29-345 88 Austin Demand Calc 2012-09-259/25/12 PVWatts v.2: AC Energy and Cost Savings
1/1rredc.nrel.gov/solar/calculators/PVWATTS/version2/pvwattsv2.cgi
* * * * *
AC Energy
&
Cost Savings
* * * * *
Estimated output for Ronald Grise, 88 Austin Circle, Florence, MA
Station Identification
Cell ID:0271366
State:Massachusetts
Latitude:42.3 ° N
Longitude: 72.5 ° W
PV System Specifications
DC Rating:8.64 kW
DC to AC Derate Factor:0.706
AC Rating:6.10 kW
Array Type:Fixed Tilt
Array Tilt:32.0 °
Array Azimuth:180.0 °
Energy Specifications
Cost of Electricity: 13.6 ¢/kWh
Results
Month
Solar
Radiation
(kWh/m2/day)
AC
Energy
(kWh)
Energy
Value
($)
1 2.72 532 72.34
2 3.55 627 85.25
3 4.62 869 118.16
4 4.86 852 115.85
5 5.25 915 124.41
6 5.42 882 119.93
7 5.34 889 120.88
8 5.26 878 119.38
9 4.72 783 106.46
10 3.97 717 97.49
11 2.71 490 66.63
12 2.41 459 62.41
Year 4.24 8891 1208.91
Output Hourly Performance Data
(Gridded data is monthly, hourly output not available.)
Output Results as Text
Saving Text from a Browser
Run PVWATTS v.2 for another location Run PVWATTS v.1
Please send questions and comments to Webmaster
Disclaimer and copyright notice.
RReDC home page (http://rredc.nrel.gov )
1/1rredc.nrel.gov/solar/calculators/PVWATTS/derate.cgi
If the default overall DC to AC derate factor of 0.77 is not appropriate for your PV system, you
may use this calculator to determine a new value by changing one or more of the component derate
factors in the table and clicking the "Calculate Derate Factor" button. You may enter values within
the ranges shown in the table. Values outside the ranges are reset to to the default values by the
derate calculator. The new overall DC to AC derate factor may be hand entered, or copied and
pasted, into the "DC to AC Derate Factor" field on the PV Systems Specifications section of the
PVWATTS input form. Click on HELP below the table for information about DC to AC derate
factors.
Calculator for Overall DC to AC Derate Factor
Component Derate Factors Component
Derate Values
Range of
Acceptable Values
PV module nameplate DC rating .95 0.80 - 1.05
Inverter and Transformer 0.96 0.88 - 0.98
Mismatch 0.98 0.97 - 0.995
Diodes and connections 0.995 0.99 - 0.997
DC wiring 0.98 0.97 - 0.99
AC wiring 0.99 0.98 - 0.993
Soiling 0.95 0.30 - 0.995
System availability 0.98 0.00 - 0.995
Shading .88 0.00 - 1.00
Sun-tracking 1 0.95 - 1.00
Age 1 0.70 - 1.00
Overall DC to AC derate factor 0.706
Calculate Derate Factor
Return to RReDC homepage (http://www.nrel.gov/rredc )
Solar Access and Shade Report
9/25/2012
For:
Ronald Grise
88 Austin Circle
Florence, MA
By:
Samara Levine
Measurements made by Solmetric SunEye™ -- www.solmetric.com
Session Properties
Name grise
Creation Date 4/16/2012 8:25
Note (none)
Location
42.3°N, 72.6°W
Mag Dec: 14.3°W
Time Zone: GMT-05:00
Solar access averages of 3 skylines in this session
Skylines Averaged: Sky01, Sky02, Sky03
Annual May-Oct Nov-Apr
88%88%88%
TSRF averages of 3 skylines in this session: 88%
Skylines
Sky01 - (no skyline note)
Sky02 - (no skyline note)
Sky03 - (no skyline note)
Sky01 -- 4/16/2012 8:27 -- (no skyline note)
Panel Orientation: Tilt=35° -- Azimuth=180° -- Skyline Heading=182°
Solar Access: Annual: 87% -- Summer (May-Oct): 87% -- Winter (Nov-Apr): 87%
TSRF: 87% -- TOF: 100%
Sky02 -- 4/16/2012 8:29 -- (no skyline note)
Panel Orientation: Tilt=35° -- Azimuth=180° -- Skyline Heading=180°
Solar Access: Annual: 90% -- Summer (May-Oct): 91% -- Winter (Nov-Apr): 88%
TSRF: 90% -- TOF: 100%
Sky03 -- 4/16/2012 8:31 -- (no skyline note)
Panel Orientation: Tilt=35° -- Azimuth=180° -- Skyline Heading=183°
Solar Access: Annual: 86% -- Summer (May-Oct): 86% -- Winter (Nov-Apr): 87%
TSRF: 86% -- TOF: 100%