The all new EF6300iSDE is the most powerful, most advanced Yamaha inverter generator ever. It quietly cranks out up to 6,300 watts of pure sine wave inverter power at 120 or 240 volts. Confidently run high-demand equipment like pumps and RV air conditioners, as well as sensitive equipment like plasma TVs and computers. The advanced features we packed into the EF6300iSDE, including electric start makes it a pleasure to use.