top surface of the frame during the frame manufacturing process the inserted alignment features 506 preferably remain above and do not break the glass layer 622 so as to maintain the integrity of the enclosure for the silicon cells alternatively the alignment features 506 may be formed during the extrusion of the frame corresponding female alignment features for example holes or grooves 610 are also formed in the bottom member of the frame these female alignment features 610 are formed on the bottom area of the frame at locations which correspond to and in case of pins and holes coaxially align with the locations of the male alignment features 506 on the top area of the frame as such with these male and female alignment features the module frames may be directly stacked on each other in a secure and interlocked manner in one embodiment one or more of the corresponding holes may also function as drain holes at the bottom of the frame fig7 shows a second profile of a module frame with male and female alignment features in accordance with an embodiment of the invention as shown the frame includes a side member 702 which is coupled to a top member 708 and bottom members 704 and 705 a slot 706 towards the top of the frame is configured to hold and support the photovoltaic cells within the frame the photovoltaic cells form a silicon layer 724 which may be sandwiched between a glass layer 722 and a polymer layer 726 also shown are channels 712 which may be used to provide an anchor for self tapping screws in accordance with an embodiment of the invention male alignment features 506 are included at selected positions to the top surface of the frame the male alignment.