottages. This product can charge two separate and isolated batteries at the same time, such as a “house” and an engine battery, based on user selectable priorities.

The SunSaver Duo employs Morningstar’s legendary SunSaver controller technology, whose long-term track record for high reliability and improved battery charging is well-recognized in the solar industry. This controller also includes a backlit remote meter which may be mounted in or on a wall, and displays digital and pictorial status information about the solar power system.

The SunSaver Duo is epoxy encapsulated for environmental protection, is user adjustable via DIP switch or connection to a personal computer, and has an optional remote temperature sensor.




Two Battery Charging
Solar charge current is shared between the two batteries based on a user selectable priority. When one battery is fully
charged, all of the charge current flows to the other battery.


Provides Useful Information
The remote meter and LED’s display system status data and any system errors. Custom icons and back lighting make the meter easy to read and understand.


Lower Cost
Two battery charging eliminates the added cost of two separate solar charging systems and the need for isolation between the batteries.


Easy to Install
The controller is installed near the batteries using the clearly labeled large wire terminals. The remote meter may be mounted in the wall or on the wall using the included frame. Also includes the meter wiring with RJ-11 connector.


Longer Battery Life
Four stage series PWM pulse charging and temperature compensation increases the useful life of the batteries.


Extensive Electronic Protections
The controller will not be damaged by wiring mistakes during installation. There are no fuses to replace, and the controller will automatically re-set after a wiring mistake.


Highly Reliable
Epoxy encapsulation protects the controller against dust and high humidity. Efficient electronics and a conservative thermal design allow the controller to operate reliably at high temperatures. Five year warranty and estimated 15 year life.




  • 5 Year Warranty Period

Technical Specifications


Electrical Specifications
Rated solar input 25 A
Battery voltage 12 V
Min battery voltage 1 V
Max battery voltage 15 V
Max solar voltage 30 V
Self consumption Controller 6 to 10 mA
Remote meter 6 to 15 mA
Battery Charging
Regulation Sealed battery 14.1 V at 25 ºC
Flooded battery 14.4 V at 25 ºC
Float voltage 13.7 V
Equalization voltage 14.8 V
Temp compensation -30 mV per ºC (25 ºC reference)
Type of charging Series PWM: 4 stage : bulk, PWM, float and equalize*
Battery charging priority 90% / 10% ; 50% / 50% and customize via PC connection
Mechanical Characteristics
Controller 17.0 x 5.6 x 4.1 cm
Meter 9.7 x 9.7 x 3.1 cm
Meter back 7.4 cm dia, 2.8 cm deep and Fits 7.6 cm round hole
Weight Controller 340 g and Meter 135 g
Largest wire 16 mm²
Meter wire 10 m
Operating ambient temperature Controller -40ºC to +45ºC
Meter -20ºC to +60ºC
Humidity 100% non-condensing
Tropicalization Controller Epoxy encapsulation Anodized aluminum case Corrosion resistant terminals
Meter conformal coated printed circuit board
Meter Display
Backlighting Push button activated
LED's Charging status : Errors : Battery level

Battery #1 & #2 voltage
Battery charge priority
Minimum / maximum voltages
Solar charging amps / amp-hours


Electronic Protections
Solar Short Circuit Height temperature
Solar Over Current Lighting
Reverse polarity Reverse current at night

*used on flooded battery only

Quality and Safety


  • CE Compliant
  • Manufactured in a certified ISO 9001 facility

Downloads and Manuals



Sunsaver Duo 12V 25a Dual Bat Remote Meter Regulator

For components pricing,
availability, purchase
or other enquiries, visit
our components site,
Apollo Energy
  • Model: SSD-25RM
  • Shipping Weight: 0.5kg
  • Manufacturer:

This product was added to our catalog on Monday 01 October, 2007.