PV System Simulations – Case 2
PVsyst simulation for latitude of 13 degrees (Chennai) for both East-West and South facing modules, results shown below. East-West @13degrees generation will be almost 2.5% lesser in comparison with South facing@13 degrees (see Fig.4).
100 kWp area utilization comparison: East-West facing array @13degrees requires 839.02 sqm., South facing array @ 13 degrees will require 1115.18 sqm (see fig 5). An increase of 25%.
• Single orientation power generation + 155.1 MWh/year
• Dual orientation power generation + 158.9 MWh/year
• 155.1/158.9 = 2.3% loss
• Single orientation area calculation 40.23 x 27.72 = 1115.18 sqm
• Dual orientation Area calculation 27.25 x 30.79 = 839.02 sqm
• Extra area required for single orientation 839.02/1115.18 = 24.7%
As shown in figure 6; shed loss calculations for a Single (South facing) orientation with inter-row spacing of 2 meters, 13 degrees tilt result in losses of around 0.7%.
• East-West facing solar modules generate an almost equal amount of power as South facing modules, where the latitude is less than 13 degrees.
• For roofs located below a latitude of 13 degrees (South of India), East-West orientation is cost effective whilst power generation will be the same for both orientations (East-West vs South).
• Major advantages regarding required roof area, cable length, etc.
• Investment costs equal for both systems (procurement, manpower, engineering), but resulting in a larger system on the roof in case of dual orientation.
• The (traditional) South facing configuration was cost efficient when the BOS costs were quite low compared to the module costs. In the more recent pricing environment, where the share of PV module costs as a percentage of Capex has dropped significantly, reducing the BOS costs becomes utmost important. An East-West configuration delivers on this BOS cost reduction.