Solid electrolyte Bi4V1.7Fe0.3O10.7 was obtained by means of polymer-salt composition pirolysis. There were produced three solid oxide fuel cells containing this electrolyte. Two of them have planar model of fuel cell. The configuration of the third cell is similar to the tube model. The planar cells differ from each other only in sealing agents. High temperature glass and Teflon were used as sealing agents in these planar cells. Study of all cells was carried out. EMF equilibrium values of these cells were determined. Low magnitudes of equilibrium EMF were determined for all cells. Possible reasons of these values are the following: not a gasproof electrolyte tablet, not a gasproof junction between the tube and the electrolyte tablet, ions transfer number of electrolyte is far less than 1. Peak powers of all cells were estimated by means of measuring of voltage-current characteristics. Specific power of the tube type cell is relatively less than others because of complication of putting internal electrode (anode) in tube with internal diameter ~ 1,5 mm. Specific power of planar cell with high temperature glass is less than specific power of planar cell with Teflon because of partial spreading of anode by high temperature glass during sealing process.