The first part of this work undertakes to design and develop a special hybrid roof-top PV system which is capable of operating both in grid-off and grid-on regime. The PV system is developed in single-phase and three-phase configuration utilizing only commercially available technological components. The single-phase configuration is supposed to serve households with low installed power of AC loads whereas the three- phase system is supposed to be supplying electricity to households with high installed power of AC loads. The PV systems are developed in an attempt to maximize the utilization of the systems' energy yield for the self-consumption of the households. In the second part of this work we perform several system energy yield simulations in the HOMER Legacy and PVSYST software tools with the purpose to calculate the expected amount of annual energy produced from the PV systems, the amount of annual energy self-consumed in AC loads and the amount of annual energy sold into the grid. Based on these results and other specifically defined technical and economic inputs we are able to construct an economic valuation model, which subsequently allows us to assess the economic feasibility of both developed hybrid PV systems in the current conditions of Slovakia. According to the results, the single-phase PV system fails to pass the criteria of economic feasibility mainly because of its high investment costs and insufficient level of FiT support. On the other hand, the three-phase PV system proves to be economically feasible even with the existing conditions. We have also performed a sensitivity analysis to explore the future potential of both PV systems being commercially deployed in larger scale.