We discuss in this paper the development of inexpensive, high efficiency, large-area solar cells of the type thin-film ZnO/CdS/Cu(In,Ga)Se-2. It has been shown recently in research laboratory tests that polycrystalline thin-film cells of this general composition deposited onto inexpensive soda-lime glass substrates have solar-to-electric conversion efficiencies exceeding 17%. These small-area cells were deposited using vacuum technology which is difficult and expensive to scale up in area to square-meter flat-plate modules in a manufacturing arena. We discuss in this paper inexpensive, non-vacuum deposition technology which is inherently scalable to large-area deposition. We pay particular attention to electrodeposition of multilayer binary or ternary selenide precursors to be thermally annealed to form Cu(In,Ga)Se-2 films of appropriate overall composition, elemental grading and smoothness.