The Pro 300, Big Blue 400 and Big Blue 500 low-speed, diesel engine welding generators offer 1,800-rpm operation and amperage outputs of 300 to 500 amps at 100-percent duty cycle. Ideal for multiprocess (CC/CV) output needs, the Pro 300 has a list price of $9,711. Replacing the Big Blue 302, 402 and 502, Big Blue models feature a control panel that is easier to understand. Engine drives are covered by a 3-year factory warranty; engines are covered separately by the manufacturer for 3 years.