SS-MPPT-15L Sun Saver Professional Series
User Guide
Contents
SS-MPPT-15L Sun Saver Professional Series
Scan QR Code to go directly to the Sun Saver MPPT Installation Manual and warranty information online.
https://www.morningstarcorp.com/wp-content/uploads/2014/2014/02/SSMPPT.IOM_.EN_.03-4-131.pdf
Warranty Registration: https://www.morningstarcorp.com/product‐registration/
Safety Information
WARNING: Shock Hazard
The Sun Saver MPPT controller must be installed by a qualified technician in accordance with the electrical regulations of the country of installation.
WARNING: Shock Hazard
This unit is not provided with a GFDI device. This charge controller must be used with an external GFDI device as required by the Article 690 of the National Electrical Code for the installation location.
IMPORTANT: READ the Sun Saver MPPT Installation Manual for safety and regulatory information, instructions on configuration and operation, and warranty information.
In the Box:
Tools Required:
— #2 Philips Screwdriver
— 3/16 (5 mm) & 3/32″ (2.5 mm) Flathead Screwdriver
— Drill with a 3/32″ (2.5 mm) bit
— Multimeter
Optional Accessories
SunSaver MPPT™ Charge Controller
Minimum Clearance Requirements:
WARNING: Explosion Hazard
Never install the Sun Saver MPPT in an enclosure with vented/flooded batteries. Battery fumes are flammable and will corrode and destroy the Sun Saver circuits.
WARNING: Risk of Fire
If a Remote Temperature Sensor (RTS) is NOT connected, locate the Sun Saver MPPT within 3 m (10 ft) of the batteries. Internal temperature compensation will be used if the RTS is not connected. Use of the RTS is strongly recommended.
CAUTION: Equipment Damage
Do not expose the Sun Saver MPPT to weather. Locate in a dry, protected area to prevent equipment damage. Ensure the minimum clearance requirements are followed to provide equate ventilation and prevent the unit from overheating.
Mounting
Step 1: Choose Mounting Location
Locate the Sun Saver MPPT on a vertical surface protected from direct sun, high temperatures, and water.
Step 2: Check for Clearance and Ventilation
Place the Sun Saver MPPT in the location where it will be mounted. Verify that there is sufficient room to run wires and that there is ample room above and below the controller for air flow.
Step 3: Mark Holes
Use a pencil or pen to mark the four (4) mounting hole locations on the mounting surface.
Step 4: Drill Holes
Remove the controller and drill 3/32” (2.5 mm) holes in the marked locations.
Step 5: Secure Controller
Place the controller on the surface and align the mounting holes with the drilled holes in step 4. Secure the controller in place using the Mounting screws (included).
Photovoltaic (PV) Array
See the Morningstar PV String Calculator at: https://string‐calculator.morningstarcorp.com/
IMPORTANT:
Array Voltage should NEVER exceed the maximum input voltage.
STATUS LED
| Color | Indication | Operating State |
None |
OFF (with heartbeat¹) | Night |
Green  |
ON Solid (with heartbeat²) | Charging |
Red  |
Flashing | Error |
| Red |
ON Solid (with heartbeat²) | Critical Error |
¹ heartbeat indication flickers the Status LED ON briefly every 5 seconds
²heartbeat indication flickers the Status LED OFF briefly every 5 seconds
| Recommended Order of Installation |
Wiring and Torque Requirements | |||||
| Component | Wire Size (Solid) | Wire Size (multistring) | Wire Size (fine strand) | Torque (Maximum) | Tool Required | |
| 1 | Load Terminals | #6 AWG 16 mm2 (Maximum) |
#6 AWG 16 mm2 (Maximum) |
#8 AWG 10 mm2 (Maximum) |
10.6 in-lbs. (1.2 Nm) |
3/1615 mm)  Flathead Screwdriver |
| 2 | Battery Terminals | |||||
| 3 | Solar Terminals | |||||
| 4 | Remote Temperature Sensor |
#22 AWG / 0.3 mm2 (Minimum) #12 AWG / 3.0 mm2 (Maximum) |
3.5 in-lbs. (0.4 Nm) |
3/32″ (2.5 mm) Flathead Screwdriver |
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| 5 | Fuses or Disconnects | *Fuse or breaker sizing must be based on required wire ampacity. If using a fuse, do NOT insert the fuse in the fuse-holder until after all the other connections have been completed. |
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IMPORTANT: Example only. Actual wiring may vary. READ the Sun Saver MPPT Installation, Operations, and Maintenance Manual for mandatory safety requirements. All configuration must comply with local and national electric codes. Consult your local electric authority to ensure compliance.
| BATTERY STATE-OF-CHARGE (SOC) LEDs | |||
| SOC LED | Indication | Battery Status | Load Status |
| Green |
Fast Flashing (2 Flash / sec) | Equalize Charge | Load ON |
| Green |
Medium Flashing (1 Flash / sec) | Absorption Charge | Load ON |
| Green |
Slow Flashing (1 Flash / 2 sec) | Float Charge | Load ON |
| Green |
ON Solid | Nearly Full | Load ON |
Yellow  |
ON Solid | Half Full | Load ON |
| Red |
Flashing (1 Flash / sec) | Battery Low | LVD Warning (Load On) |
| Red |
ON Solid | Battery Empty | LVD (Load Off) |
WARNING: Shock Hazard
Test between all terminals and ground before touching.
Power or accessory terminals are NOT electrically isolated from DC input and may be energized with hazardous solar voltage.
WARNING: Shock Hazard
Fuses, circuit breakers, and disconnect switches never open grounded system conductors. Only GFDI devices are permitted to disconnect grounded conductors.
IMPORTANT:
Ensure there is only 1 DC Negative‐to‐Ground Bond in the entire system.
Power UP Sequence:
- Connect Battery/Battery Bank.
- Connect Solar.
Power DOWN Sequence:
- Disconnect Solar.
- Disconnect Battery/Battery Bank.
Specifications:
| SS-MPPT-15L | |
| Nominal Battery Voltage | 12 V or 24 V |
| Max. Solar Input Voltage | 60 V |
| Nominal Maximum Input Power | 200 W / 400 W |
| Maximum Battery Current | 15 A |
| Battery Voltage Range | 7 – 36 V |
| Rated Load Current | 15 A |
Operational Configuration:
- Set points for this switch setting can be modified with custom programming.
Contact Information:
Technical Support: Support.morningstarcorp.com
Phone: 1‐215‐321‐4457
| BATTERY SET POINTS 12-volt (24-volt) |
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| Set Point | GEL | Sealed | AGM | Flooded |
| Absorption Voltage | 14.0 V (28.0 V) |
14.1 V (28.2 V) |
14.3 V (28.6 V) |
14.4 V (28.8 V) |
| Float Voltage | 13.7 V (27.4 V) |
13.7 V (27.4 V) |
13.7 V (27.4 V) |
13.7 V (27.4) |
| Time until Float | 3 hours | 3 hours | 3 hours | 3 hours |
| Equalize Voltage | N/A | N/A | 14.5 V | 14.9 V |
| Equalize Duration | N/A | N/A | 3 hours | 3 hours |
| Equalize Calendar (days) | N/A | N/A | 28 | 28 |
| Maximum Regulation Voltage* | 15 V (30 V) | |||
| LVD**/ LVR** (Switch 2 OFF) | 11.5 V /12.6 V @ 12 V (23.0 V/25.2 V @ 24 V) | |||
| LVD**/LVR** (Switch 2 ON) | 11.0 V/12.1 V @ 12 V (22.0 V/24.2 V @ 24 V) | |||
| Load HVD** | 15.3 V (30.6 V) | |||
| Load HVR** | 14.5 V (29 V) | |||
| Array HVID (Temp. Comp.) | Highest voltage set point + 0.5 V | |||
| Array HVR (Temp. Comp.) | 13.8 V (27.6 V) | |||
| Not temperature compensated. 15 V @ 12 V nominal, 30 V @ 24 V nominal. ** Adjustable by DIP Switch 2. Not temperature compensated. Can be modified in custom settings. |
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1 For Custom Programming:
Use the software available at https://www.morningstarcorp.com/msview/.
See the Sun Saver MPPT Installation, Operations, and Maintenance Manual for additional information/guidance.
Switch 2: Load Control /
Low Voltage Disconnect/Reconnects
Switch 3: Auto-Equalization
Switch 4: Communication Mode -Meter/MODBUS® 
Remote Meter, & Relay Driver
MODBUS® Protocol for MS View, Ethernet Meter bus Converter, 3 rd. ‐Party Devices
© 2021 Morningstar Corporation.
All Rights Reserved.
MS‐003294 SS‐MPPT
QSG (3/16/2021) Rev C03