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How much does it cost to fill a cylinder of oxygen using PSA oxygen?

For PSA oxygen generators, the cost for oxygen production, or cylinder filling is normally stated in kilowatt hours (KWH). The reason being that the air is free, but there is a cost of electricity to operate the air compressor. At a sea level site elevation, it will cost about 10 KWH to fill a 6m3 size oxygen cylinder, or 1.5 KWH per M3.