I think it would depend on how accurate you want to be. If you just want to know if the charge sources are keeping ahead of the usage amps out and in should be enough to know. If you want 2% results that's different.
I have a Victron BVM-700 which is pretty good at tracking of both discharge and charge over time. But I find that after being out for a week's cruise that I need to reset it to "full" once back at the dock and having gone through a charge only cycle.There are several things that can affect the battery monitor prematurely arriving at 100% SOC during a dynamic charge/discharge situation: battery terminal voltage and time at that voltage; battery current and time at that current; Peukert exponent for discharge; recharge "efficiency" (which may be different than the Peukert factor for discharge.
You can probably tune the thresholds and timeout factors in most battery monitors to overcome dynamic charging/discharging, but a simple amps in amps out during charging while motoring may be the best.
John A
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Posted by: John Acord <jcacord@gmail.com>
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