Morningstar SureSine 300 Watt Power Inverter SI-300-115V-UL



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The Morningstar SureSine-300 SI-300-115V-UL is a 300 watt pure sine wave 115V inverter (12 volt DC input) designed specifically for remote off-grid photovoltaic (PV) systems. It is an ideal inverter for rural electrification projects, telecom, remote cabins and weekend homes, and RV or caravans and boats. The Morningstar SI-300-115V-UL SureSine has a combination of performance, features and competitive price which provides the best small inverter value on the market.

Key SureSine-300 Benefits:

No Internal Cooling Fan – a key design objective since fans often fail in harsh environments and are noisy, consume power and blow dirt into the electronics.

Tropicalization – the SureSine uses epoxy encapsulation, conformal coating, stainless steel hardware, and an anodized aluminum enclosure to protect against harsh tropical and marine environments.

More Information – the two LEDs provide important information to the user about system status and any fault conditions. An optional digital meter may be connected to the SureSine to display additional system information.

Remote On/Off – improves safety by making it easy to install the SureSine in an inaccessible location or enclosure. Reduces system cost by avoiding the need to add an AC safety disconnect to the system.

Adjustability – four DIP switches provide easy adjustability of several system parameters. Additional adjustability is possible via RJ-11 to RS-232 adapter to a personal computer and using Morningstar’s PC software.


Morningstar SureSine Part Number: SI-300-115V-UL


SureSine-300 Features:

  • Pure Sine Wave
  • Handles up to 200% surge
  • 55mA self consumption (standby mode)
  • No internal cooling fan
  • Adjustable and Programmable
  • Toroidal transformer design
  • Peak efficiency of 92%
  • Extensive electronic protections with automatic recovery
  • Protected against harsh tropical and marine environment
  • 2 Year Warranty


SureSine-300 Specifications:

  • Continuous Power Rating: 300 Watts @ 25°C
  • Peak Power Rating (10 minutes): 600 Watts @ 25°C
  • DC Input Voltage: 10.0V – 15.5V
  • Waveform: Pure sine wave
  • AC Output Voltage (RMS): 115V +/– 10%
  • AC Output Frequency: 60 Hz +/– 0.1%
  • Peak Efficiency: 92%
  • Total Harmonic Distortion (THD): < 4%
  • Inverter On (no load): 450mA
  • Inverter Off: 25mA
  • Stand-by: 55mA
  • Low Voltage Disconnect (LVD): 11.5 V or 10.5 V
  • Low Voltage Reconnect: 12.6 V or 11.6 V
  • LVD Warning Threshold (buzzer): 11.8 V or 10.8 V
  • LVD Delay Period: 4 minutes
  • High Voltage Disconnect: 15.5 V
  • High Voltage Reconnect: 14.5 V
  • Standby On Threshold: ~ 8 Watts
  • Standby Off Threshold: ~ 8 Watts
  • High Temperature Disconnect: 95°C (heatsink)
  • High Temperature Reconnect: 80°C (heatsink)
  • Dimensions: 8.4″ x 6.0″ x 4.1″ in
  • Weight: 10.0 lbs
  • CE Compliant
  • UL Listed (UL 458) – 115 V version ONLY
  • cUL (CSA C22.2 No. 107.1-01) – 115 V version ONLY




Additional information

Weight10 lbs

2 Year