Electric Power question?
An electric wheelchair is powered by TWO 12 V lead acid batteries and an electric motor rated at a maximum output power of 1 hp. Each battery has an energy capacity of 600 W-hrs. The motor has an efficiency rating of 85%. Assuming that the batteries are fully charged, for how many minutes can the motor deliver the rated output power before the batteries must be recharged?
Output = 1 hp = 746 watts
Energy from source = 2 * 600 = 1200 watt-hours
Since efficiency = 85%, then
Input = 746/0.85 = 877.65 watts
Time = 1200/877.65
Time = 1.37 hours = 82 minutes
Hope this helps.
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