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Insolation PEI

NASA Surface meteorology and Solar Energy - Available Tables  
Latitude 46 / Longitude -63 was chosen (Eastern PEI).

Geometry Information Elevation: 8 meters averaged from the
USGS GTOPO30 digital elevation model
Northern boundary
47
Western boundary
-63
Center
Latitude 46.5
Longitude -62.5
Eastern boundary
-62
Southern boundary
46

Parameters for Sizing and Pointing of Solar Panels
and for Solar Thermal Applications:

Monthly Averaged Insolation Incident On A Horizontal Surface (kWh/m2/day)
Lat 46
Lon -63
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Average
22-year Average 1.35 2.14 3.26 4.30 5.45 6.02 6.02 5.25 3.98 2.41 1.30 1.01 3.54

Minimum And Maximum Difference From Monthly Averaged Insolation (%)
Lat 46
Lon -63
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Minimum -27 -16 -23 -20 -14 -20 -15 -17 -19 -18 -17 -16
Maximum 19 29 27 26 21 19 14 11 12 27 20 20
         

Parameters for Tilted Solar Panels:
Monthly Averaged Radiation Incident On An Equator-Pointed Tilted Surface (kWh/m2/day)
Lat 46
Lon -63
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Average
SSE HRZ 1.35 2.14 3.26 4.30 5.45 6.02 6.02 5.25 3.98 2.41 1.30 1.01 3.54
K 0.42 0.45 0.47 0.46 0.50 0.51 0.53 0.53 0.51 0.44 0.36 0.37 0.46
Diffuse 0.80 1.11 1.67 1.86 2.46 2.58 2.48 2.20 1.79 1.19 0.78 0.64 1.63
Direct 1.92 2.75 3.36 4.36 4.93 5.53 5.74 5.23 4.30 3.00 1.67 1.41 3.69
Tilt 0 1.35 2.10 3.22 4.28 5.40 6.05 6.04 5.22 3.91 2.34 1.29 0.98 3.52
Tilt 31 2.02 2.86 3.86 4.64 5.39 5.74 5.84 5.47 4.57 3.08 1.84 1.45 3.90
Tilt 46 2.20 3.02 3.89 4.48 5.00 5.22 5.35 5.18 4.55 3.21 1.97 1.58 3.81
Tilt 61 2.27 3.03 3.74 4.10 4.39 4.48 4.63 4.66 4.31 3.18 2.00 1.63 3.54
Tilt 90 2.06 2.61 2.96 2.91 2.87 2.86 2.98 3.17 3.28 2.67 1.79 1.49 2.64
OPT 2.27 3.04 3.90 4.65 5.53 6.08 6.10 5.51 4.59 3.22 2.01 1.63 4.05
OPT ANG 62.0 54.0 41.0 27.0 15.0 8.00 10.0 22.0 37.0 51.0 59.0 62.0 37.2
         

 

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Document generated on Fri Oct 9 07:59:43 EDT 2009

Parameter Definition

Monthly Averaged Radiation Incident On An Equator-pointed Tilted Surface

SSE MAX
The monthly average amount of the total solar radiation incident on a horizontal surface at the surface of the earth for the year that has the most, or maximum, monthly averaged value in the 22-year period (Jul 1983 - Jun 2005).
Clearness Index (K)
The monthly average amount of the total solar radiation incident on a horizontal surface at the surface of the earth for the year that has the most, or maximum, monthly averaged value in the 22-year period divided by the monthly average incoming top-of-atmosphere insolation for that month.
Diffuse
The monthly average amount of solar radiation for a given month incident on a horizontal surface at the surface of the earth under all-sky conditions with the direct radiation from the sun's beam blocked by a shadow band or tracking disk for the year that has the least, or minimum, monthly averaged value in the 22-year period.
Direct Normal
The monthly average amount of direct normal radiation incident on a surface oriented normal to the solar radiation for the year that has the most, or maximum, monthly averaged value in the 22-year period.
Tilt 0, Latitude-15, Latitude, Latitude+15, 90
The monthly average amount of the total solar radiation incident on a surface tilted relative to the horizontal and pointed toward the equator for the year that has the most, or maximum, monthly averaged value in the 22-year period. Note that the differences between the Tilt 0 values and the SSE MAX values are due to approximations in the inputs and time integration inaccuracies when processing the equations and integrating over the "monthly average day" (SSE Methodology). Total solar radiation for each tilt angle was determined using SSE MAX in the RETScreen Isotopic Diffuse Method discussed in SSE Methodology.
OPT
The monthly average amount of total solar radiation incident on a surface tilted at the optimum angle relative to the horizontal and pointed toward the equator.
OPT ANG
The angle relative to the horizontal for which the monthly averaged total solar radiation is a maximum.
Units
  • SSE MAX, Diffuse, Direct Normal, and OPT in kWh/m2/day
  • Tilt angles and OPT ANG in degrees
  • K is dimensionless

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