Patent ID: 8241799

Claim:
A method of operating a fuel cell power generator including a power generation unit configured to carry out power generation using air and a diluted fuel containing methanol and water, the method comprising: feeding the air and the diluted fuel containing methanol and water to the power generation unit; measuring an output voltage of the power generation unit; changing a flow rate of the diluted fuel to be fed to the power generation unit without changing a concentration of the diluted fuel; determining whether the output voltage increases or decreases in response to the changed flow rate of the diluted fuel; adjusting the concentration of the diluted fuel fed to the power generation unit based on how the output voltage responds to the change in the flow rate of fuel; and returning the changed flow rate of the diluted fuel back to an initial flow rate of the diluted fuel after determining whether the output voltage increases or decreases in response to the changed flow rate of the diluted fuel.