These IP66 rated, water proof, pure sine wave inverters build in Canada with very high quality.

They are:

• Pure sine wave exactly duplicates household current.
• Crystal controlled for precise timing for digital clocks and controllers. Controlled ±0.01 Hz.
  
• Isolated, can be used in positive or negative ground applications.
  
• Extra heavy filtering to isolate noise from equipment sharing the same battery
• Ultra quiet with no electrical interference.
• Very rugged and reliable, CSA listed.
• Low voltage warning and shutdown to protect the batteries
• Suitable for operation with lead acid, sealed lead acid, 3 cell lithium ion and 4 cell lithium iron phosphate batteries.
• Thermostatically controlled fan comes on only when needed.
• Manufactured in accordance with COTS standard IPC-A-610.
• Fully Isolated >1500 volts isolation from case to output terminals or between input and output terminals. >500V isolation between input terminals and case
• Meets MIL-Spec loose cargo requirement
• 34.5 dB when fan is operating, Fan comes on when needed
• Standard AC output receptacle and inputs are Screw terminals with cable clamp

This inverter has 'Power Wizard' software. User can select output frequency, output voltage (within ±10 percent of the standard voltage), output frequency (50 or 60 Hz) and low voltage shutdown parameters (to match the battery voltage) from any laptop through the standard micro-usb interface.