Morningstar SunSaver Duo > 25 Amp 12 Volt PWM Charge Controller
Options: None (Remote meter not included)
Manufacturer Part Number: SSD-25
Morningstar’s SunSaver Duo (SSD-25) is an advanced PWM two
battery controller for RV’s, caravans, boats and cottages.
This product will 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. 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.
This unit does not include the remote meter accessory. To purchase the SSD-25 with a remote meter, see the SSD-25RM. To purchase the remote meter separately, see the RM-1.
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. The remote meter is not included with the SSD-25; the meter must be purchased separately.
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.
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.
|Rated Solar Input|| 25 amps|
|Rated Load Output|| Not applicable|
|Battery Voltage ||12 volts|
|Min. Battery Voltage ||1 volt|
|Max. Battery Voltage ||15 volts|
|Max. Solar Voltage|| 30 volts|
|Self Consumption||Controller 6 to 10 milliamps|
Remote meter 6 to 15 milliamps
|Remote Meter||Not Included||Included|
|Operating Ambient Temperature||
Controller –40°C to +45°C / –40°F to +113°F|
|Meter –20°C to +60°C / –4°F to +140°F|
- Humidity 100% non-condensing
Controller Epoxy encapsulation|
|Anodized aluminum case|
|Corrosion resistant terminals|
|Meter Conformal coated printed circuit board|
|Backlighting|| Push button activated|
|LED’s ||Charging status|
|Displays|| Battery #1 & #2 voltage|
Battery charge priority
Minimum / maximum voltages
Solar charging amps / amp-hours
- Solar Short Circuit
- High Temperature
- Solar Over Current
- Reverse Polarity
- Reverse Current at Night
The SunSaver Duo charges both sealed and flooded lead-acid batteries per the charging specifications in table 1 below. Sealed batteries are typically maintenance-free batteries that do not require water. Flooded batteries have removable caps that allow the addition of water when needed. DIP switches 1 & 2 select the battery type for Battery #1 and Battery #2 respectively. Choose the correct battery type for each battery.
|DIP Switch OFF:|| Sealed battery type (factory pre-set)|
|DIP Switch ON:|| Flooded battery type|
|Regulation Voltage|| Sealed Battery 14.1 volts (at 25°C, 77°F)|
|Flooded Battery 14.4 volts (at 25°C, 77°F)|
- Float Voltage 13.7 volts
- Equalization Voltage* 14.8 volts
- Temp. Compensation –30 millivolts per °C (25°C reference)
|Type of Charging|| Series PWM|
|4 stage: bulk, PWM, float,
|*used on flooded battery only|
Priority|| 90% / 10%|
|50% / 50%|
|Customize via PC connection|
- Controller: 17.0 x 5.6 x 4.1 cm / 6.7 x 2.2 x 1.6 in.
- Meter: 9.7 x 9.7 x 3.1 cm / 3.8 x 3.8 x 1.2 in.
|Meter back:|| 7.4 cm / 2.9 in. diameter|
|2.8 cm / 1.1 in. deep|
|Fits 7.6 cm / 3 in. round hole|
|Weight:|| Controller 260 g / 0.57 lb|
|Meter 135 g / 0.30 lb|
- Largest wire: 16 mm2 (#6 AWG)
- Meter wire: 10 m / 33 ft
- Remote Temperature Sensor — Measures temperature
at battery for improved battery charging
- CE Compliant
- Manufactured in a certified ISO 9001 facility
Warranty: Five year warranty period. Contact Morningstar for complete terms.
The major features of the SunSaver Duo are shown below. An explanation of each feature is provided.
- Remote Temperature Sensor (RTS) Terminals
A connection point for a Morningstar RTS (optional) to remotely monitor battery temperature.
- Local Temperature Sensor
Measures ambient temperature. Battery regulation is adjusted accordingly.
- Status LED Indicator
Provides system status and error indication.
- Settings DIP Switches
Adjustment switches that define the operating parameters of the SunSaver Duo.
- Battery #1 Power Terminals
Power connections for battery #1.
- Solar Input Power Terminals
Power connections for solar module(s).
- Battery #2 Power Terminals
Power wire connections for battery #2.
- Remote Meter Connection (RJ-11)
A communication port for the Morningstar Remote Meter.