Morningstar SureSine Inverter-300W, 115V 60Hz UL

Morningstar SureSine Inverter-300W, 115V 60Hz UL
Morningstar SureSine Inverter-300W, 115V 60Hz UL
Pure sine wave, efficient, and "tropicalized"!
$339.00 List price $366.12
  Customer Reviews (1)

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Item code Brand name Model number Volts Watts Waveform
MORSURSINE300UL Morningstar Corp SI-300-115V-UL 12V 300W Pure
New! Now UL listed.

Morningstar CorporationMorningstar Corporation
Suresine Pure Sine Wave Inverter
300W, 12VDC

Morningstar Suresine 300The SureSine™  is a 300 watt pure sine wave 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 SureSine’s combination of performance, features and competitive price provides the best small inverter value on the market.

The SureSine’s combination of performance, features and competitive price provides the best small inverter valueon the market. It is highly reliable, having no internal cooling fan or other moving parts prone to failure.


Advantages Compared to Other Small Off-Grid Inverters


  • Pure Sine Wave – Provides quality AC power equivalent to the grid.
  • Toroidal Transformer Design – Generates good wave form throughout the range of input voltages.
  • Outstanding Surge Capability – Handles up to 200% surge during load start-up.
  • High Efficiency – Has a high peak efficiency of 92%.
  • Low Self Consumption – Consumes only 450mA while powering loads.  Automatic stand-by mode reduces consumption to only 55mA.
  • Extensive Electronic Protections – Automatic protection against faults and user mistakes including short circuit, overload, high temperatures and low voltage.  Recovery from protections is automatic.
  • No Internal Cooling Fan – Eliminates a key failure mode and reduces noise, self-consumption and dirt blowing into the electronics.
  • Tropicalization – Protected against harsh tropical and marine environments through the use of epoxy encapsulation, conformal coating, stainless steel hardware and an anodized aluminum enclosure.
  • Adjustability – Several parameters may be adjusted via the DIP switches or by connecting to a personal computer.



Electrical Specifications

Continuous Power Rating 300 Watts @ 25°C
Peak Power Rating (10 minutes)
600 Watts @ 25°C
DC Input Voltage
10.0V – 15.5V
Pure sine wave
AC Output Voltage (RMS)*
220V or 115V +/– 10%
AC Output Frequency*
50 or 60 Hz +/– 0.1%
Peak Efficiency 92%
Total Harmonic Distortion (THD) < 4%
Self Consumption:  
    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)

*Two separate versions available:
220VAC at 50 Hz or 115VAC at 60 Hz
Other output voltages available upon request.

**User selectable on both versions.

Mechanical Specifications

213 x 152 x 105 mm ( 8.4 x 6.0 x 4.1 in)
4.5 Kg / 10.0 lbs
AC Terminals
Max. Wire Size 4 mm2 / 12 AWG
DC Terminals
Max. Wire Size 2.5 to 35 mm2
14 to 2 AWG
Remote On/Off Terminals
Max. Wire Size 0.25 to 1.0 mm2
24 to 16 AWG
IP20 Cast anodized aluminum

Click here to see Morningstar's Two Year Warranty.

Certifications: CE Compliant, UL Listed (UL 458) – 115 V version ONLY, cUL (CSA C22.2 No. 107.1-01) – 115 V version ONLY

Morningstar Corporation

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SureSine 300

I have two of these inverters and am extremely impressed with them. I have years of experience in electronics and working with inverters etc and can honestly say, this inverter is the best made in it's class of my I've come across. They have been operating non stop for over a year now and...
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