As seen in the previous chapters, many parameters must be considered when designing and modeling fuel cells. The calculations involved with designing fuel cell stacks are very basic, but sometimes are unknown to newcomers in the field. The most commonly used stack configuration is the bipolar configuration, which is very similar to how batteries are designed. There are also many alternative stack configurations, however, the materials, designs, and methods of fabricating the components are similar. When considering the design of a fuel cell stack, usually several limitations should be considered. Some of these limitations may include the following: • Size, weight, and volume at the desired power • Cost • Water management • Fuel and oxidant distribution