I have no idea why it started so high on a 12v system. As long as you can adjust it thats ok though.
So Victron batteries?
I have tested the theory of keeping batteries voltage limited. It doesn’t go well. It is ok for a short period such as for troubleshooting cell high voltages, but extended time no. You end up with greater issues.
The thought on keeping the cells between 20% and 80% stems from a misunderstanding of cell voltage range use. The epitomy of the saying ‘a little bit of knowlege is dangerous.’
The bms already give a range in the cells that is the useable range. So not need tonthink about it.
Energy in and out of a battery ages it.
Calendar time aging ages it (so use it or lose it anyway)
You shouldn’t keep them at one voltage either (which is why there is a bit of a difference between float and absorption) on many. And the manufacturers who use one value for both want you to cycle them.
Not balancing the pack causes problems in the battery cells. I have a friend who has been doing evil things to a battery and this is definitely the worst one to do to a pack. (It is in rehab right now but it is not looking good for recovery).
If anything set the reabsorption times longer. But i wouldn’t personally cap voltage for ‘storage purposes’. And really what the manufacturer recommends is the vest course of action. At the end of the day if you do end up with a problem, it is their problem since you followed recommended charging not because of something you may have done.