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Grid-Tied System Sizing

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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  1. Grid-Tied System Sizing Module 11 Fall 2009

  2. Sizing a Grid-Tied PV System • Design Beginning Points • Annual Electric Usage • Available Space For System Panels and Electrical • Budget Constraints

  3. 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.

  4. 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

  5. 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

  6. 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

  7. 2. Array Sizing • Average Sun Hours per day…. Denver (5.5 – 6 hours) • See Irradiation chart • Or data in back of book

  8. Solar Radiation Chart

  9. 3. Determine PV system kW needed 9.75 (AC) PV system kWh/day ÷ 5.5 (ASH/day) = 1.77 (AC) PV System Kilowatts

  10. 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

  11. From the Book… • Establish design kWh/day • Divide by average peak sun hours • Factor in Inverter efficiency • Choose Modules • Inverter Sizing

  12. 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

  13. End of Day 2 presentation

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