High Wire Networks Inc (HWNI)

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A typical fuel cell produces a voltage from 0.6 V to 0.7 V at full rated load. Voltage decreases as current increases, due to several factors:

Activation loss
Ohmic loss (voltage drop due to resistance of the cell components and interconnections)
Mass transport loss (depletion of reactants at catalyst sites under high loads, causing rapid loss of voltage).[13]
To deliver the desired amount of energy, the fuel cells can be combined in series to yield higher voltage, and in parallel to allow a higher current to be supplied. Such a design is called a fuel cell stack. The cell surface area can also be increased, to allow higher current from each cell. Within the stack, reactant gases must be distributed uniformly over each of the cells to maximize the power output.[14][15][16]

https://en.wikipedia.org/wiki/Fuel_cell