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Air Hybrids

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Hmm.. depends on the specific application. They claim higher input (regen-like) power. Other things to consider are output power, storage (energy) capacity, size/weight of the system, and overall (output/input) efficiency.

My guess is that the storage capacity is rather low. But for a city bus that is stopping frequently, it probably only really needs the capacity to store the energy from one stop to help get going to the next for there to be a worthwhile benefit.