Its really interesting that they can get up to the efficiency of led acid batteries in applications for rural areas. I wonder if maintaining that large air tank

Its really interesting that they can get up to the efficiency of led acid batteries in applications for rural areas. I wonder if maintaining that large air tank is more difficult / costly than maintaining the batteries. Its also interesting that we're only talking about 116 PSI - I'm guessing CFM is more important. > A simulation for a stand-alone CAES aimed at unpowered rural areas, and which is connected to a solar PV system and used for lighting only, operates at a relatively low air pressure of 8 bar and obtains a round-trip efficiency of 60% -- comparable to the efficiency of lead-acid batteries. [7] However, to store 360 Wh of potential electrical energy, the system requires a storage reservoir of 18 m3, the size of a small room measuring 3x3x2 metres. The authors note that “although the tank size appears very large, it still makes sense for applications in rural areas”.