Hi John,
Not sure why you are having to reset to full as you call it. You certainly should not have to do that, unless you've interrupted the power supply in which case you'll need to fully charge to re-sync.
Have you the latest firmware? v3.08 is latest. If not register and get from here:
https://professional.victronenergy.com/
Here's the relevant bits from the manual that should help you solve the problem. Full manual on Victron site.
The BMV does not synchronize automatically
One possibility is that the battery
never reaches the fully charged state.
The other possibility is that the charged voltage setting should be lowered
and/or the tail current setting
should be increased.
2.2
Synchronizing the BMV
For a reliable readout, the state of charge as displayed by the batt
ery monitor has to be synchronized regularly with the true state of charge of
the battery. This is accomplished by fully charging the battery.
In case of a 12V battery, the BMV resets to 'fully charged' when the
following 'charged parameters' are met: the voltage exceeds 13.2V and
simultaneously the (tail-) charge current is less than 4.0% of the total
battery capacity (e.g. 8A for a 200Ah battery) during 4 minutes.
The BMV can also be synchronized (i.e. set to 'battery fully charged')
manually if required. This can be achieved in normal operating mode by
holding the + and – buttons simultaneously for 3 seconds, or in setup
mode by using the SYNC option (see section 4.2.1, setting number 10).
If the BMV does not synchronize automatically, the charged voltage, tail
current, and/or charged time may need adjustment.
When the voltage supply to the BMV has been interrupted, the battery
monitor must be resynchronized before it can operate correctly
John R
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