Aims: To outline the necessary steps in the evaluation of solar panel systems in agriculture.Study Design: Using the outline proposed, GaAs and Si solar panels were evaluated under central Texas weather conditions.Place and Duration of Study: Bioenergy Testing Laboratory (BETALab) between January and August 2013 in College Station, Texas. Materials and Methods:The study includes an outline on how to do a technical and simple economic comparison between solar panels.The outline includes the solar panel efficiency, required area, installations and power generation costs and simple payback period.To exhibit the application of the outline, two different photovoltaic systems were compared (silicon (Si) PV panels and the gallium arsenide (GaAs) PV panels).The solar panels were compared simultaneously, taking measurements of voltage and current automatically in College Station, Texas.