A photoelectric panel assembly comprises a photoelectric panel (10) having a front surface for receiving light, and a rear surface opposite the front surface and a support rail (210) coupled to the rear surface of the photoelectric panel (10), wherein the support rail (210) includes a base portion (211), first and second flange portions (218) on either side of the base portion (211) coupled to the rear surface of the photoelectric panel (10) and respective joining portions (215) formed between the base portion (211) and each of the flange portions (218), wherein the angle θ between the base portion (211) and each of the joining portions (215) is between 80° and 130°, wherein at least one of the corners between the base portion (211) and one of the joining portions (215) and between one of the joining portions (215) and the corresponding flange portion (218) are rounded.