Solar PV technology is rarely used as a major source of power in most developing countries. This is partly attributable to the poor conversion efficiency which is less than 30% and high initial installation costs. This study investigates the variation of polycrystalline silicon (pc-Si) PV module parameters when subjected to a static magnetic field equivalent to the earth's magnetic field. The magnitude of the magnetic field B is varied from 0 mT to 0.08 mT. An experimental probe on the variance of the pc-Si solar cell parameters when subjected to B showed that short circuit current (ISC) and current at maximum power point (IMPP) decreased noticeably while open circuit voltage (VOC) and voltage at maximum power point (VMPP) decreased slightly as a result of an increase in B. This led to a considerable decrease in the fill factor (FF) values and the maximum power (PMPP) which consequently led to a 0.21% decrease in the conversion efficiency (h) between the Equator, 0 degrees, and the latitude 50 degrees N/S. The findings revealed an increased module's active area per kilo-watt of 0.08 m(2)/kW of electric power generated translating to installation cost increment of 1.31% due to decreased efficiency. (c) 2020 Elsevier Ltd. All rights reserved. Superscript/Subscript Available