No worries mate, but I think you're in wattage. :) The MVP, MVP2 and MVP 20w only go up to 5-7.5V. There are cases for using wattage on an MVP/MVP2, but in general you're just giving up fine-grained control (4.0, 4.1, 4.2, 4.3, etc. vs 6, 6.5, 7, 7.5)