Morningstar SunKeeper SK-6, PWM Charge Controller
Rated Solar Current: 6 Amps
Rated Load Current: None
System Voltage: 12 Volts


Morningstar SK-6 Detailed Description:

Morningstar’s SunKeepersolar 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.

High Reliability
Rated to 70°C to operate in high temperatures at the solar module. More reliable than controllers mounted inside the junction box. Usesvery 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

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.

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.


WARNING – Be very careful when working with batteries.

Lead-acid batteries can generate explosive gases, and short circuits can potentially draw hundreds or thousands of amps from the battery. Do not exceed the voltage or current ratings of the controller. Use only with a 12V battery.

There are no user serviceable parts in the SunKeeper. Do not disassemble or attempt to repair.

The negative system conductor should be properly grounded per U.S. National Electric Code (NEC) guidelines for most effective lightning protection.

Hazardous Locations:

The SunKeeper family of charge controllers has been listed to UL1604 and CSA 22.2 No.213-M1987 for use in Class 1, Division 2, Groups A, B, C and D hazardous locations. In order to comply with the UL and CSA standards, the installation should follow the requirements of the National Electrical Code Article 501-4(b) and/or Canadian Electrical Code Article 18-156 when installing a SunKeeper in a Hazardous (Classified) Location.

System Wiring:

Use copper wire only. Power conductors should be joined or spliced using insulated butt splice solderless crimp connectors or by brazing, welding, or soldering wire ends. If soldered, the spliced joint should be mechanically and electrically secure before soldering. All splices and joints should
be covered with insulation equivalent to that of the conductors.

System Fusing:

The battery positive lead should be fused no further than 12 inches (305 mm) from the battery.

SK-6: 8A fuse
SK-12: 16A fuse