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# Grid-Tied System Sizing - PowerPoint PPT Presentation

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

Module 11

Fall 2009

• Design Beginning Points

• Annual Electric Usage

• Available Space For System Panels and Electrical

• Budget Constraints

• 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.

• 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

• 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

• 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

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

• Or data in back of book

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

• 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

• Establish design kWh/day

• Divide by average peak sun hours

• Factor in Inverter efficiency

• Choose Modules

• 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