SunSaver Duo
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angled view
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straight view
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with remote meter
SunSaver Duo
Morningstar’s SunSaver Duo™ 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.
An optional backlit remote meter can be purchased with this controller, and mounted in or on a wall, to display 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.
“Love it…it was worth the extra money over other brands that seemed to be of lesser quality”
Key features and benefits
- Dual Battery Charging Capability
Solar charge current is shared between the two batteries based on a user selectable priority (house and vehicle for example). When one battery is fully charged, all of the charge current flows to the other battery. This eliminates the need for a second solar charging system and isolation between the batteries. - User Adjustable
Set parameters with on-board DIP switches or further customize with a PC using Morningstar MSView software. - 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.
A. Premium high-frequency CoilCraft surface mount inductors
They’re worth it, because they provide the faster power “tracking” that lets us engineer this much power and control into a compact design.
B. High-frequency design
Combined with premium, “over-spec’d” components, this greatly improves control response which guards against system transients, regulation overshoot and overcurrent/overload conditions
C. Built-in 4500W Transient Voltage Surge Suppression for lightning protection
Nature do your worst–this controller can take it
D. Large diameter, high torque, corrosion resistant terminals
If you’ve ever trashed a lesser terminal during an installation, you’ll appreciate some “overkill” here
E. DirectFET™ MOSFET power devices
Allows the surface-mounting of critical components underneath the main board next to the heat sink, which reduces heat travel distance and keeps the controller even cooler
F. Highly-conductive aluminum heatsink extrusion
As opposed to cast aluminum, which is less effective in passive cooling applications
G. Communications/data port with serial/meter auto detect
“Talks solar” with standard industry language, for system monitoring and cloud connectivity-speaks Modbus, and SNMP (with the EMC-1)
H. Lithium foldback circuit
Lithium batteries are expensive and vulnerable to cold temperatures. When it gets close to freezing, the controller backs-off charging to avoid damaging batteries
I. High-speed ARM processor
All-digital calibration for high accuracy, using the same efficient technology found in advanced mobile device
J. TrakStar™ Technology
Morningstar’s hallmark MPPT technology precisely seeks and locks onto the true maximum power point quickly and accurately, to ensure the highest output possible from a solar array
K. Large format, high-resolution backlit LCD
When you’ve been in the field installing, you appreciated being able to read a crisp, high contrast display on site
L. 5 year warranty
Up to 2 1/2 times longer than some competitors in this class
M. Self-diagnostics
ProStar is smart enough to monitor and analyze system performance, and alert you when you need to know
N. High temperature architecture
Heat is the enemy of all electronics. That’s why Prostar’s critical components are rated to withstand temperatures right up to the boiling point of water (100°C)
O. Lexan polycarbonate UL listed case
Protects the precision electronics inside with an impact strength 30 times greater than the acrylic thermoplastics commonly found on lesser controllers
P. Cooling Fan
Just kidding. We’ve never needed them
Specifications and Certifications
| Model | SSD-25 | SSD-25RM | ||
|---|---|---|---|---|
| *Input power can exceed Nominal Operating Power. Controller will limit and provide its rated continuous maximum output current into batteries. | ||||
| Charge Rating | 25 amps | 25 amps | ||
| Max. PV Open Circuit Voltage (Voc) | 30 volts | 30 volts | ||
| Nominal Battery Voltage | 12V | 12V | ||
| Self Consumption | 6 to 10 mA | 6 to 15 mA | ||
| Battery Voltage Range | 1-15V | 1-15V | ||
| Voltage Accuracy | 1.0% | 1.0% | ||
| Operating Temperature Range | -40 C to +45C | -40 C to +45C | ||
| Warranty | 5 Years | 5 Years | ||
| Remote Meter included |
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| CE and RoHS compliant | Yes | Yes | ||
| Manufactured in a Certified ISO 9001 Facility | Yes | Yes | ||
Datasheets
Download the SunSaver Duo Solar Charge Controller Datasheet.
Operation Manuals
Download the SunSaver Duo Solar Charge Controller Manual.
Videos
ProStar MPPT Controller - 4 minute video
This short video highlights the high quality of the ProStar MPPT solar charge controller, and its ability to regulate charging of lead acid, lithium, or nickel cadmium batteries in off-grid solar applications. The video also addresses lighting control, self-diagnostics, data logging, MODBUS communications, array oversizing, and low noise design.
Morningstar Charging Experts featuring ProStar MPPT
This 5 minute video highlights the ProStar MPPT solar charge controller’s circuit board that differentiates it from other brands. In addition to the capacitors, inductors, processors, surge protectors, and other over-spec’d internal components, the quality of the controller’s heat sink and outer casing is also addressed. The video concludes with mention of features and capabilities related to communications, datalogging, lithium battery charging, and high quality and reliability.
New ProStar MPPT Solar Charge Controller
Recorded Webinar
This 30 minute recorded webinar gives a more in depth overview of how the ProStar MPPT solar charge controller fits into the existing Morningstar portfolio. The recording also includes answers to questions about operating temperatures, the display meter interface, and protections, faults and alerts.
Accessories
DIN Rail Mounting Clips
provides a simple way to install controllers to DIN rails
EIA-485/RS-232 Communications Adapter [RSC-1]
converts RS-232 to EIA-485 so up to 128 MS products can communicate on the same bus
Ethernet MeterBus Converter
enables IP-based networking and internet connectivity for select Morningstar products
Ground Fault Protection Device
prevents current from following any unintended paths during a ground fault
PC MeterBus Adapter
converts a controller's RJ-11 meter port to a RS-232 serial connector for connection to a PC
Remote Meter
provides voltage, current and temperature readings up to 10 meters away from system
Relay Driver
programs conditional generator start/stop, high/low voltage alarms, load control and more
Remote Temperature Sensor
recommended when temperature at the battery and controller differs more than 5°C
Firmware
It’s a recommended best practice to install your product’s latest firmware to ensure access to all up-to-date features, accessory compatibilities, and code modifications. Watch this 5 minute video for instructions on how to download and update ProStar MPPT firmware.
After watching the video, click here to download the firmware.
System Diagrams
Off-Grid Diagram with DC Load
The schematic diagram above, illustrates how the ProStar MPPT regulates power to batteries and a direct current (DC) load in an off-grid system.
- Sunlight contacts the solar modules, which convert solar into DC electrical power that it delivers to a charge controller.
- The charge controller regulates the amperage and voltage that is delivered to the loads and any excess power is delivered to the battery system so the batteries maintain their state of charge without getting overcharged.
- During the evening when there is no sunlight, battery power is used to run the load.
Off-Grid Diagram with AC Load
The schematic diagram above, illustrates how the ProStar MPPT regulates power to batteries and an alternating current (AC) load in an off-grid system. This diagram is very similar to the DC load diagram above it except an inverter has been added.
- Sunlight contacts the solar modules, which convert solar into DC electrical power that it delivers to a charge controller.
- The charge controller regulates the amperage and voltage that is delivered to the battery system so the batteries maintain their state of charge without getting overcharged.
- Batteries deliver power to the inverter which converts DC to AC power that it delivers to the load. Notice that the inverter is connected to the battery, not the controller’s load terminals, like we did in the DC load example. That’s because the inverter can have a high energy surge upon start up, and this high current surge might be higher than the rated capacity of the charge controller, whereas the batteries will be able to meet the high energy surge requirement.