ExelTech - based in USA
Founded in 1990 and based in Texas, USA, ExelTech claim to have been the producer of the first full sinwave inverter on the market.
Product Details
Inverters - A range of full sinewave inverters with outputs upto 2000 watts
A large range of Modular inverters (modules can be added to increase power output upto 40,000 watts), plus grid tied inverters.
Location of ExelTech website - http://www.exeltech.com/