Describes test methods for the electrical, thermal and Environmental performance of small stationary fuel cell power systems that meet the following criteria: - output: rated electric power output of less than 10 kW; - output mode: grid-connected/independent operation or stand-alone operation with singlephase AC output or 3-phase AC output not exceeding 1000 V, or DC output not exceeding1500 V; - operating pressure: maximum allowable working pressure of less than 0,1 MPa (gauge) for the fuel and oxidant passages; - fuel: gaseous fuel (natural gas, liquefied petroleum gas, propane, butane, hydrogen, etc.) or liquid fuel (kerosene, methanol, etc.); - oxidant: air.