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Calculations

10 Panel System

ENERGY OUTPUT (kWh/day) = AREA OF PV ARRAY (m2) * CONVERSION EFFICIENCY (%) * AVAILABLE ENERGY (kWh/m2/day)

Similar usage price = Lowest Rate * Energy Output

Cost of System = Purchase Cost * (1 - Federate Credit Rate) * MIN($2,500, $0.50 * kWh size, Purchase Cost * State Credit Rate)

ROI = Cost of System / Monthly Usage Cost

16 Panel System

ENERGY OUTPUT (kWh/day) = AREA OF PV ARRAY (m2) * CONVERSION EFFICIENCY (%) * AVAILABLE ENERGY (kWh/m2/day)

Similar usage price = Lowest Rate * Energy Output

Cost of System = Purchase Cost * (1 - Federate Credit Rate) * MIN($2,500, $0.50 * kWh size, Purchase Cost * State Credit Rate)

ROI = Cost of System / Monthly Usage Cost

10 Panel System

ENERGY OUTPUT (kWh/day) = AREA OF PV ARRAY (m2) * CONVERSION EFFICIENCY (%) * AVAILABLE ENERGY (kWh/m2/day)

Similar usage price = Lowest Rate * Energy Output

Cost of System = Purchase Cost * (1 - Federate Credit Rate) * MIN($2,500, $0.50 * kWh size, Purchase Cost * State Credit Rate)

ROI = Cost of System / Monthly Usage Cost

16 Panel System

ENERGY OUTPUT (kWh/day) = AREA OF PV ARRAY (m2) * CONVERSION EFFICIENCY (%) * AVAILABLE ENERGY (kWh/m2/day)

Similar usage price = Lowest Rate * Energy Output

Cost of System = Purchase Cost * (1 - Federate Credit Rate) * MIN($2,500, $0.50 * kWh size, Purchase Cost * State Credit Rate)

ROI = Cost of System / Monthly Usage Cost


NASA Data

Parameters for Tilted Solar Panels:
Monthly Averaged Radiation Incident On An Equator-Pointed Tilted Surface (kWh/m2/day)
Lat 42.734
Lon -71.325
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Average
SSE HRZ 1.81 2.68 3.65 4.48 5.17 5.48 5.66 5.01 4.11 2.95 1.91 1.54 3.70
K 0.47 0.50 0.48 0.47 0.47 0.47 0.50 0.50 0.50 0.49 0.45 0.45 0.48
Diffuse 0.71 0.99 1.45 1.95 2.32 2.48 2.35 2.04 1.58 1.14 0.80 0.63 1.54
Direct 3.40 4.15 4.39 4.33 4.54 4.68 5.21 4.91 4.70 4.12 3.22 3.04 4.23
Tilt 0 1.80 2.62 3.61 4.46 5.13 5.50 5.60 4.98 4.04 2.93 1.89 1.54 3.68
Tilt 27 2.87 3.63 4.35 4.75 5.10 5.24 5.49 5.17 4.67 3.87 2.84 2.55 4.22
Tilt 42 3.26 3.94 4.46 4.60 4.76 4.80 5.07 4.92 4.69 4.12 3.16 2.93 4.23
Tilt 57 3.46 4.02 4.34 4.23 4.20 4.16 4.41 4.44 4.47 4.15 3.31 3.14 4.03
Tilt 90 3.19 3.43 3.32 2.85 2.57 2.48 2.60 2.83 3.24 3.45 2.98 2.96 2.99
OPT 3.48 4.02 4.46 4.76 5.22 5.51 5.66 5.20 4.71 4.17 3.31 3.18 4.48
OPT ANG 65.0 55.0 42.0 24.0 13.0 5.00 10.0 20.0 36.0 51.0 61.0 67.0 37.3
  NOTE: Diffuse radiation, direct normal radiation and tilted surface radiation are not calculated when the clearness index (K) is below 0.3 or above 0.8.

Minimum Radiation Incident On An Equator-pointed Tilted Surface (kWh/m2/day)
Lat 42.734
Lon -71.325
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Average
SSE MIN 1.54 2.15 3.23 3.53 4.11 4.53 5.00 4.51 3.50 2.49 1.54 1.20 3.11
K 0.40 0.40 0.43 0.37 0.37 0.39 0.44 0.45 0.43 0.41 0.36 0.35 0.40
Diffuse 0.73 1.04 1.49 1.96 2.32 2.49 2.42 2.10 1.65 1.19 0.80 0.63 1.57
Direct 2.80 3.23 3.74 2.96 3.06 3.39 4.47 4.34 3.82 3.36 2.30 2.10 3.30
Tilt 0 1.53 2.10 3.19 3.51 4.08 4.54 4.95 4.49 3.44 2.47 1.53 1.20 3.09
Tilt 27 2.30 2.74 3.76 3.67 4.03 4.36 4.85 4.62 3.88 3.13 2.13 1.80 3.44
Tilt 42 2.57 2.91 3.82 3.53 3.77 3.99 4.48 4.40 3.86 3.28 2.32 2.01 3.42
Tilt 57 2.69 2.94 3.70 3.25 3.36 3.50 3.93 3.98 3.66 3.27 2.39 2.12 3.23
Tilt 90 2.45 2.47 2.82 2.22 2.14 2.18 2.38 2.57 2.66 2.68 2.11 1.95 2.39
OPT 2.70 2.94 3.83 3.68 4.13 4.56 5.00 4.66 3.89 3.30 2.39 2.13 3.60
OPT ANG 62.0 52.0 40.0 22.0 11.0 5.00 10.0 19.0 33.0 48.0 58.0 63.0 35.1
  NOTE: Diffuse radiation, direct normal radiation and tilted surface radiation are not calculated when the clearness index (K) is below 0.3 or above 0.8.

Maximum Radiation Incident On An Equator-pointed Tilted Surface (kWh/m2/day)
Lat 42.734
Lon -71.325
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Average
SSE MAX 2.13 3.21 4.07 5.28 5.97 6.26 6.48 5.69 4.65 3.44 2.21 1.83 4.27
K 0.55 0.59 0.54 0.55 0.54 0.53 0.57 0.56 0.57 0.57 0.52 0.53 0.55
Diffuse 0.63 0.83 1.35 1.79 2.18 2.36 2.16 1.88 1.45 1.01 0.74 0.57 1.42
Direct 4.33 5.33 5.14 5.69 5.82 5.89 6.40 5.94 5.58 5.14 4.07 3.99 5.27
Tilt 0 2.12 3.14 4.03 5.25 5.92 6.28 6.42 5.66 4.58 3.41 2.19 1.83 4.24
Tilt 27 3.60 4.60 4.96 5.69 5.92 5.98 6.30 5.92 5.39 4.72 3.46 3.26 4.99
Tilt 42 4.15 5.06 5.12 5.53 5.50 5.47 5.79 5.64 5.45 5.09 3.91 3.81 5.04
Tilt 57 4.46 5.22 5.01 5.09 4.83 4.69 5.00 5.08 5.22 5.17 4.13 4.13 4.83
Tilt 90 4.18 4.52 3.85 3.38 2.87 2.70 2.85 3.18 3.78 4.34 3.77 3.96 3.61
OPT 4.51 5.22 5.12 5.69 6.04 6.30 6.50 5.95 5.46 5.18 4.15 4.21 5.36
OPT ANG 66.0 58.0 43.0 26.0 13.0 5.00 10.0 21.0 37.0 54.0 63.0 69.0 38.6
  NOTE: Diffuse radiation, direct normal radiation and tilted surface radiation are not calculated when the clearness index (K) is below 0.3 or above 0.8.