Just thinking about total wattage. Headlight - 60, taillight - 5, miscellaneous - maybe 10, heated grips - 35, electric vest - 55. In truth I've never run the vest on maximum output but it's a cycling controller so when it's on, it's on. So, that's 165 watts. Don't know how much more capacity remains but at riding speeds, it will hold 13.5-14 volts with all that stuff on.