There are newer controllers for the heated grips that pulse a digital signal and do not draw the entire 45 watts. You might get one of those and cut your consumption down a little. As a rule of thumb I usually try to leave 100 watts to run the bike. With this bike you have the fuel pump, injector, computer, electronic ignition etc...62 watts may be undercutting the bike....meaning it may run for a long time but the charging system may not be covering the load...thus the battery will draw down over time. What we need are some specs on the current draw from the running systems of the bike. Also if you are drawing the full amount you are also cutting into your engine power and fuel mileage.
My intuition nearly makes up for my lack of good judgement.
Just installed my new trolling motor