Morningstar SK-12 SunKeeper 12A Solar Charge Contoller 12V
List Price: $89.00
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Morningstar SK-12 Summary
Product Type
Charge Controller
Battery Voltage
12 Volts
Charging Type
Output Current
12 Amps
PV Open Circuit Voltage
30 Voc
PV Input @ 12V
144 Watts

Morningstar SK-12 SunKeeper 12A Solar Charge Contoller 12V

SunKeeper 12A, 12V

Morningstar's SunKeeper solar controller provides a low cost regulated output directly from the solar module to maximize battery life in small solar power applications. The SunKeeper is epoxy encapsulated and rated for outdoor use. By mounting directly to the module junction box and wiring through the junction box knockout, the connection is weather-proof. This eliminates the need for an additional housing for the controller.

The SunKeeper is available in a 6 amp or 12 amp version (both at 12 volts DC). To withstand the high temperatures at the solar module, the controller has been designed using extremely efficient power electronics and is rated to 70°C. The SunKeeper is also certified for use in Class 1, Division 2 hazardous locations, making it an ideal controller for solar powered oil/gas applications.

Features of the Morningstar SK-12 SunKeeper 12A Solar Charge Contoller 12V:

  • High Reliability
    Rated to 70°C to operate in high temperatures at the solar module. More reliable than controllers mounted inside the junction box. Uses very low on-resistance power MOSFET's. No need to re-rate.
  • Outdoor Rated
    ETL approved for outdoor use without an additional enclosure. Rugged IP65, UV resistant case. Epoxy encapsulated printed circuit board and watertight connection to the module junction box.
  • Extensive Electronic Protections
    Fully protected against reverse polarity, short circuit, overcurrent, lightning and transient surges, high temperature and reverse current at night.
  • Longer Battery Life
    Series PWM with 3 stage charging: bulk, PWM regulation and float. Includes temperature compensation at the controller or alternatively at the battery when using optional remote temperature sensor. Able to charge a zero voltage battery.
  • Rated for Hazardous Locations
    Specifically designed for solar power systems in the oil/gas industry. Approved for use in Class 1, Division 2, Groups A,B,C,D.
  • More Information
    Bi-color LED is easy to read from the ground when the solar module is pole-mounted. Indicates solar charging, regulation, normal nighttime operation and any controller or system faults.
  • Easy to Install
    Fits standard half inch conduit knockout (PG 13.5, M20) in module junction box. Quickly fastens with included locknut. Wires have fork connectors for easy connection to solar module terminals.

Also Known As:
SK 12

Morningstar SK-12 SunKeeper 12A Solar Charge Contoller 12V Electrical Specifications

Rated Solar Input:

6 amps
12 amps
Nominal System Voltage 12 Volts
Min. Battery Voltage 0 Volts
Max. Solar Voltage 30 Volts
Self-Consumption Charging...7 mA
Night ........2 mA
Voltage Accuracy ± 150 mV

Battery Charging

Regulation Voltage 14.1 Volts (at 25°C)
Float Voltage 13.7 Volts (at 25°C)
Type of Charging Series PWM
3 stage: bulk, PWM and float
Temperature Compensation (3 choices)
Reading temp at controller -30 mV / °C
Attaching remote temp sensor -30 mV / °C
Disable temp comp Defaults to 25°C
Ability to Charge a Zero Voltage Battery

Electronic Protections

  • Reverse Polarity
  • Short Circuit
  • Overcurrent
  • Lightning and Transient Surges
  • High Temperature
  • Reverse Current at Night

Environmental Specifications

Operating Temperatures -40°C to +70°C
Humidity 100%
Tropicalization Encapsulated in epoxy UV resistant plastic enclosure Conduit connection with rubber gasket seal

Mechanical Specifications

Dimensions 99 x 51 x 13 mm
(3.9 x 2.0 x 0.5 inches)
Weight 0.11 kg / 0.25 lbs
Enclosure IP65
Fitting to Module J-box PG 13.5, M20, 1/2 inch conduit
Wire Size 2.0 mm2 (#14 AWG)
Wire Terminations #8 fork connectors

Bi-color LED

Green Blink 3 Times Successful installation
Green On Solar charging battery
Green Blink Fast In regulation
Green Blink Slow Normal nighttime operation
Red On Controller damaged
Red Blink System problem
LED Off No power


  • CE Compliant
  • Hazardous Locations:
    • Class 1, Division 2, Groups A-D,
    • UL 1604
    • CSA 22.2 No. 213-M1987
  • Complies with U.S. National Electric Code
  • Manufactured in a Certified ISO 9001 Facility
Note: Specifications and pricing of the Morningstar SK-12 SunKeeper 12A Solar Charge Contoller 12V subject to change without notice. Illustrations and descriptions of the Morningstar SK-12 do not claim to be complete or exhaustive.

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