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I have a SmartShunt. Time remaining should be based on Ah power consumed in and out and averaged over the time specified in the settings. In my case this is set to the maximum 12 minutes (not nearly adequate). When my fridge is on I will get power drawn and time remaining will show. Once the fridge stops drawing power and the solar panels are feeding in, the time remaining disappears. Almost like it’s an instantaneous reading. If it were averaging this would not happen straight away.
when the battery is charging the time remaining is unknown.
It's the way the software works. Not whether it's theoretically possible.
"The battery monitor estimates how long the battery can support the present load. This is the “time-to-go” readout and is the actual time left until the battery is discharged to the set “discharge floor”. The discharge floor is by default set at 50%. For the discharge floor setting see the Discharge floor chapter. If the load is fluctuating heavily, it is best not to rely on this reading too much, as it is a momentary readout and should be used as a guideline only. We recommend the use of the state of charge readout for accurate battery monitoring.
If the “Time remaining” indicates three dashes: “---” this means that the battery monitor is in an unsynchronised state."
