Xantrex Technology Link 1000 - Manual (Page 55)

Battery History
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Parameters have been met) since the last time it was reset to
the factory defaults. A discharge of less than 10% of battery
capacity is not counted as a “cycle”.
–999: Deepest Discharge This is the deepest discharge in Ah
since the last time the Link 1000 was reset to the factory
defaults.
i999: Average Discharge This is the average of all discharges
as an Ah value since the last reset to factory defaults. For best
battery life, you should not routinely discharge more than
50% of your battery’s capacity. If you do, you shorten its life.
An average discharge of 500Ah on a 900Ah battery is
demanding but not unreasonable. An average discharge of
180Ah from a 200Ah battery is excessive and will shorten the
battery’s life.