I invite you to investigate US Patent #5,656,919 issued on Aug 12,1997 to "Cruising Equipment Company". Just go to the US Patent website. It clearly lays out the SOC calculation used in the Xantrex type Battery monitors.I thought it was a competitor to the Smart Gauge then realized they have no competition. Yet.
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This is by far the most accurate SOC calculation on the market. Smart Gauge does not even come close.
Clearly the Smart Gauge could not use the above calculation because it was patent protected. That means they had to do something else. There is no doubt that Smart Gauge playes second fiddle.