Sep./2008: We have finished 3000W~5000W/modified sine wave inverter, except the home applications use, they can start and work the welding machine & small compressor successfully. We did try the welding machine as the brand/type/voltage: Kemmppi/Minarc 150/230V, Fornius/Trans Pocket 150/230V,….etc., and the compressor as the brand/type/output: Fiac/Pony VX304/1.8KW, Fiac/Cosmos 24/1.5KW,…etc.