battery charger 56 motor controller 60 inverter 58 and ac cord reel 54 battery charger 56 converts ac current into dc current for use in recharging batteries 52 when green sweep 10 is connected to an ac power source motor controller 60 is used to control the rotational speed of main broom motor 44 the rotational speed of main broom 36 may be lowered to accommodate sweeping lawns or other surfaces that are more delicate or where only light debris need to be swept increasing the rotational speed of main broom 36 is effective in sweeping heavier debris that may be found on paved surfaces such as parking lots inverter 58 is used to convert dc energy stored in batteries 52 into ac energy to operate various ac power tools and equipment that may be found on the market today examples of ac power tools that may be operated by connecting to green sweep 10 include but is not limited to drills miter saws table saws circular saws sanders polishers grinders jointers planers metal shears nailers routers and more examples of ac powered equipment that may be operated by connecting to green sweep 10 include but is not limited to trimmers blowers pole saws edgers chain saws pressure washers log.