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PV Solar Spreadsheet Enter values into shaded cells only. Cells bordered in red are calcul

Facility Name Here

Proposed PV System Electricity Generation and Electricity Rate

Average Annual Electricity Consumed kWh

Percentage of Electricity to Be Replaced by PV (0 to 100) %

PV System Annual Supply (based on percentage above) 0 kWh/yr.

Price (in cents) per kWh for electric service 11.00 cents/kWh

Site Shading Characteristics Acceptable Value Range

Annual percent of solar access available Shading Value Note: Shadi

Shading Derate Factor 0.00 - 1.00 0.8 A number

with 1.00 being no shading Solar Pathe

Wiley Elect

Solmetric S

Component Derate Factors Acceptable Value Range

PV module nameplate DC rating 0.80 - 1.05 0.950 Note: If th

Inverter and Transformer 0.88 - 0.96 0.920Mismatch 0.97 - 0.995 0.980

Diodes and connections 0.99 - 0.997 0.995

DC wiring 0.97 - 0.99 0.980

AC wiring 0.98 - 0.993 0.990

Soiling 0.30 - 0.995 0.950

System availability 0.00 - 0.995 0.980

Shading (Entered above) 0.80

Sun-tracking 0.95 - 1.00 1.000

Age 0.70 - 1.00 1.000

Overall DC to AC derate factor 0.616

PV Module Average Daily Output Proposed 0.00

PV Module Annual Output Proposed 0.00 kWh/yr.

Use PVWATTS w/ data in red cells to calculate system specifications:

http://rredc.nrel.gov/solar/calculators/PVWATTS/version1/US/Kentucky/

Steps:

(1) Click closest city to your site listed on the Kentucky map

(2) Take a guess at DC Rating and enter (use value in cell C29 above divided by 4.5 as an initial guess)

(3) Enter DC to AC Derate Factor (cell C27)

(4) Decide on Array Type (Fixed Tilt, Single Axis, Double Axis) and enter

(5) For Fixed or Single Axis enter the Array Tilt from horizontal and the Array Aximuth (180.0 being due sout

(6) Enter Price (in cents) per kWh (cell C7)

(7) Press on Calculate

http://rredc.nrel.gov/solar/calculators/PVWATTS/version1/US/Kentucky/http://rredc.nrel.gov/solar/calculators/PVWATTS/version1/US/Kentucky/

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(8) Does Year AC Energy (kWh) calculated match proposed (cell C30)? If not, go

back and change DC rating and/or Array Type until you see the production you

want.

The DC rating entered during your final reiteration is the size of the array that will

be needed to meet your expectations.

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ated values. Numbers in shaded cells are default values that can be changed.

ing varies greatly enter shade derating based on your specific site assessment.

f Solar Site Analysis Tools are availabe for determining shading.

rfinder: www.solarpathfinder.com

ronics Acme Solar Site Evaluation Tool www.we-llc.com

unEye www.solmetric.com

se component system factors (except shading) are not known use the given default values

)

http://www.solarpathfinder.com/http://www.we-llc.com/http://www.solmetric.com/http://www.solmetric.com/http://www.we-llc.com/http://www.solarpathfinder.com/