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Abstract-This study discusses the economic utilization of proton exchange membrane fuel cell (PEMFC) based on cost of energy (COE) to supply residential electrical and thermal loads. The fuel cell system is sized using simplified mathematical expressions considering the stack degradation and the system salvage value at the end of its life time. The study is based on a 5 kWh/day residential loads with a peak load power of 1300W. Two scenarios for economic survey are studied. The first scenario is to find the commercial price for each FC component considering that the supply fuel is hydrogen. The other scenario is for a complete FC system commercial price considering that the supply fuel is natural gas. The economic analyses are based on the actual sale prices in the market. The COE of the fuel cell system is compared with previous work by the authors for the same residential ratings but supplied from a stand-alone photo voltaic system (SAPV). The analysis results show that the COE relies heavily on the capital cost of the system. Index Terms-

This paper investigates the effect of varying different operating and design parameters on the sizing and economics of standalone PV systems for residential utilization. Each subsystem is sized using simplified mathematical expressions considering the effecting parameters as input variables. Thus, the sizing and economics of the entire system can be investigated in a generic form. The cost of each system component is analyzed based on international prices and aggregated to obtain the overall cost of energy (COE). The study is based on a 5 kWh/day residential load. A peak load power of 1300W is considered when sizing the inverter capacity. Among the design factors, the battery bank voltage, charge controller type, the solar irradiation and the depth of discharge (DOD) are investigated to examine their effect on the system economy. The analysis results show that the COE relies heavily on both the size and the selected design voltage of the battery bank, which in turn depend on the storage hours, charger size, the (DOD) value and solar irradiation.I.

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