45KW AC PVWatts Calculator.pdf
PDF 140 KB Posted
- Solicitation number
- RFP 785 2100000267 1
- Issued by
- Madison County, Kentucky
About this file
This file is a PVWatts Calculator analysis prepared by the National Renewable Energy Laboratory (NREL) for the U.S. Department of Energy (DOE). The document presents photovoltaic system performance projections for a proposed 45 kilowatt AC solar installation located in Richmond, Kentucky. The analysis includes monthly and annual energy output estimates, solar radiation data, and system specifications for a fixed roof-mounted array designed to support commercial energy generation objectives.
The projected system will generate an average of 63,251 kilowatt-hours annually, with an expected output range of 59,816 to 65,920 kWh per year based on 30 years of historical weather data for the location. The DC system size is specified at 52.65 kW with a DC to AC size ratio of 1.2, array tilt of 5 degrees, and azimuth orientation of 150 degrees, resulting in a capacity factor of 13.7 percent. At an average retail electricity rate of $0.081 per kilowatt-hour, the projected annual value of generated energy is $5,118. The analysis assumes standard commercial module types, fixed rack installation, 96 percent inverter efficiency, and 14.08 percent system losses. NREL's disclaimer notes that the modeling tool provides estimates subject to inherent assumptions and uncertainties and does not account for variations between different PV technologies or site-specific characteristics beyond the specified inputs.
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Caution: Photovoltaic system performance predictions calculated by PVWatts® include many inherent assumptions and uncertainties and do not reflect variations between PV technologies nor site-specific characteristics except as represented by PVWatts® inputs. For example, PV modules with better performance are not differentiated within PVWatts® from lesser performing modules. Both NREL and private companies provide more sophisticated PV modeling tools (such as the System Advisor Model at https://sam.nrel.gov) that allow for more precise and complex modeling of PV systems.
The expected range is based on 30 years of actual weather data at the given location and is intended to provide an indication of the variation you might see. For more information, please refer to this NREL report:
The Error Report.
Disclaimer: The PVWatts® Model ("Model") is provided by the National Renewable Energy Laboratory ("NREL"), which is operated by the Alliance for Sustainable Energy, LLC ("Alliance") for the U.S.
Department Of Energy ("DOE") and may be used for any purpose whatsoever.
The names DOE/NREL/ALLIANCE shall not be used in any representation, advertising, publicity or other manner whatsoever to endorse or promote any entity that adopts or uses the Model. DOE/NREL/ALLIANCE shall not provide any support, consulting, training or assistance of any kind with regard to the use of the Model or any updates, revisions or new versions of the Model.
YOU AGREE TO INDEMNIFY
DOE/NREL/ALLIANCE, AND ITS AFFILIATES,
OFFICERS, AGENTS, AND EMPLOYEES
AGAINST ANY CLAIM OR DEMAND,
INCLUDING REASONABLE ATTORNEYS'
FEES, RELATED TO YOUR USE, RELIANCE,
OR ADOPTION OF THE MODEL FOR ANY
PURPOSE WHATSOEVER. THE MODEL IS
PROVIDED BY DOE/NREL/ALLIANCE "AS IS"
AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING BUT NOT
LIMITED TO THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE EXPRESSLY
DISCLAIMED. IN NO EVENT SHALL
DOE/NREL/ALLIANCE BE LIABLE FOR ANY
SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER,
INCLUDING BUT NOT LIMITED TO CLAIMS
ASSOCIATED WITH THE LOSS OF DATA OR
PROFITS, WHICH MAY RESULT FROM ANY
ACTION IN CONTRACT, NEGLIGENCE OR
OTHER TORTIOUS CLAIM THAT ARISES OUT
OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THE MODEL.
The energy output range is based on analysis of 30 years of historical weather data for nearby , and is intended to provide an indication of the possible interannual variability in generation for a Fixed (open rack) PV system at this location.
63,251 kWh/Year*RESULTS
System output may range from 59,816 to 65,920 kWh per year near this location.
Month Solar Radiation ( kWh / m2 / day )
AC Energy ( kWh )
Value
January 2.28 3,057 247
February 3.00 3,577 289
March 4.03 5,154 417
April 5.38 6,335 513
May 6.07 7,155 579
June 6.71 7,505 607
July 6.32 7,225 585
August 6.05 6,917 560
September 5.13 5,735 464
October 3.80 4,613 373
November 2.83 3,494 283
December 1.90 2,484 201
Annual 4.46 63,251 $ 5,118
Location and Station Identification
Requested Location Richmond, Ky
Weather Data Source Lat, Lon: 37.73, -84.3 1.3 mi
Latitude 37.73° N
Longitude 84.3° W
PV System Specifications (Commercial)
DC System Size 52.65 kW
Module Type Standard
Array Type Fixed (roof mount)
Array Tilt 5°
Array Azimuth 150°
System Losses 14.08%
Inverter Efficiency 96%
DC to AC Size Ratio 1.2
Economics
Average Retail Electricity Rate 0.081 $/kWh
Performance Metrics
Capacity Factor 13.7%
File details come from the government source that posted it. Updated .