Sealey inverters 230v with accessory kit sealey mw200a a 200a inverter from sealey with accessory kit lightweight powerful and incredibly versatile this inverter offers many advantages over traditional transformer type welders inverters use state of the art electronic components to produce fully portable power sources for arc welding for example mw200a will produce up to 200amps at 40 duty cycle manufactured from pressed steel with a powder coated finish for extra corrosion resistance