Quote:
Originally Posted by Night_Sailor
It will calibrate itself when the batteries reach fully charged which might take a few days.
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Or it will simply reset prematurely because solar can easily mimic the "charged parameters" which the battery monitor resets on...
They reset on:
*Voltage
*Time at voltage
*Current
*Time at current
Solar can easily trick a battery monitor into premature resets...
Quote:
Originally Posted by Night_Sailor
Mine took 3 days as I recall. Later mine got out of sync--the percentage discharge did not match the AH used.
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Ah used and % charged rarely if ever line up. This is due to the Peukerts constant setting. The % charged
screen uses the Peukerts constant, the Ah consumed
screen does not. Therefore they can not line up and should not line up exactly...
The only way the two screens line up is if you draw the battery bank at exactly
capacity divided by 20 at 75-80F. This means drawing a 400Ah bank, with the proper Peukerts constant, at 20 amps and holding that current draw steady with a battery temp of 75-80F. Then and only then will the Ah screen (CE/Consumed Energy screen for Victron) and % charged screens agree...
On most cruisng boats % charged screen will usually read higher than the CE screen shows. This is because you are most often drawing current out of the bank at less than C/20 and getting a slight bump in capacity because of it.....
Ah counters require careful user calibration. This calibration with known battery capacity (rarely not the "rating" unless new), known charge efficiency, known Peukerts constant, case temp etc., is critical for them to be even close to accurate.
Because traditional AH counters do not "learn the bank" all they can do is drift out of calibration. You as the owner must teach the battery monitor about your bank then it will be
more accurate. You as the owner should also use "known full" manual resets as often as is possible because "auto synch" is very easy to trick....