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Morningstar Corporation SureSine-300 Inverter

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Morningstar Corporation:
  • Over 20 years experience designing inverters and charge controllers
  • Industry-leading reliability

Product Information

Model Part No. Watts Input
Type Size & Weight Price
Morningstar Corporation SureSine-300 Inverter2680215300W12VDC115VACPure sine wave6.0 × 8.4 × 4.1 in
10 lbs
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Do you have questions about our Morningstar inverters, or questions about solar in general? Give us a call at 1-800-472-1142.


The Morningstar SureSine SI-300-115V-UL is an ideal inverter for small off-grid systems including cabins, RVs, boats, and remote power systems for telecommunications and other off-grid applications. Morningstar equipment is especially popular in the telecommunications industry due to exceptional reliability, an efficient design, and low radio frequency interference.

The Morningstar SureSine inverter accepts 12Vdc input and outputs 300 watts of continuous 115Vac sinewave power with 600 watts of surge capacity on tap. This is an ideal inverter for applications with relatively small AC power requirements such as lighting in an off-grid home. These inverters are commonly used to power radios and other remote equipment where AC power is needed in addition to 12 volt battery power. Morningstar’s proven track record and the robust design of the Suresine 300 ensures years of reliable operation.

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Features & Attributes

  • Dimensions (LxWxH): 6.0 × 8.4 × 4.1 inches
  • Weight: 10 lbs
  • Pure Sine Wave - Quality AC equivalent to grid power, extends the life of the household appliances (lights, TV, fans) and improves load performance.
  • Toroidal transformer design – Generates good wave form throughout the range of input voltages.
  • Outstanding Surge Capability – Handles up to a 200% surge during load start-up and a maximum of 600 watts.
  • High efficiency - High peak efficiency reduces heating and makes more solar energy available for powering loads.
  • Low Self-Consumption - The SureSine consumes 450mA while powering loads. During no load conditions, the SureSine automatically powers down to stand-by mode, conserving solar energy by reducing self-consumption to one tenth of operating consumption.
  • Extensive Electronic Protections - The SureSine protects automatically against faults and user mistakes such as short circuit, overload, high temperature and low voltage disconnect. Recovers automatically from most faults.
  • No Internal Cooling Fan design - Fans often fail in harsh environments and are noisy, consume power and blow dirt into the electronics.
  • Suitable For Tropical Regions - The SureSine protects against harsh tropical and marine environment by using epoxy encapsulation, conformal coating, stainless steel hardware, and an anodized aluminum enclosure.
  • Remote On/Off - Improves safety, easy to install the SureSine in an inaccessible location or enclosure, and reduces system cost by avoiding the need to add an AC safety disconnect to the system.
  • Adjustability - Four DIP switches for easy adjustability of several system parameters. Additional adjustability via an RJ-11 to RS-232 adapter to a personal computer using Morningstar's PC software
  • MPN: SI-300-115V-UL
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Morningstar Corporation SureSine-300 Inverter

Spec. Sheet
Installation Manual
Country of Origin Certification
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About Morningstar Corporation

Morningstar Corporation is a world-leading manufacturer and supplier of solar charge controllers and inverters. Since their inception in 1993, over 2.5 million Morningstar units have been installed in over 112 countries around the world. Morningstar controllers and inverters have set new standards in performance, quality, reliability and innovative features, and global solar markets have consistently recognized Morningstar's products as the industry's best overall customer value.

Manufacturing is conducted in a fully-automated, world-class ISO 9001 facility, and quality control includes 100% functional testing on every product, using the latest computerized test equipment and processes.

For over 20 years, Morningstar has preserved its ownership, management and strategy, which has allowed the company to build trusted, long-term relationships with its employees, customers and suppliers.

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