BEST FOR HARD VEGETABLES carrots, ginger root, celery. This Breville juicer features a 1200-watt motor The Breville BJE820XL Juice Fountain Duo has five variable speeds, ranging from 6,500 to 13,000 rpm. Most other juicers contain motors ranging between 600 and 1000 watts. Hard, dense foods, such as carrots and celery, are best broken down at high-speed settings, such as 12,000 RPMs. Any setting below this level will not be able to break down the food completely. It will send large chunks of unprocessed wet pulp into the pulp collector instead of properly extracting the juice from it.