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Can anyone please clarify what the expected absorption behaviour is when set this way?
Will this result in getting 4 hours of absorption time unless current drops to 3 amps with voltage at set absorption voltage?
I have read through many posts, many are getting old and changes in firmware may have occurred.
The manual really does not explain how fixed absorption works with tail current - can tail current setting cut the fixed absorption time short?
From manual:
It is possible to override the default absorption time algorithm
by setting a fixed absorption time when programming the solar
charge controller. Be aware this can result in overcharging your
batteries. Please see your battery manufacturer for
recommended settings.
4. Absorption time determined by tail current
In some applications it may be preferable to terminate
absorption time based on tail current only. This can be
achieved by increasing the default absorption time multiplier.
Hi @Lehrling
The Tail will take effect, and override either the Fixed or Adaptive settings. You can turn it off by setting to zero Amps.
I haven't gone back over the firmware changelogs, but the manual may also have changed from the exerpts you've quoted. I found this, which seems to explain it: (edit: revised link): https://www.victronenergy.com/upload/documents/MPPT_Solar_Charge_Controllers/VictronConnect_-_MPPT_Solar_Charge_Controllers-en.pdf See Section 4.1
I use Adaptive and Tail, and the Tail wins every time. My Tail passed on from a Smartshunt, and gives a great result when the mppt is covering loads as well as charging.
"The Tail will take effect, and override either the Fixed or Adaptive settings. You can turn it off by setting to zero Amps."
Is there room in the manual for this simple and excellent explanation?
The link you provided does not work unfortunately.
Thank you.
Link fixed. Seems clear enough, but doesn't mention Tail under Adaptive. But there may be alternative circumstances where my observations mightn't apply (but I can't think of any).
And no matter what the manual sez, I always test this type of thing myself when making such changes.
Thank you, the link to the VictronConnect manual is exactly what I needed, it does explain it perfectly.
From VictronConnect manual:
When the charge current decreases below the Tail current and/or the pre-set Absorption time has elapsed, the battery is fully charged. The Controller switches to the Float stage.
Tail current
Set the current threshold that will be used to finish absorption phase before the maximum absorption time expires. When the battery current gets below the tail current for one minute, the absorption phase will end. This setting can be disabled by setting it to zero.
