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ECE103���(Extra Credit) Wind Energy System Design

*** Note: Download this PowerPoint to your local drive first, then edit the local file

(do NOT request permission to change my original)

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Assumption:

Wind is only available

50% of the time

Assumption:

Design:+25% capacity

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Home Energy Usage Calculations �(Data from Home Electric Bill)

  • Daily average Energy usage: 36 kWh

( For your assignment, use your electric bills or use 12.5 kWh)

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  • Average Power consumed by my home:
    • Energy = power x time
    • power = Energy / time = 36 kWh /24 h = 1.5 kW

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  • Design power with +25% margin:
    • power(designed) = 1.25 * 1.5 kW = 1.875 kW

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  • Designed Energy usage (with +25% margin) for 24 h:
    • energy(designed) = 1.875 kW * 24 h= 45 kWh

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Energy Required at Battery Bank

  • Given: Inverter (48V to 110V ac) is 90% efficient

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  • Energy required per day at the Battery Bank:

Energy(batt) = 45 kWh / 0.9 = 50 kWh

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  • Calculate Ah required at the Battery Bank:
    • Energy(batt) = power x time = (v x I ) x time

= v x (I x time) = v x Ah

    • Ah = Energy(batt) / v = 50 kWh /48v = 1.042 kAh

= 1042 Ah

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  • Given each battery is rated: 48V, 20 Ah
  • Number of batteries required:
    • n = 1042 Ah / 20 Ah = 52.1 = 53 (round up)

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Calculate the Power of Wind Turbine Required

  • Power required at Battery Charger:
    • energy = power x time
    • power = energy / time = 50 kWh / 24h = 2.084 kW

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  • Assume wind is available only 50% of the time
    • Wind Turbine power required:
      • Pw = 2 x 2.084 kW = 4.167 kW

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  • If GE 1.5 MW Wind Turbine is available,
    • how many homes like yours can be supported?

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    • number of homes = 1.5 MW / 4.167 kW

= 1500 kW / 4.167 kW

= 360 homes