Dark (bright) steady-state spatial solitons are predicted in one dimension for a series circuit consisting of two photorefractive crystals of which at least one must be photovoltaic. Each crystal can support a spatial soliton. The two solitons are known collectively as a separate spatial soliton pair with three types: bright-bright, bright-dark and dark-dark. In the limit in which the spatial extent of the optical wave is much less than the width of the crystal, the dark soliton can affect the other soliton whereas the bright soliton cannot affect the other soliton in the soliton pair.