Grid tied system sizing
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Grid-Tied System Sizing. Module 11 Fall 2009. Sizing a Grid-Tied PV System. Design Beginning Points Annual Electric Usage Available Space For System Panels and Electrical Budget Constraints. Sizing Process:. Sizing begins at the load side and proceeds backwards to the array

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Grid-Tied System Sizing

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Grid tied system sizing

Grid-Tied System Sizing

Module 11

Fall 2009


Sizing a grid tied pv system

Sizing a Grid-Tied PV System

  • Design Beginning Points

    • Annual Electric Usage

    • Available Space For System Panels and Electrical

    • Budget Constraints


Sizing process

Sizing Process:

  • Sizing begins at the load side and proceeds backwards to the array

  • Grid-Tied systems are usually sized as large as possible within limits of budget and space

  • Sizing of Stand-Alone systems involves a fine balance between energy supply and demand. Not covered in this class.


Accepted method for certification in coseia

Accepted Method for Certification in CoSEIA

  • Electric Load Estimation

    • 1. Approximate monthly and daily average energy use

      • Yearly Average energy consumption: 7000 kWh/yr

      • Avg. kWh/yr ÷12mo = 583 kWh/mo

      • Avg. kWh/mo ÷ 30 days = 19.5 kWh/day

      • This is Average Daily Load


Accepted method for certification in coseia1

Accepted Method for Certification in CoSEIA

  • Electric Load Estimation

    • 1. Approximate monthly and daily average energy use

      • Yearly Average energy consumption: 7000 kWh/yr

      • Avg. kWh/yr ÷12mo = 583 kWh/mo

      • Avg. kWh/mo ÷ 30 days = 19.5 kWh/day

      • This is Average Daily Load


Step 1a

Step 1a

  • 50% of power to be generated by PV

  • 19.5 (AC)kWh/day x 50% of power from PV

    = 9.75 (AC)PV system kWh/day


2 array sizing

2. Array Sizing

  • Average Sun Hours per day…. Denver (5.5 – 6 hours)

    • See Irradiation chart

    • Or data in back of book


Solar radiation chart

Solar Radiation Chart


3 determine pv system kw needed

3. Determine PV system kW needed

9.75 (AC) PV system kWh/day ÷ 5.5 (ASH/day) = 1.77 (AC) PV System Kilowatts


4 factor in inverter efficiency

4. Factor in inverter efficiency

  • 1.77 (AC) PV System Kilowatts ÷ .80 derate factor = 2.21(DC) PV array System kW needed

  • 2.2 kW PV array x 1000 Watts/kilowatt = 2200 PV array watts


From the book

From the Book…

  • Establish design kWh/day

  • Divide by average peak sun hours

  • Factor in Inverter efficiency

  • Choose Modules

  • Inverter Sizing


Inverter sizing

Inverter Sizing

  • Calculate total watts of array

  • Choose inverters that will pass that quantity of watts

  • Check string sizing software to evaluate overall compliance with design criteria

  • Decide how many strings your system will utilize


End of day 2 presentation

End of Day 2 presentation


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